Switching between singular points and exceptional-point-enhanced sensing in non-Hermitian photonic structures

Georgios Veronis; Yin Huang; Lanyan Wang; Yuecheng Shen

doi:10.1117/12.2594327

1 August 2021 Switching between singular points and exceptional-point-enhanced sensing in non-Hermitian photonic structures

Georgios Veronis, Yin Huang, Lanyan Wang, Yuecheng Shen

Author Affiliations +

Proceedings Volume 11796, Active Photonic Platforms XIII; 1179618 (2021) https://doi.org/10.1117/12.2594327
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States

Abstract

We investigate the exceptional points in a two-layer cylindrical waveguide structure consisting of absorbing and nonabsorbing dielectrics. We show that by tuning the parameters of the structure the complex effective indices of two waveguide modes can coalesce so that an exceptional point is formed. We show that the sensitivity of the effective index of the waveguide mode is enhanced at the exceptional point. We also investigate using phase-change materials in multilayer structures to switch between singular points. We show that in multilayer structures consisting of phasechange, lossless dielectric, lossy, and gain materials, absorbing or spectral singularities can be switched to exceptional points, and self-dual spectral singularities can be switched to unidirectional spectral singularities by switching the phasechange material from its crystalline to its amorphous phase. Our results could be important for developing new compact reconfigurable singularity-enhanced optical devices.

Conference Presentation

Citation Download Citation

Georgios Veronis, Yin Huang, Lanyan Wang, and Yuecheng Shen "Switching between singular points and exceptional-point-enhanced sensing in non-Hermitian photonic structures", Proc. SPIE 11796, Active Photonic Platforms XIII, 1179618 (1 August 2021); https://doi.org/10.1117/12.2594327

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