Improving the Out-Coupling of a Metal-Metal Terahertz Frequency Quantum Cascade Laser Through Integration of a Hybrid Mode Section into the Waveguide

被引：3

作者：

Fobbe, Tobias ^{[1
,2
]}

Nong, Hanond ^{[1
]}

Schott, Ruediger ^{[2
]}

Pal, Shovon ^{[1
,2
]}

Markmann, Sergej ^{[1
]}

Hekmat, Negar ^{[1
]}

Zhu, Jingxuan ^{[3
]}

Han, Yingjun ^{[3
]}

Li, Lianhe ^{[3
]}

Dean, Paul ^{[3
]}

Linfield, Edmund H. ^{[3
]}

Davies, A. Giles ^{[3
]}

Wieck, Andreas D. ^{[2
]}

Jukam, Nathan ^{[1
]}

机构：

[1] Ruhr Univ Bochum, AG Terahertz Spektroskopie & Technol, D-44780 Bochum, Germany

[2] Ruhr Univ Bochum, Lehrstuhl Angew Festkorperphys, D-44780 Bochum, Germany

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

来源：

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES | 2016年 / 37卷 / 05期

基金：

英国工程与自然科学研究理事会;

关键词：

Terahertz; Hybrid waveguide; Metal-metal waveguide; Surface plasmon waveguide; Quantum cascade laser; HIGH-POWER;

D O I：

10.1007/s10762-015-0239-4

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A hybrid mode section is integrated into the end of the metal-metal waveguide of a terahertz (THz) frequency quantum cascade laser (QCL) by removing sub-wavelength portions of the top metal layer. This allows a hybrid mode to penetrate into the air, which reduces the effective index of the mode and improves the out-coupling performance at the facet. The transmission of the hybrid section is further increased by ensuring its length fulfills the criterion for constructive interference. These simple modifications to a 2.5-THz metal-metal QCL waveguide result in a significant increase in the output emission power. In addition, simulations show that further improvements in out-coupling efficiency can be achieved for lower frequencies with effective refractive indices close to the geometric mean of the indices of the metal-metal waveguide and air.

引用

页码：426 / 434

页数：9

共 28 条

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Tobias Fobbe
Hanond Nong
Rüdiger Schott
Shovon Pal
Sergej Markmann
Negar Hekmat
Jingxuan Zhu
Yingjun Han
Lianhe Li
Paul Dean
Edmund H. Linfield
A. Giles Davies
Andreas D. Wieck
Nathan Jukam
[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 2016, 37 : 426 - 434
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Fobbe, Tobias
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Schott, Ruediger
Pal, Shovon
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Hekmat, Negar
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