Design of sub-wavelength ultra-narrow band filter
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摘要: 根据严格耦合波理论（RCWA），提出了一种基于亚波长的双导模共振（GMR）光栅透射型滤波器的结构设计，其工作原理是利用对称式双GMR光栅将电磁能量全部集中在结构的波导层中，从而产生高效的共振峰。利用两个单GMR光栅串联，光栅间分别为无空气间隙和间隔2.13μm空气层两种结构。仿真结果表明，无空气间隙的双GMR光栅串联结构可实现在波长1 550 nm处的滤波，其峰值透射率约为100%，半峰宽（FWHM）可达0.012 nm；有空气间隙双GMR光栅串联结构将GMR与法布里-珀罗共振（FPR）相结合，在共振波长1 550 nm处的峰值透射率约为100%，FWHM为0.15 nm，并获得了平顶滤波曲线，平坦度约为0.1 dB，上述两种结构滤波器可用于光信息处理与光传感等领域。Abstract: A structural design of a sub-wavelength dual guided-mode resonance (GMR) grating transmission filter was proposed on the basis of the rigorous coupled wave theory (RCWA). The fundamental concept was to use a symmetrical dual GMR grating structure to constrain all electromagnetic energy in the waveguide layer, resulting in efficient resonance peak. In addition, two double GMR grating structures were realized by cascading two single GMR grating structures with or without an air gap. The simulation results show that the filtering effect utilizing the double GMR grating structure without the air layer can be realized at 1 550 nm, whose peak transmittance is about 100% and half-value width (FWHM) can reach to 0.012 nm. The double GMR grating flat-top filter structure with the air layer of 2.13 μm, utilizing the GMR in conjunction with Fabry-Perot resonance (FPR), has a peak transmittance of about 100% at a resonance wavelength of 1 550 nm and a FWHM of 0.15 nm with the flatness of 0.1 dB. The proposed two compact and simple structures show promising potential for optical filtering and sensing applications.
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