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1 November 2010 Loss-reduction in midinfrared photonic crystal quantum cascade lasers using metallic waveguides
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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
©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Gangyi Xu, Raffaele Colombelli, Grégoire Beaudoin, Ludovic Largeau, Olivia Mauguin, and Isabel Sagnes "Loss-reduction in midinfrared photonic crystal quantum cascade lasers using metallic waveguides," Optical Engineering 49(11), 111112 (1 November 2010).
Published: 1 November 2010

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