THz waveguide adapters for efficient radiation out-coupling from double metal THz QCLs

被引：10

作者：

Castellano, Fabrizio ^{[1
,2
]}

Li, Lianhe ^{[3
]}

Linfield, Edmund H. ^{[3
]}

Davies, A. Giles ^{[3
]}

Beere, Harvey E. ^{[4
]}

Ritchie, David A. ^{[4
]}

Vitiello, Miriam S. ^{[1
,2
]}

机构：

[1] CNR Ist Nanosci, NEST, I-56127 Pisa, Italy

[2] Scuola Normale Super Pisa, I-56127 Pisa, Italy

[3] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England

[4] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

OPTICS EXPRESS | 2015年 / 23卷 / 04期

基金：

英国工程与自然科学研究理事会;

关键词：

QUANTUM-CASCADE LASERS; CRYSTAL TERAHERTZ LASERS;

D O I：

10.1364/OE.23.005190

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report the development of on-chip optical components designed to improve the out-coupling of double-metal terahertz (THz) frequency quantum cascade lasers (QCLs). A visible reshaping of the optical beam is achieved, independent of the precise waveguide configuration, by direct incorporation of cyclic-olefin copolymer (COC) dielectric optical fibers onto the QCL facet. A major improvement is further achieved by incorporating a micromachined feed-horn waveguide, assembled around the THz QCL and integrated with a slit-coupler. In its first implementation, we obtain a +/- 20 degrees beam divergence, offering the potential for high-efficiency radiation coupling from a metal-metal waveguide into optical fibers. (C) 2015 Optical Society of America

引用

页码：5190 / 5200

页数：11

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