--- _id: '43018' article_number: '108557' author: - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko citation: ama: Alhaddad S, Förstner J, Grynko Y. Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. Journal of Quantitative Spectroscopy and Radiative Transfer. 2023;302. doi:10.1016/j.jqsrt.2023.108557 apa: Alhaddad, S., Förstner, J., & Grynko, Y. (2023). Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. Journal of Quantitative Spectroscopy and Radiative Transfer, 302, Article 108557. https://doi.org/10.1016/j.jqsrt.2023.108557 bibtex: '@article{Alhaddad_Förstner_Grynko_2023, title={Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength}, volume={302}, DOI={10.1016/j.jqsrt.2023.108557}, number={108557}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, publisher={Elsevier BV}, author={Alhaddad, Samer and Förstner, Jens and Grynko, Yevgen}, year={2023} }' chicago: Alhaddad, Samer, Jens Förstner, and Yevgen Grynko. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023). https://doi.org/10.1016/j.jqsrt.2023.108557. ieee: 'S. Alhaddad, J. Förstner, and Y. Grynko, “Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 302, Art. no. 108557, 2023, doi: 10.1016/j.jqsrt.2023.108557.' mla: Alhaddad, Samer, et al. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 302, 108557, Elsevier BV, 2023, doi:10.1016/j.jqsrt.2023.108557. short: S. Alhaddad, J. Förstner, Y. Grynko, Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023). date_created: 2023-03-14T12:32:54Z date_updated: 2023-03-15T17:36:13Z ddc: - '530' department: - _id: '61' doi: 10.1016/j.jqsrt.2023.108557 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2023-03-15T15:58:15Z date_updated: 2023-03-15T15:58:15Z file_id: '43028' file_name: 2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength.pdf file_size: 1508833 relation: main_file - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-03-15T17:35:29Z date_updated: 2023-03-15T17:35:29Z file_id: '43029' file_name: 2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength (accepted manuscript).pdf file_size: 4254386 relation: main_file file_date_updated: 2023-03-15T17:35:29Z has_accepted_license: '1' intvolume: ' 302' keyword: - tet_topic_scattering language: - iso: eng oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published publisher: Elsevier BV status: public title: Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength type: journal_article user_id: '158' volume: 302 year: '2023' ... --- _id: '29075' abstract: - lang: eng text: We study a double-scattering coherent mechanism of negative polarization (NP) near opposition that is observed for powder-like surfaces. The problem is solved numerically for absorbing structures with irregular constituents, cubes, spheres, and ellipsoids larger than the wavelength of incident light. Our simulations show that double scattering between two random irregular particles shows weak NP. Adding one more particle significantly increases the relative contribution of double scattering which enhances NP. Simulations with regular shapes and controlled geometric parameters show that the interference mechanism is sensitive to the geometry of the scattering system and can also result in no polarization or even strong enhancement of positive polarization at backscattering. author: - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Alhaddad S, Grynko Y, Farheen H, Förstner J. Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles. Optics Letters. 2022;47(1):58. doi:10.1364/ol.444953 apa: Alhaddad, S., Grynko, Y., Farheen, H., & Förstner, J. (2022). Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles. Optics Letters, 47(1), 58. https://doi.org/10.1364/ol.444953 bibtex: '@article{Alhaddad_Grynko_Farheen_Förstner_2022, title={Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles}, volume={47}, DOI={10.1364/ol.444953}, number={1}, journal={Optics Letters}, author={Alhaddad, Samer and Grynko, Yevgen and Farheen, Henna and Förstner, Jens}, year={2022}, pages={58} }' chicago: 'Alhaddad, Samer, Yevgen Grynko, Henna Farheen, and Jens Förstner. “Numerical Analysis of the Coherent Mechanism Producing Negative Polarization at Backscattering from Systems of Absorbing Particles.” Optics Letters 47, no. 1 (2022): 58. https://doi.org/10.1364/ol.444953.' ieee: 'S. Alhaddad, Y. Grynko, H. Farheen, and J. Förstner, “Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles,” Optics Letters, vol. 47, no. 1, p. 58, 2022, doi: 10.1364/ol.444953.' mla: Alhaddad, Samer, et al. “Numerical Analysis of the Coherent Mechanism Producing Negative Polarization at Backscattering from Systems of Absorbing Particles.” Optics Letters, vol. 47, no. 1, 2022, p. 58, doi:10.1364/ol.444953. short: S. Alhaddad, Y. Grynko, H. Farheen, J. Förstner, Optics Letters 47 (2022) 58. date_created: 2021-12-21T13:49:29Z date_updated: 2022-01-06T06:58:46Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/ol.444953 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2021-12-21T13:53:47Z date_updated: 2021-12-21T13:53:47Z embargo: 2022-12-21 embargo_to: open_access file_id: '29076' file_name: 2022-01 Alhaddad - Optics Letter - Double Scattering.pdf file_size: 3197213 relation: main_file file_date_updated: 2021-12-21T13:53:47Z has_accepted_license: '1' intvolume: ' 47' issue: '1' keyword: - tet_topic_scattering language: - iso: eng page: '58' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Optics Letters publication_identifier: issn: - 0146-9592 - 1539-4794 publication_status: published status: public title: Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles type: journal_article user_id: '158' volume: 47 year: '2022' ... --- _id: '34136' author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Light backscattering from numerical analog of planetary regoliths. In: Copernicus GmbH; 2022. doi:  10.5194/epsc2022-151' apa: Grynko, Y., Shkuratov, Y., Alhaddad, S., & Förstner, J. (2022). Light backscattering from numerical analog of planetary regoliths. 16th Europlanet Science Congress 2022, Granada, Spain. https://doi.org/  10.5194/epsc2022-151 bibtex: '@inproceedings{Grynko_Shkuratov_Alhaddad_Förstner_2022, title={Light backscattering from numerical analog of planetary regoliths}, DOI={  10.5194/epsc2022-151}, publisher={Copernicus GmbH}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, year={2022} }' chicago: Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Light Backscattering from Numerical Analog of Planetary Regoliths.” Copernicus GmbH, 2022. https://doi.org/  10.5194/epsc2022-151. ieee: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Light backscattering from numerical analog of planetary regoliths,” presented at the 16th Europlanet Science Congress 2022, Granada, Spain, 2022, doi:   10.5194/epsc2022-151.' mla: Grynko, Yevgen, et al. Light Backscattering from Numerical Analog of Planetary Regoliths. Copernicus GmbH, 2022, doi:  10.5194/epsc2022-151. short: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, in: Copernicus GmbH, 2022.' conference: end_date: 2022-09-23 location: Granada, Spain name: 16th Europlanet Science Congress 2022 start_date: 2022-09-18 date_created: 2022-11-23T12:03:29Z date_updated: 2022-11-23T12:09:03Z ddc: - '530' department: - _id: '61' - _id: '230' doi: ' 10.5194/epsc2022-151' file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2022-11-23T12:07:10Z date_updated: 2022-11-23T12:07:10Z file_id: '34137' file_name: 2022-09 Grynko - EPSC2022 conference -151-print.pdf file_size: 645190 relation: main_file file_date_updated: 2022-11-23T12:07:10Z has_accepted_license: '1' keyword: - tet_topic_scattering language: - iso: eng oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication_status: published publisher: Copernicus GmbH status: public title: Light backscattering from numerical analog of planetary regoliths type: conference_abstract user_id: '158' year: '2022' ... --- _id: '31574' abstract: - lang: eng text: We model negative polarization, which is observed for planetary regoliths at backscattering, solving a full wave problem of light scattering with a numerically exact Discontinuous Galerkin Time Domain (DGTD) method. Pieces of layers with the bulk packing density of particles close to 0.5 are used. The model particles are highly absorbing and have irregular shapes and sizes larger than the wavelength of light. This represents a realistic analog of low-albedo planetary regoliths. Our simulations confirm coherent backscattering mechanism of the origin of negative polarization. We show that angular profiles of polarization are stabilized if the number of particles in a layer piece becomes larger than ten. This allows application of our approach to the negative polarization modeling for planetary regoliths. author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Negative polarization of light at backscattering from a numerical analog of planetary regoliths. Icarus. 