Wide frequency tuning of continuous terahertz wave generated by difference frequency mixing under exciton-excitation conditions in a GaAs/AlAs multiple quantum well

Kojima, O., Tarui, Y., Shimazu, H., Kita, T., Majeed, A., Ivanov, P., Clarke, E. and Hogg, R. (2018) Wide frequency tuning of continuous terahertz wave generated by difference frequency mixing under exciton-excitation conditions in a GaAs/AlAs multiple quantum well. Physical Review Applied, 10(4), 044035. (doi:10.1103/PhysRevApplied.10.044035)

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Abstract

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 Ga As / Al As 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.

Item Type:Articles
Additional Information:The authors acknowledge financial support provided by the Japan Society for the Promotion of Science KAKENHI program (Grants No. JP26289088 and No. 16KK0129).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ivanov, Dr Pavlo and Kojima, Professor Osamu and Hogg, Professor Richard
Authors: Kojima, O., Tarui, Y., Shimazu, H., Kita, T., Majeed, A., Ivanov, P., Clarke, E., and Hogg, R.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Physical Review Applied
Publisher:American Physical Society
ISSN:2331-7019
ISSN (Online):2331-7019
Published Online:12 October 2018
Copyright Holders:Copyright © 2018 American Physical Society
First Published:First published in Physical Review Applied 10(4): 044035
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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