Naesby Andreas, Dantan Aurélien
Opt Express. 2018 Nov 12;26(23):29886-29894. doi: 10.1364/OE.26.029886.
We investigate the optical properties of microcavities with suspended subwavelength structured mirrors, such as high-contrast gratings or two-dimensional photonic crystals slabs, and focus in particular on the regime in which the microcavity free-spectral range is larger than the width of a Fano resonance of the highly reflecting structured mirror. In this unusual regime, the transmission spectrum of the microcavity essentially consists in a single mode, whose linewidth can be significantly narrower than both the Fano resonance linewidth and the linewidth of an equally short cavity without structured mirror. This generic interference effect-occuring in any Fabry-Perot resonator with a strongly wavelength-dependent mirror-can be exploited for realizing small modevolume and high quality factor microcavities and, if high mechanical quality suspended structured thin films are used, for optomechanics and optical sensing applications.
我们研究了带有悬浮亚波长结构镜（如高对比度光栅或二维光子晶体平板）的微腔的光学特性，特别关注微腔自由光谱范围大于高反射结构镜的法诺共振宽度的情况。在这种不寻常的情况下，微腔的透射光谱基本上由单一模式组成，其线宽可比法诺共振线宽以及没有结构镜的同等短腔的线宽都要窄得多。这种在任何具有强烈波长依赖性镜的法布里 - 珀罗谐振器中都会出现的一般干涉效应，可用于实现小模式体积和高品质因数的微腔，并且，如果使用高机械品质的悬浮结构薄膜，还可用于光机械和光学传感应用。
