Kim Sangsik, Man Mengren, Qi Minghao, Webb Kevin J
Opt Lett. 2014 Oct 1;39(19):5784-7. doi: 10.1364/OL.39.005784.
We present a metal-dielectric stack ultraviolet (UV) bandpass filter that rejects the longer wavelength, visible spectrum and is thin and relatively insensitive to the angle of incidence. Parametric evaluations of the reflection phase shift at the metal-dielectric interface provide insight and design information. This nontrivial phase shift allows coupled Fabry-Perot resonances with subwavelength dielectric film thickness. Furthermore, the total phase shift, with contributions from wave propagation and nontrivial reflection phase shift, is insensitive to the angle of incidence. Filter passbands in the UV can be shifted to visible or longer wavelengths by engineering the dielectric thickness and selecting a metal with an appropriate plasma frequency.
我们展示了一种金属-电介质堆叠式紫外（UV）带通滤波器，它能滤除较长波长的可见光谱，并且厚度薄，对入射角相对不敏感。对金属-电介质界面处反射相移的参数评估提供了见解和设计信息。这种非平凡的相移允许与亚波长电介质薄膜厚度的耦合法布里-珀罗共振。此外，由波传播和非平凡反射相移贡献的总相移对入射角不敏感。通过设计电介质厚度并选择具有合适等离子体频率的金属，紫外波段的滤波器通带可以移至可见光或更长波长。
