Ultra-compact low threshold whispering-gallery terahertz quantum-cascade lasers

被引：0

作者：

Fasching, G. ^{[1
]}

Tamosiunas, V. ^{[2
,3
]}

Benz, A. ^{[1
]}

Andrews, A. M. ^{[1
]}

Deutsch, Ch. ^{[1
]}

Unterrainer, K. ^{[1
]}

Zobl, R. ^{[4
]}

Klang, P. ^{[4
]}

Schrenk, W. ^{[4
]}

Strasser, G. ^{[4
]}

机构：

[1] Vienna Univ Technol, Photon Inst, Gusshausstr 27-29, A-1040 Vienna, Austria

[2] Inst Semicond Phys, LT-01108 Vilnius, Lithuania

[3] Vilnius Gediminas Tech Univ, LT-10223 Vilnius, Lithuania

[4] Vienna Univ Technol, Ctr Micro Nanostruct, Inst Solid State Elect, A-1040 Vienna, Austria

来源：

2007 JOINT 32ND INTERNATIONAL CONFERENCE ON INFRARED AND MILLIMETER WAVES AND 15TH INTERNATIONAL CONFERENCE ON TERAHERTZ ELECTRONICS, VOLS 1 AND 2 | 2007年

基金：

奥地利科学基金会;

关键词：

terahertz; laser; quantum-cascade; microcavity; sub-wavelength;

D O I：

暂无

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：

We present terahertz quantum-cascade lasers with small mode volumes based on whispering-gallery resonators. The strong mode confinement in the growth and in-plane directions are provided by a double-metal waveguide. This allows laser emission from devices with overall dimensions much smaller than the free-air emission wavelength. These ultra-small devices lase inherently single-mode and exhibit threshold currents as low as 4.8 mA. We have observed dynamical frequency pulling of the resonator mode on the GHz scale. Thus, we were able to estimate the peak gain of the material to 27 cm(-1). Finite-difference time-domain simulations of these microcavity lasers validates that the experimentally observed lasing emission can be attributed to whispering gallery modes.

引用

页码：931 / +

页数：2

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