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利用严格耦合波法设计并优化了中心波长为1.55μm,基于液晶的波长可调谐导模共振滤波器(WTGMF)。通过计算得知减反层和衬底的厚度均对滤波器的共振线宽有影响,减反层的厚度越薄共振线宽越宽,但是对于衬底厚度总存在着一个最优的厚度使线宽达到最窄,当衬底厚度为300nm时,线宽缩小到最窄的0.96nm。另外决定WTGMF的波长调谐范围的主要因素是液晶层的厚度,调谐范围随着液晶层厚度的增加而增加并最终达到稳定,当液晶层厚度达到1600nm时波长调谐范围达到最大的39nm。
A wavelength-tunable guided-mode resonance filter (WTGMF) based on liquid crystal was designed and optimized using a rigorous coupled-wave method. The calculated thickness of the anti-reflection layer and the substrate all have an influence on the resonance linewidth of the filter. The thinner the anti-reflection layer is, the wider the resonance linewidth is, but there is always an optimum thickness for the substrate thickness The line width reaches the narrowest, and when the substrate thickness is 300 nm, the line width is reduced to the narrowest 0.96 nm. In addition, the main factor that determines the wavelength tuning range of the WTGMF is the thickness of the liquid crystal layer. The tuning range increases and finally reaches a stable level as the thickness of the liquid crystal layer increases. When the thickness of the liquid crystal layer reaches 1600 nm, the wavelength tuning range reaches the maximum of 39 nm.