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18 September 2018 Liquid crystal based tunable PIN-photodiodes for detection around 1.55-μm
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In this work, we report InGaAs based photodiodes integrating liquid crystal (LC) microcells resonant microcavity on their surface. The LC microcavities monolithically integrated on the photodiodes act as a wavelength selective filter for the device. Photodetection measurements performed with a tunable laser operating in the telecom S and C bands demonstrated a wavelength sweep for the photodiode from 1480 nm to 1560 nm limited by the tuning range of the laser. This spectral window is covered with a LC driving voltage of 7V only, corresponding to extremely low power consumption. The average sensitivity over the whole spectral range is 0.4 A/W, slightly lower than 0.6 A/W for similar photodiodes that do not integrate such a LC tunable filter. The quality of the filter integrated onto the surfaces of the photodiodes is constant over a large tuning range (70 nm), showing a FWHM of 1.5 nm.
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C. Levallois, C. Paranthoen, B. Boisnard, T. Camps, B. Sadani, S. Pes, S. Bouchoule, L. Dupont, J.-B. Doucet, M. Alouini, and V. Bardinal "Liquid crystal based tunable PIN-photodiodes for detection around 1.55-μm", Proc. SPIE 10729, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz, 107290H (18 September 2018); doi: 10.1117/12.2322138;

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