Increase in terahertz-wave intensity in a magnetic field due to difference-frequency mixing by exciton excitation in a GaAs/AlAs multiple quantum well

Kojima, O., Tarui, Y., Kita, T., Majeed, A., Ivanov, P., Clarke, E. and Hogg, R. A. (2022) Increase in terahertz-wave intensity in a magnetic field due to difference-frequency mixing by exciton excitation in a GaAs/AlAs multiple quantum well. Optics Express, 30(7), pp. 11789-11796. (doi: 10.1364/OE.453812) (PMID:35473114)

Abstract

Magnetic fields can increase the intensity of terahertz (THz) waves due to changing the dipole moment direction using the Lorentz force. This study reports the increase in the THz-wave intensity generated by differential frequency mixing using commercial permanent magnets under exciton-excitation. While a weak magnetic field applied to a multiple quantum well increases the THz-wave intensity due to excitons, a strong field causes its decrease. According to the calculations, the increase is caused by the electron-hole separation due to the Lorentz force. Furthermore, the calculations suggest the importance of carrier acceleration to enhance the intensity. Importantly, the increase in the THz-wave intensity due to differential frequency mixing does not require a strong magnetic field and can be achieved with inexpensive commercially available magnets.

• Item Type: Articles
• Additional Information: Funding: Japan Society for the Promotion of Science (16KK0129, 19K04532, 21K03435, 26289088); JSPS International Research Fellow; Kawanishi Memorial ShinMaywa Education Foundation; Support Center for Advanced Telecommunications Technology Research Foundation; MIKIYA Science and Technology Foundation; Hyogo Foundation for Science and Technology.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Ivanov, Dr Pavlo and Hogg, Professor Richard
• Authors: Kojima, O., Tarui, Y., Kita, T., Majeed, A., Ivanov, P., Clarke, E., and Hogg, R. A.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Optics Express
• Publisher: Optical Society of America
• ISSN: 1094-4087
• ISSN (Online): 1094-4087
• Published Online: 23 March 2022
• Copyright Holders: Copyright © 2022 Optica Publishing Group
• First Published: First published in Optics Express 30(7): 11789-11796
• Publisher Policy: Reproduced in accordance with the publisher copyright policy