Multi-band optical bandpass filter with picometer bandwidth in visible spectrum formed by prism pair coupled planar optical waveguide.
Multi-band optical bandpass filter with picometer bandwidth in visible spectrum formed by prism pair coupled planar optical waveguide.
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DOI：
10.1364/oe.25.012121
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发表时间：
2017-05
期刊：
影响因子：
3.8
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
对一种具有皮米级带宽（半高宽）的可见光谱多波段光学带通滤波器结构进行了理论分析。该滤波器采用棱镜对耦合平面光波导的形式。对于每个单独的导模，分别在可见光谱的紫色、绿色和红色区域中可获得多个通带。在考虑实际材料色散和损耗的情况下，可以获得高效率和对称的带形，且零边带平坦。每个波段的中心波长也可以在一定范围内进行角度调谐，而对效率或带宽的影响很小。这种超窄带滤光片可用于高分辨率光谱学、激光技术、光通信和光传感等领域。
An optical bandpass filter structure of multiple bands in the visible spectrum with bandwidths in picometer scale (full width at half maximum, FWHM) is theoretically analyzed. The filter is in a form of prism pair coupled planar optical waveguide. For each individual guided mode, multiple pass-bands are obtainable in violet, green, and red regions of the visible spectrum, respectively. High efficiencies and symmetric band shape with flat null sideband can be obtained with practical material dispersion and loss taken into account. The central wavelength of each band can also be angularly tuned within a certain range with little influence on the efficiency or bandwidth. This kind of ultra-narrow bandpass optical filter can be used in high resolution spectroscopies, laser technologies, optical communications, and optical sensing.