2022;384:115099. doi:10.1016/j.icarus.2022.115099 apa: Grynko, Y., Shkuratov, Y., Alhaddad, S., & Förstner, J. (2022). Negative polarization of light at backscattering from a numerical analog of planetary regoliths. Icarus, 384, 115099. https://doi.org/10.1016/j.icarus.2022.115099 bibtex: '@article{Grynko_Shkuratov_Alhaddad_Förstner_2022, title={Negative polarization of light at backscattering from a numerical analog of planetary regoliths}, volume={384}, DOI={10.1016/j.icarus.2022.115099}, journal={Icarus}, publisher={Elsevier BV}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, year={2022}, pages={115099} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Negative Polarization of Light at Backscattering from a Numerical Analog of Planetary Regoliths.” Icarus 384 (2022): 115099. https://doi.org/10.1016/j.icarus.2022.115099.' ieee: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Negative polarization of light at backscattering from a numerical analog of planetary regoliths,” Icarus, vol. 384, p. 115099, 2022, doi: 10.1016/j.icarus.2022.115099.' mla: Grynko, Yevgen, et al. “Negative Polarization of Light at Backscattering from a Numerical Analog of Planetary Regoliths.” Icarus, vol. 384, Elsevier BV, 2022, p. 115099, doi:10.1016/j.icarus.2022.115099. short: Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, Icarus 384 (2022) 115099. date_created: 2022-06-01T18:53:35Z date_updated: 2022-06-01T18:57:51Z ddc: - '530' department: - _id: '61' doi: 10.1016/j.icarus.2022.115099 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2022-06-01T18:56:44Z date_updated: 2022-06-01T18:56:44Z file_id: '31575' file_name: 2022-06 Grynko - Icarus - Negative polarization of light at backscattering from a numerical analog of planetary regoliths.pdf file_size: 1419286 relation: main_file file_date_updated: 2022-06-01T18:56:44Z has_accepted_license: '1' intvolume: ' 384' keyword: - tet_topic_scattering language: - iso: eng oa: '1' page: '115099' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Icarus publication_identifier: issn: - 0019-1035 publication_status: published publisher: Elsevier BV status: public title: Negative polarization of light at backscattering from a numerical analog of planetary regoliths type: journal_article user_id: '158' volume: 384 year: '2022' ... --- _id: '33466' abstract: - lang: eng text: 'We review our results of numerical simulations of light scattering from different systems of densely packed irregular particles. We consider spherical clusters, thick layers and monolayers with realistic topologies and dimensions much larger than the wavelength of light. The maximum bulk packing density of clusters is 0.5. A numerically exact solution of the electromagnetic problem is obtained using the Discontinuous Galerkin Time Domain method and with application of high- performance computing. We show that high packing density causes light localization in such structures which makes an impact on the opposition phenomena: backscattering intensity surge and negative linear polarization feature. Diffuse multiple scattering is significantly reduced in the case of non-absorbing particles and near-field interaction results in a percolation-like light transport determined by the topology of the medium. With this the negative polarization feature caused by single scattering gets enhanced if compared to lower density samples. We also confirm coherent double scattering mechanism of negative polarization for light scattered from dense absorbing slabs. In this case convergent result for the scattering angle polarization dependency at backscattering can be obtained for a layer of just a few tens of particles if they are larger than the wavelength.' author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Light Scattering by Large Densely Packed Clusters of Particles. In: Kokhanovsky A, ed. Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media. Vol 8. Springer Series in Light Scattering. Springer International Publishing; 2022. doi:10.1007/978-3-031-10298-1_4' apa: 'Grynko, Y., Shkuratov, Y., Alhaddad, S., & Förstner, J. (2022). Light Scattering by Large Densely Packed Clusters of Particles. In A. Kokhanovsky (Ed.), Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media (Vol. 8). Springer International Publishing. https://doi.org/10.1007/978-3-031-10298-1_4' bibtex: '@inbook{Grynko_Shkuratov_Alhaddad_Förstner_2022, place={Cham}, series={Springer Series in Light Scattering}, title={Light Scattering by Large Densely Packed Clusters of Particles}, volume={8}, DOI={10.1007/978-3-031-10298-1_4}, booktitle={Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media}, publisher={Springer International Publishing}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, editor={Kokhanovsky, Alexander}, year={2022}, collection={Springer Series in Light Scattering} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Light Scattering by Large Densely Packed Clusters of Particles.” In Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, edited by Alexander Kokhanovsky, Vol. 8. Springer Series in Light Scattering. Cham: Springer International Publishing, 2022. https://doi.org/10.1007/978-3-031-10298-1_4.' ieee: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Light Scattering by Large Densely Packed Clusters of Particles,” in Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, vol. 8, A. Kokhanovsky, Ed. Cham: Springer International Publishing, 2022.' mla: 'Grynko, Yevgen, et al. “Light Scattering by Large Densely Packed Clusters of Particles.” Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, edited by Alexander Kokhanovsky, vol. 8, Springer International Publishing, 2022, doi:10.1007/978-3-031-10298-1_4.' short: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, in: A. Kokhanovsky (Ed.), Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, Springer International Publishing, Cham, 2022.' date_created: 2022-09-22T09:18:45Z date_updated: 2023-01-11T15:28:17Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1007/978-3-031-10298-1_4 editor: - first_name: Alexander full_name: Kokhanovsky, Alexander last_name: Kokhanovsky file: - access_level: local content_type: application/pdf creator: fossie date_created: 2022-09-22T09:24:45Z date_updated: 2022-09-22T09:24:45Z file_id: '33467' file_name: 2022-09 Grynko - Book chapter on Light Scattering by Large Densely Packed Clusters of Particles.pdf file_size: 1525307 relation: main_file file_date_updated: 2022-09-22T09:24:45Z has_accepted_license: '1' intvolume: ' 8' keyword: - tet_topic_scattering language: - iso: eng main_file_link: - open_access: '1' url: https://rdcu.be/cV5GC oa: '1' place: Cham project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: 'Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media' publication_identifier: isbn: - '9783031102974' - '9783031102981' issn: - 2509-2790 - 2509-2804 publication_status: published publisher: Springer International Publishing series_title: Springer Series in Light Scattering status: public title: Light Scattering by Large Densely Packed Clusters of Particles type: book_chapter user_id: '158' volume: 8 year: '2022' ... --- _id: '17803' abstract: - lang: eng text: We numerically simulate multiple light scattering in discrete disordered media represented by large clusters of irregular non-absorbing particles. The packing density of clusters is 0.5. With such conditions diffuse scattering is significantly reduced and light transport follows propagation channels that are determined by the particle size and topology of the medium. This kind of localization produces coherent backscattering intensity surge and enhanced negative polarization branch if compared to lower density samples. author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Grynko Y, Shkuratov Y, Förstner J. Light backscattering from large clusters of densely packed irregular particles. Journal of Quantitative Spectroscopy and Radiative Transfer. 