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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