Reconfigurable flat-top narrow bandpass filter in prism pair coupled planar optical waveguide
Reconfigurable flat-top narrow bandpass filter in prism pair coupled planar optical waveguide
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DOI：
10.1016/j.optcom.2019.125038
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发表时间：
2020-03
影响因子：
2.4
通讯作者：
Jianhua Liu;Li Tao
中科院分区：
文献类型：
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作者：
Jianhua Liu;Li Tao
设计了一种具有平顶传输线形状的窄带纳米级可重构光学带通滤波器，并进行了理论分析。该滤波器由两个耦合棱镜和一个由5层均匀材料构成的夹层式平面光波导（POW）组成。数值模拟结果表明，该方法可以在可见光谱范围内获得平顶、完全零边带的单通带。通过±1. 0 μ m的波长调谐器，通带的中心波长可调谐约±14 nm。通过线性调节POW中心空气层的厚度，可使入射角改变78°，同时保持高透过率和带顶的平坦度。在调整过程中，带宽从0.92 nm变化到2.43 nm。该滤波器结构简单、灵活性强，可广泛应用于各种光学领域。
A reconfigurable optical bandpass filter with flat-top transmission line shape and narrow bandwidth in nanometer scale is designed and theoretically analyzed. The filter is composed of two coupling prisms and a sandwiched planar optical waveguide (POW) which is comprised of 5 layers of uniform materials with an air gap in the center. Numerical simulations demonstrate that a single passband in the visible spectrum with flat top and completely null sideband can be obtained. The central wavelength of the passband can be tuned by about±14 nm via a±1. 78° change of the incident angle while the high transmittance and flatness of the band top can always be maintained by almost linearly adjusting the thickness of the central air layer in the POW at the same time. During the adjustment process, the bandwidth changes from 0.92 to 2.43 nm. The simple structure and flexibility of the filter could facilitate its applications in various optical fields.