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Proceedings Paper

Enhanced two-photon-absorption using sub-wavelength antennas
Author(s): B. Vest; B. Portier; F. Pardo; N. Péré-Laperne; E. Steveler; J. Jaeck; C. Dupuis; N. Bardou; A. Lemaître; E. Rosencher; R. Haïdar; J.-L. Pelouard
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Paper Abstract

Degenerate two-photon absorption (TPA) is investigated in a 186 nm thick gallium arsenide (GaAs) p-i-n diode embedded in a resonant metallic nanostructure. The full device consists in the GaAs layer, a gold subwavelength grating on the illuminated side, and a gold mirror on the opposite side. For TM-polarized light, the structure exhibits a resonance close to 1.47 μm, with a confined electric field in the intrinsic region, far from the metallic interfaces. A 109 times increase in photocurrent compared to a non-resonant device is obtained experimentally, while numerical simulations suggest that both gain in TPA-photocurrent and angular dependence can be further improved. For optimized grating parameters, a maximum gain of 241 is demonstrated numerically and over incidence angle range of (−30°; +30°). This structure paves the way towards low-noise infrared detection, using non-degenerate TPA, involving two photons of vastly different energies in the same process of absorption in a large bandgap semiconductor material.

Paper Details

Date Published: 8 February 2015
PDF: 7 pages
Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937018 (8 February 2015); doi: 10.1117/12.2075527
Show Author Affiliations
B. Vest, ONERA (France)
B. Portier, Lab. de Photonique et de Nanostructures, CNRS (France)
F. Pardo, Lab. de Photonique et de Nanostructures, CNRS (France)
N. Péré-Laperne, Lab. de Photonique et de Nanostructures, CNRS (France)
E. Steveler, Lab. de Photonique et de Nanostructures, CNRS (France)
J. Jaeck, ONERA (France)
C. Dupuis, Lab. de Photonique et de Nanostructures, CNRS (France)
N. Bardou, Lab. de Photonique et de Nanostructures, CNRS (France)
A. Lemaître, Lab. de Photonique et de Nanostructures, CNRS (France)
E. Rosencher, ONERA (France)
R. Haïdar, ONERA (France)
J.-L. Pelouard, Lab. de Photonique et de Nanostructures, CNRS (France)


Published in SPIE Proceedings Vol. 9370:
Quantum Sensing and Nanophotonic Devices XII
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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