Mohandas, RA, Freeman, JR orcid.org/0000-0002-5493-6352, Natrella, M et al. (10 more authors) (2017) Terahertz generation mechanism in nano-grating electrode photomixers on Fe-doped InGaAsP. Optics Express, 25 (9). pp. 10177-10188. ISSN 1094-4087
Abstract
We report the generation mechanism associated with nano-grating electrode photomixers fabricated on Fe-doped InGaAsP substrates. Two different emitter designs incorporating nano-gratings coupled to the same broadband antenna were characterized in a continuous-wave terahertz (THz) frequency system employing telecommunications wavelength lasers for generation and coherent detection. The current-voltage characteristics and THz emission bandwidth of the emitters is compared for different bias polarities and optical polarisations. The THz output from the emitters is also mapped as a function of the position of the laser excitation spot for both continuous-wave and pulsed excitation. This mapping, together with full-wave simulations of the structures, confirms the generation mechanism to be due to an enhanced optical electric field at the grating tips resulting in increased optical absorption, coinciding with a concentration of the electrostatic field.
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Copyright, Publisher and Additional Information: | Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License [https://creativecommons.org/licenses/by/4.0/]. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. | ||||||||||||
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Institution: | The University of Leeds | ||||||||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) | ||||||||||||
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Depositing User: | Symplectic Publications | ||||||||||||
Date Deposited: | 28 Apr 2017 15:56 | ||||||||||||
Last Modified: | 23 Jun 2023 22:28 | ||||||||||||
Published Version: | https://doi.org/10.1364/OE.25.010177 | ||||||||||||
Status: | Published | ||||||||||||
Publisher: | Optical Society of America | ||||||||||||
Identification Number: | https://doi.org/10.1364/OE.25.010177 | ||||||||||||
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