Russell Benjamin J, Cadusch Jasper J, Meng Jiajun, Wen Dandan, Crozier Kenneth B
Opt Lett. 2022 May 15;47(10):2490-2493. doi: 10.1364/OL.448858.
Mid-infrared (MIR) spectroscopy has numerous industrial applications and is usually performed with Fourier-transform infrared (FTIR) spectrometers. While these work well for many purposes, there is currently much interest in alternative approaches that are smaller and lighter, i.e., MIR microspectrometers. Here we investigate all-dielectric metasurfaces as spectral filters for MIR microspectrometers. Two metasurface types are studied. For the first, we design, fabricate, and test a metasurface with a narrow and angularly tunable transmission stop band. We use it to reconstruct the transmission spectra of various materials. The second metasurface, investigated theoretically, possesses narrow passband features via symmetry-protected bound states in the continuum.
中红外（MIR）光谱技术有众多工业应用，通常使用傅里叶变换红外（FTIR）光谱仪来进行。虽然这些仪器在许多方面表现良好，但目前人们对更小、更轻的替代方法，即MIR微型光谱仪，有很大兴趣。在此，我们研究全介质超表面作为MIR微型光谱仪的光谱滤波器。研究了两种超表面类型。对于第一种，我们设计、制造并测试了一种具有窄且角度可调透射阻带的超表面。我们用它来重建各种材料的透射光谱。第二种超表面是通过理论研究的，它在连续谱中具有受对称性保护的束缚态从而拥有窄通带特性。
