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提出了一种分离的导模共振滤波器.该结构由光栅层和两个被空气薄层隔开的平板介质波导组成.使用时域有限差分法分析了该光栅结构在不同的结构参数下的光谱特性.研究表明,当TM偏振入射时改变空气薄层的厚度可以实现共振波长的可调谐,并且共振波长几乎随着空气薄层厚度线性变化.浅调制光栅被用于实现窄线宽特性.波长可调谐范围为1 515~1 558nm,半高全宽小于0.6nm.
A separate guided-mode resonant filter is proposed, which consists of a grating layer and two slab dielectric waveguides separated by an air thin layer.The finite-difference time-domain method is used to analyze the grating structure under different structural parameters Spectral Properties Studies have shown that resonant wavelength tunability can be achieved by changing the thickness of the thin air layer when TM polarization is incident, and that the resonant wavelength varies linearly with the air sheet thickness, and shallow modulation gratings are used to achieve narrow linewidth characteristics. Wavelength tunable range of 1 515 ~ 1 558nm, full width at half maximum less than 0.6nm.