TY - GEN
T1 - Switching between topological edge states using phase-change materials
AU - Veronis, Georgios
AU - Huang, Yin
AU - Shen, Yuecheng
N1 - Publisher Copyright:
© 2023 SPIE.
PY - 2023
Y1 - 2023
N2 - We introduce non-Hermitian plasmonic waveguide-cavity structures based on the Aubry-Andre-Harper model to realize switching between right and left topological edge states using the phase-change material germanium-antimony-tellurium (GST). The structure unit cells consist of a metal-dielectric-metal (MDM) waveguide side-coupled to MDM stub resonators with modulated distances between adjacent stubs. In such structures the modulated distances introduce an effective gauge magnetic field. We show that switching between the crystalline and amorphous phases of GST leads to a shift of the dispersion relation of the optimized structure so that a right topological edge state for the crystalline phase, and a left topological edge state for the amorphous phase occur at the same frequency. Thus, we realize switching between right and left topological edge states at that frequency by switching between the crystalline and amorphous phases of GST. Our results could be potentially important for developing compact reconfigurable topological photonic devices.
AB - We introduce non-Hermitian plasmonic waveguide-cavity structures based on the Aubry-Andre-Harper model to realize switching between right and left topological edge states using the phase-change material germanium-antimony-tellurium (GST). The structure unit cells consist of a metal-dielectric-metal (MDM) waveguide side-coupled to MDM stub resonators with modulated distances between adjacent stubs. In such structures the modulated distances introduce an effective gauge magnetic field. We show that switching between the crystalline and amorphous phases of GST leads to a shift of the dispersion relation of the optimized structure so that a right topological edge state for the crystalline phase, and a left topological edge state for the amorphous phase occur at the same frequency. Thus, we realize switching between right and left topological edge states at that frequency by switching between the crystalline and amorphous phases of GST. Our results could be potentially important for developing compact reconfigurable topological photonic devices.
KW - effective gauge magnetic field
KW - metal-dielectric-metal waveguide
KW - non-Hermitian photonic systems
KW - phase-change materials
KW - switching
KW - topological edge states
UR - https://www.scopus.com/pages/publications/85176016190
U2 - 10.1117/12.2677837
DO - 10.1117/12.2677837
M3 - 会议稿件
AN - SCOPUS:85176016190
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Active Photonic Platforms, APP 2023
A2 - Subramania, Ganapathi S.
A2 - Foteinopoulou, Stavroula
PB - SPIE
T2 - 2023 Active Photonic Platforms, APP 2023
Y2 - 20 August 2023 through 24 August 2023
ER -