26 October 2013 A tunable liquid crystal Fabry-Perot hyperspectral imaging device in mid-infrared wavelength range
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Proceedings Volume 8917, MIPPR 2013: Multispectral Image Acquisition, Processing, and Analysis; 891704 (2013) https://doi.org/10.1117/12.2032159
Event: Eighth International Symposium on Multispectral Image Processing and Pattern Recognition, 2013, Wuhan, China
Abstract
This paper proposes a method to characterize a liquid crystal Fabry-Perot (LC-FP) hyperspectral imaging devices with electrically controlling and shifting wavelength of light beam penetrating the LC-FP device proposed. As the effect of the directing vector distribution of LC materials can be remarkably changed and stably anchored in an electric field applied over the electrodes of the device, the refractive index of the LC materials which filled into FP cavity can be modulated by voltage signal with relatively low amplitude. We achieved the transmissivity properties of the infrared radiation out from the LC-FP and continuously incident upon the photosensitive structure through the thin film matrix equation, and then acquired the basic relationship among the transmissivity, and the applied voltage signal, and the wavelength parameter selected. The key features of the proposal approach is that the device is mainly composed of very thin electrically modulating refractive-index architecture, which are generally two basic FP interferometers connected closely so as to accurately perform the choice of the wavelength desired in the spectral range by the interference filtering; and the depths of the two FP interferometers are designed to be different, and through combination two parts mentioned above we can obtain some single wavelengths desired of penetrating beam. The proposed device has already been complished. The final device will be used to sequentially choose each desired infrared (IR) wavelength from incident IR radiation. Prototypes of the LC-FP with 4×4 arrays is going to be made, thus we can get several different wavelengths with the device.
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Anbang Fu, Huaidong Zhang, Xinyu Zhang, Hongshi Sang, Tianyu Zhang, Changsheng Xie, "A tunable liquid crystal Fabry-Perot hyperspectral imaging device in mid-infrared wavelength range", Proc. SPIE 8917, MIPPR 2013: Multispectral Image Acquisition, Processing, and Analysis, 891704 (26 October 2013); doi: 10.1117/12.2032159; https://doi.org/10.1117/12.2032159
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