Han Yunxin, Yang Junbo, He Xin, Huang Jie, Zhang Jingjing, Chen Dingbo, Zhang Zhaojian
Opt Express. 2019 Mar 4;27(5):7712-7718. doi: 10.1364/OE.27.007712.
We numerically study a dielectric coupled guided-mode resonant (GMR) system, which includes two silicon (Si) grating waveguide layers (GWLs) stacked on CaF substrates. It is confirmed that the coupling between the top and bottom GMR modes starts once a Fabry-Perot (F-P) resonator is introduced, and electromagnetically induced transparency (EIT)-like spectral responses occur in the coupled GMR systems. A very narrow transparency window with a high-quality (Q) factor EIT-like effect of up to 288,892 was demonstrated. Furthermore, EIT-like response wavelengths can be flexibly designed in wide wavelength range by modifying either the GMR resonance frequencies or the space between two GWLs. Therefore, this EIT-like response in coupled GMR systems would pave the way towards novel sensors with extremely high sensitivity.
我们对一种介质耦合导模共振（GMR）系统进行了数值研究，该系统包括堆叠在CaF衬底上的两个硅（Si）光栅波导层（GWL）。研究证实，一旦引入法布里 - 珀罗（F - P）谐振器，顶部和底部GMR模式之间就会开始耦合，并且在耦合GMR系统中会出现类似电磁诱导透明（EIT）的光谱响应。展示了一个非常窄的透明窗口，其具有高达288,892的高品质（Q）因子类似EIT的效应。此外，通过修改GMR共振频率或两个GWL之间的间距，可以在很宽的波长范围内灵活设计类似EIT的响应波长。因此，耦合GMR系统中的这种类似EIT的响应将为具有极高灵敏度的新型传感器铺平道路。
