We show that a metal-dielectric Fabry-Perot (FP) structure can exhibit an omnidirectional transmission for p-polarized light, which means a passband is independent of the incidence angle of light. The omni-directional passband occurs when the sum of the reflection phase shift at the metal-spacer interface and the propagation shift in the spacer region is almost 2pi for every incidence angle. We numerically and experimentally demonstrate such an omnidirectional narrow bandpass filter in an air/Ag/ZnS/Ag/glass structure. Moreover, we introduce an antireflection coating on both sides of the metal-dielectric FP structure. The transmittance will increase obviously, while the omnidirectional property remains the same.
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机译：我们表明，金属电介质法布里-珀罗（FP）结构可以对p偏振光展现全向透射，这意味着通带与光的入射角无关。当每个入射角的金属-隔离物界面处的反射相移与间隔区中的传播移相之和几乎为2pi时，就会发生全方向通带。我们通过数值和实验证明了这种全向窄带通滤波器在空气/ Ag / ZnS / Ag /玻璃结构中的作用。此外，我们在金属电介质FP结构的两侧引入了防反射涂层。在全向不变的情况下，透射率将明显增加。
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