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首页> 外文期刊>IEEE sensors journal >An Arrayed Liquid Crystal Fabry–Perot Infrared Filter for Electrically Tunable Spectral Imaging Detection
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An Arrayed Liquid Crystal Fabry–Perot Infrared Filter for Electrically Tunable Spectral Imaging Detection

机译：用于电可调光谱成像检测的阵列液晶法布里-珀罗红外滤光片

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摘要

An arrayed electrically tunable infrared (IR) filter based on the key structure of liquid crystal Fabry–Perot (LC-FP) working in the wavelength range from 2.5 to is designed and fabricated successfully. According to the electrically controlled birefringence characteristics of nematic LC molecules, the refractive index of LC materials filled into a prefabricated microcavity can be adjusted by the spatial electric field stimulated between the top and bottom aluminum (Al) electrodes. As a crucial component of the filter, the Al film with a typical thickness of nm acts as the electrode as well as the reflective mirror. The particular functions, including key spectral selection and spectral adjustment, can be realized by the developed LC-FP filter driven electrically. Our experiments show that the maximum transmittance of the transmission peaks is %, and the transmission spectrum can be shifted remarkably through applying different voltage signals with a root mean square value range from 0 to . The experimental results are consistent with the simulation according to the model constructed by us. As a or four-channel IR filter, the top electrode of the device is composed of four same sub-electrodes. Each channel in the device is powered separately and synchronously to select desired transmission spectrum, which means that the device can be used to obtain spectral sub-images in different spectral bands in one shot.
机译：成功地设计和制造了一种基于液晶法布里-珀罗（LC-FP）液晶显示器关键结构的阵列电可调红外（IR）滤光片。根据向列LC分子的电控双折射特性，可以通过在顶部和底部铝（Al）电极之间激发的空间电场来调节填充到预制微腔中的LC材料的折射率。作为滤光片的重要组成部分，典型厚度为nm的Al膜既充当电极又充当反射镜。特定的功能，包括关键的光谱选择和光谱调整，可以通过电子驱动的已开发LC-FP滤波器实现。我们的实验表明，透射峰的最大透射率为％，并且通过施加均方根值范围为0至的不同电压信号，透射光谱可以显着移动。根据我们建立的模型，实验结果与仿真结果吻合。作为四通道或四通道红外滤光片，设备的顶部电极由四个相同的子电极组成。设备中的每个通道均单独且同步供电，以选择所需的传输频谱，这意味着该设备可用于一次拍摄获得不同光谱带中的光谱子图像。

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