2020;255:107234. doi:10.1016/j.jqsrt.2020.107234 apa: Grynko, Y., Shkuratov, Y., & Förstner, J. (2020). Light backscattering from large clusters of densely packed irregular particles. Journal of Quantitative Spectroscopy and Radiative Transfer, 255, 107234. https://doi.org/10.1016/j.jqsrt.2020.107234 bibtex: '@article{Grynko_Shkuratov_Förstner_2020, title={Light backscattering from large clusters of densely packed irregular particles}, volume={255}, DOI={10.1016/j.jqsrt.2020.107234}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, author={Grynko, Yevgen and Shkuratov, Yuriy and Förstner, Jens}, year={2020}, pages={107234} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, and Jens Förstner. “Light Backscattering from Large Clusters of Densely Packed Irregular Particles.” Journal of Quantitative Spectroscopy and Radiative Transfer 255 (2020): 107234. https://doi.org/10.1016/j.jqsrt.2020.107234.' ieee: Y. Grynko, Y. Shkuratov, and J. Förstner, “Light backscattering from large clusters of densely packed irregular particles,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 255, p. 107234, 2020. mla: Grynko, Yevgen, et al. “Light Backscattering from Large Clusters of Densely Packed Irregular Particles.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 255, 2020, p. 107234, doi:10.1016/j.jqsrt.2020.107234. short: Y. Grynko, Y. Shkuratov, J. Förstner, Journal of Quantitative Spectroscopy and Radiative Transfer 255 (2020) 107234. date_created: 2020-08-11T09:07:04Z date_updated: 2022-01-06T06:53:20Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1016/j.jqsrt.2020.107234 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2020-08-11T15:24:31Z date_updated: 2020-08-11T15:24:31Z file_id: '17814' file_name: 2020-08 Grynko - JQSRT PREPRINT - Large Cluster.pdf file_size: 1567605 relation: main_file title: Preprint file_date_updated: 2020-08-11T15:24:31Z has_accepted_license: '1' intvolume: ' 255' keyword: - tet_topic_scattering language: - iso: eng oa: '1' page: '107234' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published status: public title: Light backscattering from large clusters of densely packed irregular particles type: journal_article user_id: '158' volume: 255 year: '2020' ... --- _id: '8872' abstract: - lang: eng text: We consider light scattering from a new type of model particle whose shape is represented in the form of a generalized ellipsoid having N foci, where N is greater than two. Such particles can be convex as well as concave. We use the geometrical optics approximation to study the light scattering from 3-foci particles. Non-zero elements of the scattering matrix are calculated for ensembles of randomly oriented independent transparent particles, m = n + i0. Several internal reflection orders are considered separately. It was found that the transmission-transmission (TT) and transmission-reflectance-transmission (TRT) components dominate in the formation of intensity of scattered light at large and small phase angles, respectively. We found a significant role of the total internal reflections of the TRT in the middle portion of the phase angle range. The main factors in the formation of positive linear polarization are the R and TRT component. The TT component is responsible for the formation of negative polarization branch at large phase angles. author: - first_name: Dmitriy full_name: Stankevich, Dmitriy last_name: Stankevich - first_name: Larissa full_name: Hradyska, Larissa last_name: Hradyska - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Gorden full_name: Videen, Gorden last_name: Videen - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Stankevich D, Hradyska L, Shkuratov Y, Grynko Y, Videen G, Förstner J. Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation. Journal of Quantitative Spectroscopy and Radiative Transfer. 2019;231:49. doi:10.1016/j.jqsrt.2019.04.016 apa: Stankevich, D., Hradyska, L., Shkuratov, Y., Grynko, Y., Videen, G., & Förstner, J. (2019). Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation. Journal of Quantitative Spectroscopy and Radiative Transfer, 231, 49. https://doi.org/10.1016/j.jqsrt.2019.04.016 bibtex: '@article{Stankevich_Hradyska_Shkuratov_Grynko_Videen_Förstner_2019, title={Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation}, volume={231}, DOI={10.1016/j.jqsrt.2019.04.016}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, author={Stankevich, Dmitriy and Hradyska, Larissa and Shkuratov, Yuriy and Grynko, Yevgen and Videen, Gorden and Förstner, Jens}, year={2019}, pages={49} }' chicago: 'Stankevich, Dmitriy, Larissa Hradyska, Yuriy Shkuratov, Yevgen Grynko, Gorden Videen, and Jens Förstner. “Light Scattering by 3-Foci Convex and Concave Particles in the Geometrical Optics Approximation.” Journal of Quantitative Spectroscopy and Radiative Transfer 231 (2019): 49. https://doi.org/10.1016/j.jqsrt.2019.04.016.' ieee: D. Stankevich, L. Hradyska, Y. Shkuratov, Y. Grynko, G. Videen, and J. Förstner, “Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 231, p. 49, 2019. mla: Stankevich, Dmitriy, et al. “Light Scattering by 3-Foci Convex and Concave Particles in the Geometrical Optics Approximation.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 231, 2019, p. 49, doi:10.1016/j.jqsrt.2019.04.016. short: D. Stankevich, L. Hradyska, Y. Shkuratov, Y. Grynko, G. Videen, J. Förstner, Journal of Quantitative Spectroscopy and Radiative Transfer 231 (2019) 49. date_created: 2019-04-11T07:38:54Z date_updated: 2022-01-06T07:04:04Z department: - _id: '61' doi: 10.1016/j.jqsrt.2019.04.016 intvolume: ' 231' keyword: - tet_topic_scattering language: - iso: eng page: '49' publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published status: public title: Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation type: journal_article user_id: '158' volume: 231 year: '2019' ... --- _id: '4324' abstract: - lang: eng text: "We study the dependence of the intensity and linear polarization of light scattered by isolated particles with the compact\r\nirregular shape on their size using the discontinuous Galerkin time domain numerical method. The size parameter of particles varies in the range of X = 10 to 150, and the complex refractive index is m = 1.5 + 0i. Our results show\r\nthat the backscattering negative polarization branch weakens monotonously, but does not disappear at large sizes, up to the geometrical optics regime, and can be simulated without accounting for wave effects. The intensity backscattering surge becomes narrower with increasing particle size. For X = 150, the surge width is several degrees." article_type: original author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Grynko Y, Shkuratov Y, Förstner J. Intensity surge and negative polarization of light from compact irregular particles. Optics Letters. 2018;43(15):3562. doi:10.1364/ol.43.003562 apa: Grynko, Y., Shkuratov, Y., & Förstner, J. (2018). Intensity surge and negative polarization of light from compact irregular particles. Optics Letters, 43(15), 3562. https://doi.org/10.1364/ol.43.003562 bibtex: '@article{Grynko_Shkuratov_Förstner_2018, title={Intensity surge and negative polarization of light from compact irregular particles}, volume={43}, DOI={10.1364/ol.43.003562}, number={15}, journal={Optics Letters}, publisher={The Optical Society}, author={Grynko, Yevgen and Shkuratov, Yuriy and Förstner, Jens}, year={2018}, pages={3562} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, and Jens Förstner. “Intensity Surge and Negative Polarization of Light from Compact Irregular Particles.” Optics Letters 43, no. 15 (2018): 3562. https://doi.org/10.1364/ol.43.003562.' ieee: Y. Grynko, Y. Shkuratov, and J. Förstner, “Intensity surge and negative polarization of light from compact irregular particles,” Optics Letters, vol. 43, no. 15, p. 3562, 2018. mla: Grynko, Yevgen, et al. “Intensity Surge and Negative Polarization of Light from Compact Irregular Particles.” Optics Letters, vol. 43, no. 15, The Optical Society, 2018, p. 3562, doi:10.1364/ol.43.003562. short: Y. Grynko, Y. Shkuratov, J. Förstner, Optics Letters 43 (2018) 3562. date_created: 2018-08-30T10:17:08Z date_updated: 2022-01-06T07:00:55Z ddc: - '530' department: - _id: '61' doi: 10.1364/ol.43.003562 