Weak modulated dielectric grating can be equivalent to planar waveguide. When it diffracted high-order spatial sub-wave is coupled with waveguide mode, a guided mode resonance is formed.
弱调制介质光栅可等效为平板波导，经其衍射的高级次子波与波导模式耦合时，形成导模共振。
When guided mode resonance occurs, the incident wave parameters and grating parameters are very sensitive. It has a narrow-band effect and can be used to fabricate narrow-band filters.
导模共振对入射波参数和光栅参数极为敏感，具有窄带效应，可用来制作窄带滤波片。
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