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Liquid crystal based tunable PIN-photodiodes for detection around 1.55-µm
Author(s): C. Levallois; C. Paranthoen; B. Boisnard; T. Camps; B. Sadani; S. Pes; S. Bouchoule; L. Dupont; J.-B. Doucet; M. Alouini; V. Bardinal
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Paper 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.

Paper Details

Date Published: 18 September 2018
PDF: 7 pages
Proc. SPIE 10729, Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz, 107290H (18 September 2018); doi: 10.1117/12.2322138
Show Author Affiliations
C. Levallois, Univ. Rennes, INSA Rennes, Institut FOTON, CNRS (France)
C. Paranthoen, Univ. Rennes, INSA Rennes, Institut FOTON, CNRS (France)
B. Boisnard, Univ. Toulouse, LAAS, CNRS (France)
T. Camps, Univ. Toulouse, LAAS, CNRS (France)
B. Sadani, Univ. Toulouse, LAAS, CNRS (France)
S. Pes, Univ. Rennes, INSA Rennes, Institut FOTON, CNRS (France)
S. Bouchoule, Ctr. de Nanosciences et de Nanotechnologies, Univ. Paris-Sud, CNRS (France)
L. Dupont, Telecom Bretagne (France)
J.-B. Doucet, Univ. Toulouse, LAAS, CNRS (France)
M. Alouini, Univ. Rennes, INSA Rennes, Institut FOTON, CNRS (France)
V. Bardinal, Univ. Toulouse, LAAS, CNRS (France)


Published in SPIE Proceedings Vol. 10729:
Optical Sensing, Imaging, and Photon Counting: From X-Rays to THz
Oleg Mitrofanov; Chee Hing Tan; José Luis Pau Vizcaíno; Manijeh Razeghi, Editor(s)

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