file: - access_level: open_access content_type: application/pdf creator: hclaudia date_created: 2018-08-30T10:18:10Z date_updated: 2021-07-27T21:04:54Z file_id: '4325' file_name: 2018-07 Grynko,Shkuratov,Förstner_Intensity surge and negative polarization of light from compact irregular particles.pdf file_size: 1797893 relation: main_file file_date_updated: 2021-07-27T21:04:54Z has_accepted_license: '1' intvolume: ' 43' issue: '15' keyword: - tet_topic_scattering language: - iso: eng oa: '1' page: '3562' publication: Optics Letters publication_identifier: issn: - 0146-9592 - 1539-4794 publication_status: published publisher: The Optical Society status: public title: Intensity surge and negative polarization of light from compact irregular particles type: journal_article user_id: '158' volume: 43 year: '2018' ... --- _id: '3523' abstract: - lang: eng text: We numerically simulate the circular polarization ratio of the radar signal backscattered from a large-grain cometary coma and compare the simulation results with the radar measurements for seven comets. We apply the discrete dipole approximation method and a model of random irregular particles. Our results confirm water ice composition of the cm-sized chunks detected by the NASA Deep Impact space probe in the vicinity of the nucleus of Comet 103P/Hartley 2. The index of the power-law size distribution in this case can be constrained to the range n ≈ 3.3–4.3. For the other considered comets the circular polarization ratio can be reproduced with variations of the power index between 2 and 5. article_type: original author: - first_name: Shraddha full_name: Dogra, Shraddha last_name: Dogra - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Evgenij full_name: Zubko, Evgenij last_name: Zubko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Dogra S, Grynko Y, Zubko E, Förstner J. Radar backscattering from a large-grain cometary coma: numerical simulation. Astronomy & Astrophysics. 2017;608:A20. doi:10.1051/0004-6361/201730801' apa: 'Dogra, S., Grynko, Y., Zubko, E., & Förstner, J. (2017). Radar backscattering from a large-grain cometary coma: numerical simulation. Astronomy & Astrophysics, 608, A20. https://doi.org/10.1051/0004-6361/201730801' bibtex: '@article{Dogra_Grynko_Zubko_Förstner_2017, title={Radar backscattering from a large-grain cometary coma: numerical simulation}, volume={608}, DOI={10.1051/0004-6361/201730801}, journal={Astronomy & Astrophysics}, publisher={EDP Sciences}, author={Dogra, Shraddha and Grynko, Yevgen and Zubko, Evgenij and Förstner, Jens}, year={2017}, pages={A20} }' chicago: 'Dogra, Shraddha, Yevgen Grynko, Evgenij Zubko, and Jens Förstner. “Radar Backscattering from a Large-Grain Cometary Coma: Numerical Simulation.” Astronomy & Astrophysics 608 (2017): A20. https://doi.org/10.1051/0004-6361/201730801.' ieee: 'S. Dogra, Y. Grynko, E. Zubko, and J. Förstner, “Radar backscattering from a large-grain cometary coma: numerical simulation,” Astronomy & Astrophysics, vol. 608, p. A20, 2017.' mla: 'Dogra, Shraddha, et al. “Radar Backscattering from a Large-Grain Cometary Coma: Numerical Simulation.” Astronomy & Astrophysics, vol. 608, EDP Sciences, 2017, p. A20, doi:10.1051/0004-6361/201730801.' short: S. Dogra, Y. Grynko, E. Zubko, J. Förstner, Astronomy & Astrophysics 608 (2017) A20. date_created: 2018-07-10T10:19:01Z date_updated: 2022-01-06T06:59:21Z ddc: - '530' department: - _id: '61' doi: 10.1051/0004-6361/201730801 file: - access_level: open_access content_type: application/pdf creator: hclaudia date_created: 2018-08-14T10:17:27Z date_updated: 2018-09-03T14:05:33Z file_id: '3903' file_name: 2017-10 Dogra,Grynko,Zubko,Förstner_Radar backscattering from large scale cometary coma-Numerical simulation_Astronomy and Astrophysics.pdf file_size: 1206283 relation: main_file file_date_updated: 2018-09-03T14:05:33Z has_accepted_license: '1' intvolume: ' 608' keyword: - tet_topic_scattering language: - iso: eng oa: '1' page: A20 publication: Astronomy & Astrophysics publication_identifier: issn: - 0004-6361 - 1432-0746 publication_status: published publisher: EDP Sciences status: public title: 'Radar backscattering from a large-grain