期刊
NANO LETTERS
卷 20, 期 9, 页码 6351-6356出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c01752
关键词
Bound states in the continuum plasmonic metasurface; high-Q resonances; anisotropy
类别
资金
- Australian Research Council
- Strategic Fund of the Australian National University
- Russian Foundation for Basic Research [18-32-20205]
- Russian Federation [MK-2224.2020.2]
- Australia Research Council [DP190103186]
- Foundation for the Advancement of Theoretical Physics and Mathematics BASIS
- Natural Science Foundation of Guangdong Province [2020A1515010786]
- China Scholarship Council [201808440576]
- Youth Scholar's Scientific Research Foundation of South China Normal University [17KJ12]
The concept of optical bound states in the continuum (BICs) currently drives the field of dielectric resonant nanophotonics, providing an important physical mechanism for engineering high-quality (high-Q) optical resonances in high-index dielectric nanoparticles and structured dielectric metasurfaces. For structured metallic metasurfaces, realization of BICs remains a challenge associated with strong dissipative losses of plasmonic materials. Here, we suggest and realize experimentally anisotropic plasmonic metasurfaces supporting high-Q resonances governed by quasi-BIC collective resonant modes. Our metasurfaces are composed of arrays of vertically oriented double-pillar meta-molecules covered by a thin layer of gold. We engineer quasi-BIC modes and observe experimentally sharp resonances in mid-IR reflectance spectra. Our work suggests a direct route to boost the resonant field enhancement in plasmonic metasurfaces via combining a small effective mode volume of plasmonic systems with engineered high-Q resonances provided by the BIC physics, with multiple applications to enhance light-matter interaction for nano-optics and quantum photonics.
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