Wide Frequency Tuning of Continuous Terahertz Wave Generated by Difference Frequency Mixing under Exciton-Excitation Conditions in a GaAs/AlAs Multiple Quantum Well

被引：7

作者：

Kojima, Osamu ^{[1
]}

Tarui, Yuki ^{[1
]}

Shimazu, Hideaki ^{[1
]}

Kita, Takashi ^{[1
]}

Majeed, Avan ^{[2
]}

Ivanov, Pavlo ^{[2
,3
]}

Clarke, Edmund ^{[2
]}

Hogg, Richard ^{[2
,3
]}

机构：

[1] Kobe Univ, Dept Elect & Elect Engn, Nada Ku, 1-1 Rokkodai, Kobe, Hyogo 6578501, Japan

[2] Univ Sheffield, Dept Elect & Elect Engn, Sheffield S3 7HQ, S Yorkshire, England

[3] Univ Glasgow, Dept Elect & Nanoscale Engn, Glasgow G12 8LT, Lanark, Scotland

来源：

PHYSICAL REVIEW APPLIED | 2018年 / 10卷 / 04期

基金：

日本学术振兴会;

关键词：

GAAS; ABSORPTION; DISPERSION; THZ;

D O I：

10.1103/PhysRevApplied.10.044035

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Continuous terahertz wave sources with narrow bandwidth and wide frequency tunability enable high-resolution terahertz spectroscopy and high-speed information communication. In this study, using the optical nonlinearity of excitons as the source of second-order nonlinear polarization, we realize a continuous terahertz electromagnetic wave demonstrating wide frequency tunability from 0.1 to 18 THz without a decrease in intensity due to phonon scattering. Because of excitation of two exciton states in a GaAs/AlAs multiple quantum well using two continuous-wave lasers, terahertz waves are emitted as a result of difference-frequency mixing, where the intensity shows a square dependence on the excitation intensity. Using the inhomogeneous width of exciton lines, we achieve wide frequency tunability without phonon effects.

引用

页数：6

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