Stable single-mode distributed feedback quantum cascade laser with surface metal grating
- Zhang W (Zhang W.)
- Wang LJ (Wang L. J.)
- Zhang JC (Zhang J. C.)
- Zhang QD (Zhang Q. D.)
- Li L (Li L.)
- Liu JQ (Liu J. Q.)
- Liu FQ (Liu F. Q.)
- Wang ZG (Wang Z. G.)
- Zhang, W, Chinese Acad Sci, Key Lab Semicond Mat Sci, Inst Semicond, Beijing 100083, Peoples R China. E-mail Address: ljwang@semi.ac.cn
Publication date
January 2010
DOI ISSN
0022-3727 Citation count (estimate)
1Abstract
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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