Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology

J. Lu, K.G. Wirth, W. Gao, A. Heßler, B. Sain, T. Taubner, T. Zentgraf, Science Advances 7 (2021).

Journal Article | Published | English
Author
Lu, Jinlong; Wirth, Konstantin G.; Gao, Wenlong; Heßler, Andreas; Sain, Basudeb; Taubner, Thomas; Zentgraf, ThomasLibreCat
Abstract
Topological photonic crystals (TPhCs) provide robust manipulation of light with built-in immunity to fabrication tolerances and disorder. Recently, it was shown that TPhCs based on weak topology with a dislocation inherit this robustness and further host topologically protected lower-dimensional localized modes. However, TPhCs with weak topology at optical frequencies have not been demonstrated so far. Here, we use scattering-type scanning near-field optical microscopy to verify mid-bandgap zero-dimensional light localization close to 100 THz in a TPhC with nontrivial Zak phase and an edge dislocation. We show that because of the weak topology, differently extended dislocation centers induce similarly strong light localization. The experimental results are supported by full-field simulations. Along with the underlying fundamental physics, our results lay a foundation for the application of TPhCs based on weak topology in active topological nanophotonics, and nonlinear and quantum optic integrated devices because of their strong and robust light localization.
Publishing Year
Journal Title
Science Advances
Volume
7
Issue
49
Article Number
eabl3903
ISSN
LibreCat-ID

Cite this

Lu J, Wirth KG, Gao W, et al. Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology. Science Advances. 2021;7(49). doi:10.1126/sciadv.abl3903
Lu, J., Wirth, K. G., Gao, W., Heßler, A., Sain, B., Taubner, T., & Zentgraf, T. (2021). Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology. Science Advances, 7(49), Article eabl3903. https://doi.org/10.1126/sciadv.abl3903
@article{Lu_Wirth_Gao_Heßler_Sain_Taubner_Zentgraf_2021, title={Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology}, volume={7}, DOI={10.1126/sciadv.abl3903}, number={49eabl3903}, journal={Science Advances}, author={Lu, Jinlong and Wirth, Konstantin G. and Gao, Wenlong and Heßler, Andreas and Sain, Basudeb and Taubner, Thomas and Zentgraf, Thomas}, year={2021} }
Lu, Jinlong, Konstantin G. Wirth, Wenlong Gao, Andreas Heßler, Basudeb Sain, Thomas Taubner, and Thomas Zentgraf. “Observing 0D Subwavelength-Localized Modes at ~100 THz Protected by Weak Topology.” Science Advances 7, no. 49 (2021). https://doi.org/10.1126/sciadv.abl3903.
J. Lu et al., “Observing 0D subwavelength-localized modes at ~100 THz protected by weak topology,” Science Advances, vol. 7, no. 49, Art. no. eabl3903, 2021, doi: 10.1126/sciadv.abl3903.
Lu, Jinlong, et al. “Observing 0D Subwavelength-Localized Modes at ~100 THz Protected by Weak Topology.” Science Advances, vol. 7, no. 49, eabl3903, 2021, doi:10.1126/sciadv.abl3903.
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