@article{12908,
  author       = {{Hammer, Manfred and Ebers, Lena and Förstner, Jens}},
  issn         = {{0740-3224}},
  journal      = {{Journal of the Optical Society of America B}},
  keywords     = {{tet_topic_waveguides}},
  pages        = {{2395}},
  title        = {{{Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating}}},
  doi          = {{10.1364/josab.36.002395}},
  volume       = {{36}},
  year         = {{2019}},
}

@article{12919,
  author       = {{Georgi, Philip and Massaro, Marcello and Luo, Kai Hong and Sain, Basudeb and Montaut, Nicola and Herrmann, Harald and Weiss, Thomas and Li, Guixin and Silberhorn, Christine and Zentgraf, Thomas}},
  issn         = {{2047-7538}},
  journal      = {{Light: Science & Applications}},
  pages        = {{70}},
  title        = {{{Metasurface interferometry toward quantum sensors}}},
  doi          = {{10.1038/s41377-019-0182-6}},
  volume       = {{8}},
  year         = {{2019}},
}

@article{12930,
  author       = {{Köthemann, Ronja and Weber, Nils and Lindner, Jörg K N and Meier, Cedrik}},
  issn         = {{0268-1242}},
  journal      = {{Semiconductor Science and Technology}},
  number       = {{9}},
  title        = {{{High-precision determination of silicon nanocrystals: optical spectroscopy versus electron microscopy}}},
  doi          = {{10.1088/1361-6641/ab3536}},
  volume       = {{34}},
  year         = {{2019}},
}

@article{14990,
  abstract     = {{We investigate optical microresonators consisting of either one or two coupled rectangular strips between upper and lower slab waveguides. The cavities are evanescently excited under oblique angles by thin-film guided, in-plane unguided waves supported by one of the slab waveguides. Beyond a specific incidence angle, losses are fully suppressed. The interaction between the guided mode of the cavity-strip and the incoming slab modes leads to resonant behavior for specific incidence angles and gaps. For a single cavity, at resonance, the input power is equally split among each of the four output ports, while for two cavities an add-drop filter can be realized that, at resonance, routes the incoming power completely to the forward drop waveguide via the cavity. For both applications, the strength of the interaction is controlled by the gaps between cavities and waveguides.}},
  author       = {{Ebers, Lena and Hammer, Manfred and Berkemeier, Manuel B. and Menzel, Alexander and Förstner, Jens}},
  issn         = {{2578-7519}},
  journal      = {{OSA Continuum}},
  keywords     = {{tet_topic_waveguides}},
  pages        = {{3288}},
  title        = {{{Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter}}},
  doi          = {{10.1364/osac.2.003288}},
  volume       = {{2}},
  year         = {{2019}},
}

@misc{7720,
  abstract     = {{Die Erfindung betrifft einen optischen Übergang zwischen zwei optischen Schichtwellenleitern. Dazu ist eine Anordnung vorgesehen aus einem ersten optischen Schichtwellenleiter (2) und einem zweiten optischen Schichtwellenleiter (3), wobei der erste optische Schichtwellenleiter (2) und der zweite optische Schichtwellenleiter (3) voneinander verschiedene über ihre jeweilige Länge konstante Dicken (d, r) aufweisen, der erste optische Schichtwellenleiter (2) mit dem zweiten optischen Schichtwellenleiter (3) mittels einer optischen Schichtwellenleiterstruktur (4) verbunden ist, die über ihre gesamte Länge (w) eine Dicke (h) aufweist, die zwischen der Dicke (d) des ersten optischen Schichtwellenleiters (2) und der Dicke (r) des zweiten optischen Schichtwellenleiters (3) liegt. Erfindungsgemäß ist die Dicke (h) der optischen Schichtwellenleiterstruktur (4) über die gesamte Länge (w) der optischen Schichtwellenleiterstruktur (4) konstant. Damit wird eine Möglichkeit für einen effizienten und mit geringen Verlusten behafteten Übergang zwischen zwei optischen Schichtwellenleitern mit unterschiedlicher Dicke bereitgestellt. }},
  author       = {{Hammer, Manfred and Förstner, Jens and Ebers, Lena}},
  keywords     = {{tet_topic_waveguides}},
  pages        = {{9}},
  title        = {{{Optical transition between two optical waveguides layer and method for transmitting light}}},
  year         = {{2019}},
}

@article{13282,
  author       = {{Lin, Zemeng and Huang, Lingling and Xu, Zhen Tao and Li, Xiaowei and Zentgraf, Thomas and Wang, Yongtian}},
  issn         = {{2195-1071}},
  journal      = {{Advanced Optical Materials}},
  number       = {{21}},
  pages        = {{1900782}},
  title        = {{{Four‐Wave Mixing Holographic Multiplexing Based on Nonlinear Metasurfaces}}},
  doi          = {{10.1002/adom.201900782}},
  volume       = {{7}},
  year         = {{2019}},
}

