Effect of transverse mode structure on the far field pattern of metal-metal terahertz quantum cascade lasers

被引：13
|
作者：
Gellie, P. [1 ]
Maineult, W. [1 ]
Andronico, A. [1 ]
Leo, G. [1 ]
Sirtori, C. [1 ]
Barbieri, S. [1 ]
Chassagneux, Y. [3 ,4 ]
Coudevylle, J. R. [3 ,4 ]
Colombelli, R. [3 ,4 ]
Khanna, S. P. [2 ]
Linfield, E. H. [2 ]
Davies, A. G. [2 ]
机构：
[1] Univ Paris 07, F-75205 Paris, France
[2] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England
[3] Univ Paris Sud, Inst Elect Fondamentale, F-91405 Orsay, France
[4] CNRS, UMR8622, F-91405 Orsay, France
来源：
JOURNAL OF APPLIED PHYSICS | 2008年 / 104卷 / 12期
基金：
英国工程与自然科学研究理事会;
关键词：
quantum cascade lasers; ridge waveguides; submillimetre wave lasers;
D O I：
10.1063/1.3043795
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We elucidate the effects of the lateral mode structure on the far field pattern of metal-metal ridge-waveguide terahertz quantum cascade lasers. By introducing a 6-mu m-wide metal gap on the top metal contact, we suppress odd-parity lateral modes and drastically modify the far field pattern. Measurements are in good qualitative agreement with full three-dimensional finite-difference-time-domain modeling. Experimental evidence of nonuniform current pumping on the intensity distribution of the guided mode (and hence the far field pattern) is also presented and explained in terms of gain guiding.
引用
收藏
页数：4
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