Liquid crystal based tunable PIN-photodiodes for detection around 1.55-µm

C. Levallois; C. Paranthoen; B. Boisnard; T. Camps; B. Sadani; S. Pes; S. Bouchoule; L. Dupont; J.-B. Doucet; M. Alouini; V. Bardinal

doi:10.1117/12.2322138

18 September 2018 Liquid crystal based tunable PIN-photodiodes for detection around 1.55-μm

C. Levallois, C. Paranthoen, B. Boisnard, T. Camps, B. Sadani, S. Pes, S. Bouchoule, L. Dupont, J.-B. Doucet, M. Alouini, V. Bardinal

Author Affiliations +

Proceedings Volume 10729, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz; 107290H (2018) https://doi.org/10.1117/12.2322138
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

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); https://doi.org/10.1117/12.2322138

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KEYWORDS

Liquid crystals

Tunable filters

Optical microcavities

Photodiodes

Tunable lasers

Polarization

Spectrometer engineering

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