Beijing Key Laboratory of Nanophotonics & Ultrafine Optoelectronic Systems and School of Physics, Beijing Institute of Technology, Beijing 100081, China.
Opt Lett. 2012 Dec 15;37(24):5085-7. doi: 10.1364/OL.37.005085.
We investigate optical mode tailoring in a semiconductor microcavity with a metal grating on top and a dielectric grating (DG) on the bottom. Strong coupling between microcavity and grating-diffraction modes is explained in the Fano-picture. The Fano resonance shows a weak dependence upon grating height and duty ratio, but is strong upon grating period. The microcavity transmission line shapes are "S" and anti "S"-type for the metal and DGs, respectively. Together with these two types of Fano resonances, the transmission spectra have been tailored into very sharp peaks with FWHM being up to 0.1 nm. We prove that this optical mode tailoring method is quite applicable for other waveguide-grating structures too.
我们研究了顶部带有金属光栅和底部带有介质光栅 (DG) 的半导体微腔中的光学模式调整。在 Fano 图像中解释了微腔和光栅衍射模式之间的强耦合。Fano 共振对光栅高度和占空比的依赖性较弱，但对光栅周期的依赖性较强。微腔传输线形状分别为金属和 DG 的“S”型和反“S”型。结合这两种 Fano 共振，我们将透射谱调整为非常尖锐的峰，半峰全宽可达 0.1nm。我们证明了这种光学模式调整方法也非常适用于其他波导光栅结构。
