Wide bandwidth and high resolution planar filter array based on DBR-metasurface-DBR structures
Wide bandwidth and high resolution planar filter array based on DBR-metasurface-DBR structures
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DOI：
10.1364/oe.24.011677
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发表时间：
2016-05-30
期刊：
影响因子：
3.8
通讯作者：
Faraon, Andrei
中科院分区：
文献类型：
--
作者：
Horie, Yu;Arbabi, Amir;Faraon, Andrei
我们提出并实验证明了一种由低损耗介电超表面层夹在两个分布式布拉格反射器（dbr）之间的平面光学带通滤波器阵列。两个dbr形成一个法布里-珀罗谐振腔，其中心波长由作为移相元件的透射超表面层的设计控制。我们展示了一组中心波长随空间变化的带通滤波器，覆盖了λ = 1550nm （δ λ / λ = 16%）附近250nm的宽工作波长范围。仅通过改变夹层超表面的面内几何形状即可独立控制各滤光片的中心波长，实验测量的质量因子均大于700。所演示的滤波器阵列可以直接集成在光电探测器阵列上，以实现具有自由空间耦合的片上高分辨率光谱仪。(C) 2016年美国光学学会
We propose and experimentally demonstrate a planar array of optical bandpass filters composed of low loss dielectric metasurface layers sandwiched between two distributed Bragg reflectors (DBRs). The two DBRs form a Fabry-Perot resonator whose center wavelength is controlled by the design of the transmissive metasurface layer which functions as a phase shifting element. We demonstrate an array of bandpass filters with spatially varying center wavelengths covering a wide range of operation wavelengths of 250nm around lambda = 1550nm (Delta lambda/lambda = 16%). The center wavelengths of each filter are independently controlled only by changing the in-plane geometry of the sandwiched metasurfaces, and the experimentally measured quality factors are larger than 700. The demonstrated filter array can be directly integrated on top of photodetector arrays to realize on-chip high-resolution spectrometers with free-space coupling. (C) 2016 Optical Society of America