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导模共振是由于光栅介质内高级次子波耦合进光栅所支持的泄漏模中 ,导致传播波能量重新分布的结果 .采用严格的耦合波方法 ,通过分析波导的导波模式 ,正确估计出弱调制介质光栅导模共振的位置 .并对导模共振与光栅厚度、基底厚度以及入射角的关系作了讨论 .通过采用抗反射设计 ,获得了具有对称、低旁带特点的窄带共振峰
The guided-mode resonance results from the redistribution of the high-order second-order sub-waves into the grating supported by the grating, resulting in the redistribution of the propagating wave energy. By using a rigorous coupled-wave method, the guided wave mode of the waveguide is correctly estimated to be weak The relationship between the resonance of the guided mode and the thickness of the grating, the thickness of the substrate and the angle of incidence is discussed. By using the anti-reflection design, a narrowband formant with symmetrical and low sideband characteristics is obtained