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Edge states in coupled non-Hermitian resonators
Optics Letters
|June 1, 2023
Summary
Researchers experimentally demonstrated edge states in non-Hermitian resonators. These edge states are robust against disorder, offering insights into non-Hermitian physics and potential applications in advanced optical systems.
Area of Science:
- Non-Hermitian physics
- Condensed matter physics
- Photonics
Background:
- Non-Hermitian systems exhibit unique properties sensitive to perturbations.
- The interplay between bulk and edge properties in non-Hermitian systems requires experimental validation.
Purpose of the Study:
- To experimentally demonstrate edge states in coupled non-Hermitian resonators.
- To investigate the role of asymmetric backscattering in forming edge states.
- To assess the robustness of these edge states against disorder.
Main Methods:
- Fabrication of an all-dielectric coupled resonator chain.
- Utilizing evanescent coupling between cavity and target particles.
- Experimental observation and characterization of edge states.
Main Results:
- Demonstrated the existence of edge states in the bulk bandgap of coupled non-Hermitian resonators.
- Showcased tunable asymmetric backscattering as a key mechanism for edge state formation.
- Confirmed the robustness of observed edge states against weak system disorders.
Conclusions:
- Experimental evidence for non-Hermitian edge states in coupled resonator systems.
- Highlighting the significance of asymmetric backscattering in non-Hermitian bulk-edge phenomena.
- The findings pave the way for exploring non-Hermitian properties in engineered optical systems.
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