cometary coma: numerical simulation' type: journal_article urn: '35230' user_id: '158' volume: 608 year: '2017' ... --- _id: '3834' abstract: - lang: eng text: 'The problem of light scattering by ice crystals of cirrus clouds is considered in the case of a hexagonal ice plate with different distributions over crystal orientations. The physical-optics approximation based on (E, M)-diffraction theory is compared with two exact numerical methods: the finite difference time domain (FDTD) and the discontinuous Galerkin time domain (DGTD) in order to estimate its accuracy and limits of applicability. It is shown that the accuracy of the physical-optics approximation is estimated as 95% for the averaged backscattering Mueller matrix for particles with size parameter more than 120. Furthermore, the simple expression that allows one to estimate the minimal number of particle orientations required for appropriate spatial averaging has been derived.' article_type: original author: - first_name: Alexander full_name: Konoshonkin, Alexander last_name: Konoshonkin - first_name: Anatoli full_name: Borovoi, Anatoli last_name: Borovoi - first_name: Natalia full_name: Kustova, Natalia last_name: Kustova - first_name: Hajime full_name: Okamoto, Hajime last_name: Okamoto - first_name: Hiroshi full_name: Ishimoto, Hiroshi last_name: Ishimoto - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Konoshonkin A, Borovoi A, Kustova N, et al. Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation. Journal of Quantitative Spectroscopy and Radiative Transfer. 2016;195:132-140. doi:10.1016/j.jqsrt.2016.12.024' apa: 'Konoshonkin, A., Borovoi, A., Kustova, N., Okamoto, H., Ishimoto, H., Grynko, Y., & Förstner, J. (2016). Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation. Journal of Quantitative Spectroscopy and Radiative Transfer, 195, 132–140. https://doi.org/10.1016/j.jqsrt.2016.12.024' bibtex: '@article{Konoshonkin_Borovoi_Kustova_Okamoto_Ishimoto_Grynko_Förstner_2016, title={Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation}, volume={195}, DOI={10.1016/j.jqsrt.2016.12.024}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, publisher={Elsevier BV}, author={Konoshonkin, Alexander and Borovoi, Anatoli and Kustova, Natalia and Okamoto, Hajime and Ishimoto, Hiroshi and Grynko, Yevgen and Förstner, Jens}, year={2016}, pages={132–140} }' chicago: 'Konoshonkin, Alexander, Anatoli Borovoi, Natalia Kustova, Hajime Okamoto, Hiroshi Ishimoto, Yevgen Grynko, and Jens Förstner. “Light Scattering by Ice Crystals of Cirrus Clouds: From Exact Numerical Methods to Physical-Optics Approximation.” Journal of Quantitative Spectroscopy and Radiative Transfer 195 (2016): 132–40. https://doi.org/10.1016/j.jqsrt.2016.12.024.' ieee: 'A. Konoshonkin et al., “Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 195, pp. 132–140, 2016.' mla: 'Konoshonkin, Alexander, et al. “Light Scattering by Ice Crystals of Cirrus Clouds: From Exact Numerical Methods to Physical-Optics Approximation.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 195, Elsevier BV, 2016, pp. 132–40, doi:10.1016/j.jqsrt.2016.12.024.' short: A. Konoshonkin, A. Borovoi, N. Kustova, H. Okamoto, H. Ishimoto, Y. Grynko, J. Förstner, Journal of Quantitative Spectroscopy and Radiative Transfer 195 (2016) 132–140. date_created: 2018-08-07T10:20:26Z date_updated: 2022-01-06T06:59:40Z ddc: - '530' department: - _id: '61' doi: 10.1016/j.jqsrt.2016.12.024 file: - access_level: closed content_type: application/pdf creator: hclaudia date_created: 2018-08-07T10:23:33Z date_updated: 2018-08-07T10:23:33Z file_id: '3835' file_name: 2017-07 Grynko_Light scattering by ice crystals of cirrus clouds From exact numerical methods to physical-optics approximation.pdf file_size: 1916248 relation: main_file success: 1 file_date_updated: 2018-08-07T10:23:33Z has_accepted_license: '1' intvolume: ' 195' keyword: - tet_topic_scattering language: - iso: eng page: 132-140 project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published publisher: Elsevier BV status: public title: 'Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation' type: journal_article user_id: '158' volume: 195 year: '2016' ...