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Terahertz generation mechanism in nanograting electrode photomixers on Fe-doped InGaAsP

Mohandas, RA; Freeman, JR; Natrella, M; Rosamond, MC; Ponnampalam, L; Fice, MJ; Seeds, AJ; ... Dean, P; + view all (2017) Terahertz generation mechanism in nanograting electrode photomixers on Fe-doped InGaAsP. Optics Express , 25 (9) pp. 10177-10188. 10.1364/OE.25.010177. Green open access

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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.

Type: Article
Title: Terahertz generation mechanism in nanograting electrode photomixers on Fe-doped InGaAsP
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.25.010177
Publisher version: http://doi.org/10.1364/OE.25.010177
Language: English
Additional information: Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Keywords: Science & Technology, Physical Sciences, Optics, WAVE GENERATION, OUTPUT POWER, LASER, GAAS, PERFORMANCE, TECHNOLOGY, EMISSION, DEVICES, SYSTEM, DIODE
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1558662
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