Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3295704
Keywords
distributed feedback lasers; holography; photonic crystals; quantum cascade lasers
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Funding
- National Research Projects of China [60525406, 60736031, 60806018, 60906026, 2006CB604903, 2007AA03Z446, 2009AA03Z403]
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We demonstrate room temperature operation of photonic-crystal distributed-feedback quantum cascade lasers emitting at 4.7 mu m. A rectangular photonic crystal lattice perpendicular to the cleaved facet was defined using holographic lithography. The anticrossing of the index- and Bragg-guided dispersions of rectangular lattice forms the band-edge mode with extended mode volume and reduced group velocity. Utilizing this coupling mechanism, single mode operation with a near-diffractive-limited divergence angle of 12 degrees is obtained for 33 mu m wide devices in a temperature range of 85-300 K. The reduced threshold current densities and improved heat dissipation management contribute to the realization of devices' room temperature operation.
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