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Optical Engineering

Loss-reduction in midinfrared photonic crystal quantum cascade lasers using metallic waveguides
Author(s): Gangyi Xu; Raffaele Colombelli; Grégoire Beaudoin; Ludovic Largeau; Olivia Mauguin; Isabel Sagnes
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Paper Abstract

We describe a mechanism for plasmonic loss reduction in midinfrared metallic photonic crystals and apply it to surface-plasmon quantum cascade lasers. We obtain pulsed, room-temperature operation of surface-emitting photonic crystal quantum cascade lasers operating at 7.4 µm. The photonic crystal resonator is patterned in the device top metallization, and laser operation is obtained on a band-edge mode of the photonic band structure. The emission is spectrally single mode, with a side-mode suppression ratio of 20 dB, and on-chip tunability is obtained over a wavelength range of 0.52 µm. Simulations based on a finite elements approach and on the finite-difference time-domain method allow us to study the photonic-band structure, the electromagnetic field distributions, and especially, the influence of the device parameters on the losses. The comparison between the measured and simulated far-field emission patterns and polarization proves the lasers operate on a monopolar-symmetry mode

Paper Details

Date Published: 1 November 2010
PDF: 7 pages
Opt. Eng. 49(11) 111112 doi: 10.1117/1.3516518
Published in: Optical Engineering Volume 49, Issue 11
Show Author Affiliations
Gangyi Xu, Institut d'Électronique Fondamentale (France)
Raffaele Colombelli, Institut d'Électronique Fondamentale (France)
Grégoire Beaudoin, Ctr. National de la Recherche Scientifique (France)
Ludovic Largeau, Ctr. National de la Recherche Scientifique (France)
Olivia Mauguin, Ctr. National de la Recherche Scientifique (France)
Isabel Sagnes, Ctr. National de la Recherche Scientifique (France)


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