@article{3740,
  abstract     = {{Oblique propagation of semi-guided waves across slab waveguide structures with bent corners is investigated. A critical angle can be defined beyond which all radiation losses are suppressed. Additionally an increase of the curvature radius of the bends also leads to low-loss configurations for incidence angles below that critical angle. A combination of two bent corner systems represents a step-like structure, behaving like a Fabry-Perot interferometer, with two partial reflectors separated by the vertical height between the horizontal slabs. We numerically analyse typical high-index-contrast Si/SiO2 structures for their reflectance and transmittance properties. When increasing the curvature radius the resonant effect becomes less relevant such that full transmittance is reached with less critical conditions on the vertical distance or the incidence angle. For practical interest 3-D problems are considered, where the structures are excited by the fundamental mode of a wide, shallow rib waveguide. High transmittance levels can be observed also for these 3-D configurations depending on the width of the rib.}},
  author       = {{Ebers, Lena and Hammer, Manfred and Förstner, Jens}},
  journal      = {{Optics Express}},
  keywords     = {{tet_topic_waveguide}},
  number       = {{14}},
  pages        = {{18621--18632}},
  publisher    = {{OSA Publishing}},
  title        = {{{Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges}}},
  doi          = {{10.1364/OE.26.018621}},
  volume       = {{26}},
  year         = {{2018}},
}

@inproceedings{4579,
  abstract     = {{Semi-guided waves confined in dielectric slab waveguides are being considered for oblique angles of propagation. If the waves encounter a linear discontinuity of (mostly) arbitrary shape and extension, a variant of Snell's law applies, separately for each pair of incoming and outgoing modes. Depending on the effective indices involved, and on the angle of incidence, power transfer to specific outgoing waves can be allowed or forbidden. In particular, critical angles of incidence can be identified, beyond which any power transfer to non-guided waves is forbidden, i.e. all radiative losses are suppressed. In that case the input power is carried away from the discontinuity exclusively by reflected semi-guided waves in the input slab, or by semi-guided waves that are transmitted into other outgoing slab waveguides. Vectorial equations on a 2-D cross sectional domain apply. These are formally identical to the equations that govern the eigenmodes of 3-D channel waveguides. Here, however, these need to be solved not as an eigenvalue problem, but as an inhomogeneous problem with a right-hand-side that is given by the incoming semi-guided wave, and subject to transparent boundary conditions. The equations resemble a standard 2-D Helmholtz problem, with an effective permittivity in place of the actual relative permittivity. Depending on the properties of the incoming wave, including the angle of incidence, this effective permittivity can become locally negative, causing the suppression of propagating outgoing waves. A series of high-contrast example configurations are discussed, where these effects lead to - in some respects - quite surprising transmission characteristics.}},
  author       = {{Hammer, Manfred and Ebers, Lena and Hildebrandt, Andre and Alhaddad, Samer and Förstner, Jens}},
  booktitle    = {{2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)}},
  isbn         = {{9781538654385}},
  keywords     = {{tet_topic_waveguides}},
  publisher    = {{IEEE}},
  title        = {{{Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity}}},
  doi          = {{10.1109/mmet.2018.8460455}},
  year         = {{2018}},
}

@article{4165,
  abstract     = {{Metal nanoparticles host localized plasmon excitations that allow the manipulation of optical fields at the nanoscale. Despite the availability of several techniques for imaging plasmons, direct access into the symmetries of these excitations remains elusive, thus hindering progress in the development of applications. Here, we present a combination of angle-, polarization-, and space-resolved cathodoluminescence spectroscopy methods to selectively access the symmetry and degeneracy of plasmonic states in lithographically fabricated gold nanoprisms. We experimentally reveal and spatially map degenerate states of multipole plasmon modes with nanometer spatial resolution and further provide recipes for resolving optically dark and out-of-plane modes. Full-wave simulations in conjunction with a simple tight-binding model explain the complex plasmon structure in these particles and reveal intriguing mode-symmetry phenomena. Our approach introduces systematics for a comprehensive symmetry characterization of plasmonic states in high-symmetry nanostructures.}},
  author       = {{Myroshnychenko, Viktor and Nishio, Natsuki and García de Abajo, F. Javier and Förstner, Jens and Yamamoto, Naoki}},
  issn         = {{1936-0851}},
  journal      = {{ACS Nano}},
  keywords     = {{tet_topic_plasmonics}},
  number       = {{8}},
  pages        = {{8436--8446}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution}}},
  doi          = {{10.1021/acsnano.8b03926}},
  volume       = {{12}},
  year         = {{2018}},
}

@article{4342,
  author       = {{Chen, Shumei and Rahmani, Mohsen and Li, King Fai and Miroshnichenko, Andrey and Zentgraf, Thomas and Li, Guixin and Neshev, Dragomir and Zhang, Shuang}},
  issn         = {{2330-4022}},
  journal      = {{ACS Photonics}},
  number       = {{5}},
  pages        = {{1671--1675}},
  publisher    = {{American Chemical Society (ACS)}},
  title        = {{{Third Harmonic Generation Enhanced by Multipolar Interference in Complementary Silicon Metasurfaces}}},
  doi          = {{10.1021/acsphotonics.7b01423}},
  volume       = {{5}},
  year         = {{2018}},
}

@article{1327,
  author       = {{Weber, N. and Hoffmann, S. P. and Albert, M. and Zentgraf, Thomas and Meier, Cedrik}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  number       = {{10}},
  publisher    = {{AIP Publishing}},
  title        = {{{Efficient frequency conversion by combined photonic–plasmonic mode coupling}}},
  doi          = {{10.1063/1.5017010}},
  volume       = {{123}},
  year         = {{2018}},
}