An investigation on optimum ridge width and exposed side strips width of terahertz quantum cascade lasers with metal-metal waveguides

被引：4

作者：

Xu, Chao ^{[1
]}

Razavipour, Seyed Ghasem ^{[1
]}

Wasilewski, Zbigniew ^{[1
]}

Ban, Dayan ^{[1
]}

机构：

[1] Univ Waterloo, Dept Elect & Comp Engn, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada

来源：

OPTICS EXPRESS | 2013年 / 21卷 / 26期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

Quantum cascade lasers;

D O I：

10.1364/OE.21.031951

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The impacts of side exposed side strips (for high order modes suppression) and ridge width on terahertz (THz) quantum cascade laser (QCL) performance are investigated through numerical modeling and verified experimentally. Our results show that shrinking ridge width of THz QCLs with metal-metal waveguides leads to a substantial degradation of device performance due to higher optical loss resulting from the side-exposed strips in the highly-doped top contact layer. Nevertheless, the side-exposed strips facilitate single mode operation by strongly suppressing higher-order modes. An optimal width of the side exposed strips is obtained for achieving adequate higher-order mode suppression and maintaining sufficiently low fundamental mode loss. (C) 2013 Optical Society of America

引用

页码：31951 / 31959

页数：9