Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 43, Issue 38, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/43/38/385103
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Funding
- National Research Projects of China [60525406, 60736031, 60806018, 60906026, 2006CB604903, 2007AA03Z446, 2009AA03Z403]
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A design of single-mode distributed feedback quantum cascade lasers (DFB-QCLs) with surface metal grating is described. A rigorous modal expansion theory is adopted to analyse the interaction between the waveguide mode and the surface plasmon wave for different grating parameters. A stable single-mode operation can be obtained in a wide range of grating depths and duty cycles. The single-mode operation of surface metal grating DFB-QCLs at room temperature for lambda = 8.5 mu m is demonstrated. The device shows a side-mode suppression ratio of above 20 dB. A linear tuning of wavelength with temperature indicates the stable single-mode operation without mode hopping.
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