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Vivaldi End-Fire Antenna for THz Photomixers

Abdullah, Mohammad Faraz ; Mukherjee, Amlan K. ; Kumar, Rajesh ; Preu, Sascha (2022):
Vivaldi End-Fire Antenna for THz Photomixers. (Publisher's Version)
In: Journal of Infrared, Millimeter, and Terahertz Waves, 41 (6), pp. 728-739. Springer Nature, ISSN 1866-6892, e-ISSN 1866-6906,
DOI: 10.26083/tuprints-00020611,

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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Vivaldi End-Fire Antenna for THz Photomixers
Language: English

We propose a broadband end-fire antenna for continuous-wave terahertz (THz) photomixing–based devices working in the frequency range of 0.5–1 THz. A compact Vivaldi antenna is presented that does not require any hyper-hemispherical silicon lens to collect and collimate THz radiation unlike the conventionally used broadside antennas. The antenna is tailored to radiate THz into or receive radiation from a dielectric waveguide placed in close vicinity of it. The antenna is fabricated on an indium phosphide (InP) substrate. A silicon (Si) superstrate is used to improve the directionality of the radiated beam. THz power coupled into Si waveguides is measured using two different techniques between 0.1 and 1.15 THz. Firstly, the waveguide is placed in the optical path of a 1550 nm based continuous-wave THz setup with a commercial broadside emitter, focusing optics, and a detector fabricated on the InP substrate with log-periodic broadside antenna. Secondly, the waveguide is placed in direct contact with the designed Vivaldi antenna–based THz receiver and using the commercial broadside emitter as a source. It is observed that the direct coupling technique using the Vivaldi end-fire antenna outperforms the optically coupled approach at frequencies higher than 668 GHz. Efficient THz photoconductive sources and receivers based on the designed compact Vivaldi end-fire antenna will be suitable for launching THz power into on-chip THz circuitry and for compact THz systems.

Journal or Publication Title: Journal of Infrared, Millimeter, and Terahertz Waves
Volume of the journal: 41
Issue Number: 6
Publisher: Springer Nature
Classification DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Microwave Engineering and Photonics (IMP) > Terahertz Devices and Systems
TU-Projects: EC/H2020|713780|Pho-T-Lyze
Date Deposited: 14 Feb 2022 14:01
Last Modified: 14 Feb 2022 14:01
DOI: 10.26083/tuprints-00020611
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-206111
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20611
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