@inproceedings{8fa36a9d934749479bf0e6505774a50f,
title = "Enhanced two-photon-absorption using sub-wavelength antennas",
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.",
keywords = "confinement, infrared, nanostructure, photodiode, plasmonics, subwavelength, two photon absorption",
author = "B. Vest and B. Portier and F. Pardo and N. P{\'e}r{\'e}-Laperne and E. Steveler and J. Jaeck and C. Dupuis and N. Bardou and A. Lema{\^i}tre and E. Rosencher and R. Ha{\"i}dar and Pelouard, \{J. L.\}",
note = "Publisher Copyright: {\textcopyright} 2015 SPIE.; Quantum Sensing and Nanophotonic Devices XII ; Conference date: 08-02-2015 Through 12-02-2015",
year = "2015",
month = jan,
day = "1",
doi = "10.1117/12.2075527",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Manijeh Razeghi and Eric Tournie and Brown, \{Gail J.\}",
booktitle = "Quantum Sensing and Nanophotonic Devices XII",
}