A waveguide grating on a transparent substrate can serve as an optical notch filter owing to guided-mode resonance. The filtering wavelength is highly sensitive to an incidence angle. Potential of a two-dimensional grating for an application to three-dimensional angle-fluctuation sensing was investigated. Spectral variations due to the angle fluctuations were theoretically discussed and simulated using the rigorous coupled wave analysis. Incidence and azimuth angles (θ, ψ) are measured from resonance wavelengths while a polarization angle φ is detected from a ratio in transmittance at the resonance wavelengths. Sensitivities by a designed example were estimated to be 5 and 10 nm/° and 0.3 dB/° for θ, ψ, and φ, respectively.

由于导模共振，透明基板上的波导光栅可以用作光学陷波滤波器。过滤波长对入射角高度敏感。研究了二维光栅应用于三维角度波动传感的潜力。使用严格的耦合波分析从理论上讨论和模拟由于角度波动引起的光谱变化。入射角和方位角 ( θ , ψ ) 是根据共振波长测量的，而偏振角φ是根据共振波长处的透射率比率来检测的。通过所设计的示例灵敏度估计为5和10纳米/°和0.3分贝/°对于θ，ψ，和φ , 分别。