Engineering vertical emission in THz quantum cascade lasers

被引：0
|
作者：
Tredicucci, Alessandro [1 ]
机构：
[1] CNR INFM, NEST, I-56127 Pisa, Italy
来源：
QUANTUM SENSING AND NANOPHOTONIC DEVICES VII | 2010年 / 7608卷
关键词：
Terahertz; quantum cascade lasers; vertical emission; surface plasmons; distributed feedback; microdisk lasers; quasi-periodic resonators; gratings; TERAHERTZ; MICRODISK;
D O I：
10.1117/12.839500
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
Surface emission from distributed feedback terahertz quantum cascade lasers operating in double-metal waveguides is investigated. After analyzing the origin of vertical out-coupling in linear second-order gratings, the enhancement of radiative efficiency achieved with quasi-periodic and circular gratings is presented. Linear Fibonacci resonators and microdisk lasers have been realized allowing great flexibility in tailoring the surface emission intensity and profile. Finally, ring lasers showing high power collimated emission in the vertical direction by employing a double-slit grating configuration will be discussed.
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页数：11
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