Wang S S, Magnusson R
Opt Lett. 1994 Jun 15;19(12):919-21. doi: 10.1364/ol.19.000919.
We show that ideal reflection filters can be designed by combining guided-mode resonance effects in waveguide gratings with antireflection effects of thin-film structures. Since the guided-mode resonance effect overrides the antireflection effect this filter provides a symmetrical line shape with near-zero reflectivity over appreciable wavelength bands adjacent to the resonance wavelength. In the single-layer filter the same layer functions as the waveguide grating supporting the resonance and as the antireflection layer suppressing reflection around the resonance. A multilayer design allows the filter resonance peak to have a wide surrounding region of low reflectance. The central resonance wavelength, the filter linewidth, the range of the low sidebands, and the resonance line shape are all under the control of the designer.
我们表明，理想的反射滤波器可以通过将波导光栅中的导模共振效应与薄膜结构的抗反射效应相结合来设计。由于导模共振效应优于抗反射效应，该滤波器在与共振波长相邻的可观波长带内提供具有近零反射率的对称线形。在单层滤波器中，同一层既作为支持共振的波导光栅，又作为抑制共振周围反射的抗反射层。多层设计允许滤波器共振峰具有宽的低反射率周边区域。中心共振波长、滤波器线宽、低边带范围和共振线形均由设计者控制。
