Ko Yeong Hwan, Magnusson Robert
Opt Lett. 2016 Oct 15;41(20):4704-4707. doi: 10.1364/OL.41.004704.
Narrow bandpass filters are applied in laser systems, imaging, telecommunications, and astronomy. Traditionally implemented with thin-film stacks, there is recent interest in alternative means incorporating photonic resonance effects. Here, we demonstrate a new approach to bandpass filters that engages the guided-mode resonance effect working with a cavity-based Fabry-Perot resonance to flatten and steepen the pass band. Both of these resonance mechanisms are native to simple resonant bandpass filters placed in a cascade. Numerical examples provide quantitative spectral properties including pass-band shape and sideband levels. Thus, we compare the spectra of single-layer 1D and 2D resonant gratings with the dual-cascade design incorporating identical gratings. Two- and three-cavity designs are measured against a classic multi-cavity thin-film filter with 151 layers. Whereas these initial results show comparable and improved results achieved with sparse structures, the challenge remains of developing a suitable fabrication technology to capitalize on this promise.
窄带通滤波器应用于激光系统、成像、电信和天文学领域。传统上是用薄膜堆叠来实现的，最近人们对纳入光子共振效应的替代方法产生了兴趣。在此，我们展示了一种用于带通滤波器的新方法，该方法利用基于腔的法布里 - 珀罗共振的导模共振效应来使通带变平并变陡。这两种共振机制对于级联放置的简单共振带通滤波器来说都是固有的。数值示例提供了包括通带形状和边带水平在内的定量光谱特性。因此，我们将单层一维和二维共振光栅的光谱与包含相同光栅的双级联设计进行比较。针对具有151层的经典多腔薄膜滤波器测量了双腔和三腔设计。虽然这些初步结果表明稀疏结构取得了可比且改进的结果，但开发一种合适的制造技术以利用这一前景仍然是一个挑战。
