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Achieving an ultra-narrow multiband light absorption meta-surface via coupling with an optical cavity

机译：通过与光学腔耦合实现超窄多波段光吸收超表面

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摘要

Resonant plasmonic and metamaterial absorbers are of particular interest for applications in a wide variety of nanotechnologies including thermophotovoltaics, photothermal therapy, hot-electron collection and biosensing. However, it is rather challenging to realize ultra-narrow absorbers using plasmonic materials due to large optical losses in metals that inevitably decrease the quality of optical resonators. Here, we theoretically report methods to achieve an ultra-narrow light absorption meta-surface by using photonic modes of the optical cavities, which strongly couple with the plasmon resonances of the metallic nanostructures. Multispectral light absorption with absorption amplitude exceeding 99% and a bandwidth approaching 10 nm is achieved at the optical frequencies. Moreover, by introducing a thick dielectric coupling cavity, the number of absorption bands can be strongly increased and the bandwidth can even be narrowed to less than 5 nm due to the resonant spectrum splitting enabled by strong coupling between the plasmon resonances and the optical cavity modes. Designing such optical cavity-coupled meta-surface structures is a promising route for achieving ultra-narrow multiband absorbers, which can be used in absorption filters, narrow-band multispectral thermal emitters and thermophotovoltaics.
机译：共振等离子体激元和超材料吸收剂特别适用于包括热光电，光热疗法，热电子收集和生物传感在内的各种纳米技术。但是，由于金属中的大量光学损失不可避免地降低了光学谐振器的质量，因此使用等离激元材料实现超窄吸收体是相当具有挑战性的。在这里，我们从理论上报告了通过使用光腔的光子模式来实现超窄光吸收超表面的方法，这些光子模式与金属纳米结构的等离子体激元共振强烈耦合。在光频率处实现了吸收幅度超过99％且带宽接近10 nm的多光谱光吸收。而且，通过引入厚的介电耦合腔，由于等离激元共振和光腔模之间的强耦合而引起的共振频谱分裂，吸收带的数量可以大大增加，带宽甚至可以缩小到小于5 nm。 。设计这种光腔耦合的超表面结构是实现超窄多波段吸收体的有前途的途径，该超窄带吸收体可用于吸收滤光片，窄带多光谱热发射器和热光电。

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