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8 February 2015 Enhanced two-photon-absorption using sub-wavelength antennas
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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.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
B. Vest, B. Portier, F. Pardo, N. Péré-Laperne, E. Steveler, J. Jaeck, C. Dupuis, N. Bardou, A. Lemaître, E. Rosencher, R. Haïdar, and J.-L. Pelouard "Enhanced two-photon-absorption using sub-wavelength antennas", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 937018 (8 February 2015);

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