期刊
LASER & PHOTONICS REVIEWS
卷 16, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.202100617
关键词
bound states in the continuum; exceptional points; metagrating
资金
- National Natural Science Foundation of China (NSFC) [62075084]
- National Key Research and Development Program of China [2021YFB2802003]
- Guangdong Provincial Innovation and Entrepreneurship Project [2016ZT06D081]
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010615]
- Guangzhou Science and Technology Program [202102020566]
- Simons Foundation
- Air Force Office of Scientific Research MURI program
Coupled resonances in non-Hermitian systems can be used to achieve extreme control over diffraction orders and tailor the overall spectral response, enabling control over singular features.
Coupled resonances in non-Hermitian systems can lead to exotic optical features, such as bound states in the continuum (BICs) and exceptional points (EPs), which have been recently emerged as powerful tools to control the propagation and scattering of light. Yet, similar tools to control diffraction and engineer spatial wavefronts have remained elusive. Here, it is shown that, by operating a metagrating around BICs and EPs, it is possible to achieve an extreme degree of control over coupling to different diffraction orders. Subwavelength metallic slit arrays stacked on a metal-insulator-metal waveguide, enabling a careful control of the coupling between localized and guided modes are explored. By tuning the coupling strength from weak to strong, the overall spectral response can be tailored and the emergence of singular features, like BICs and EPs can be enabled. Perfect unitary diffraction efficiency with large spectrum selectivity is achieved around these singular features, with promising applications for selective wavefront shaping, filtering, and sensing.
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