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An active terahertz polarization converter employing vanadium dioxide and a metal wire grating in total internal reflection geometry

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Liu, Xudong, Chen, Xuequan, Parrott, Edward P. J., Han, Chunrui, Humbert, Georges, Crunteanu, Aurelian and Pickwell-MacPherson, Emma (2018) An active terahertz polarization converter employing vanadium dioxide and a metal wire grating in total internal reflection geometry. APL Photonics, 3 (5). 051604. doi:10.1063/1.5010940

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Official URL: http://dx.doi.org/10.1063/1.5010940

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Abstract

Active broadband terahertz (THz) polarization manipulation devices are challenging to realize, but also of great demand in broadband terahertz systems. Vanadium dioxide (VO2) shows a promising phase transition for active control of THz waves and provides broadband polarization characteristics when integrated within grating-type structures. We creatively combine a VO2-based grating structure with a total internal reflection (TIR) geometry providing a novel interaction mechanism between the electromagnetic waves and the device, to realize a powerful active broadband THz polarization-controlling device. The device is based on a Si-substrate coated with a VO2 layer and a metal grating structure on top, attached to a prism for generating the TIR condition on the Si-VO2-grating interface. The grating is connected to electrodes for electrically switching the VO2 between its insulating and conducting phases. By properly selecting the incident angle of the THz waves, the grating direction, and the incident polarization state, we first achieved a broadband intensity modulator under a fused silica prism with an average modulation depth of 99.75% in the 0.2-1.1 THz region. Additionally, we realized an active ultra-broadband quarter-wave converter under a Si prism that can be switched between a 45° linear rotator and a quarter wave converter in the 0.8-1.5 THz region. This is the first demonstration of an active quarter-wave converter with ultra-broad bandwidth performance. Our work shows a highly flexible and multifunctional polarization-controlling device for broadband THz application.

Item Type: Journal Article
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Terahertz technology, Ultra-wideband devices, Photonics
Journal or Publication Title: APL Photonics
Publisher: A I P Publishing LLC
ISSN: 2378-0967
Official Date: 9 February 2018
Dates:
DateEvent
9 February 2018Available
4 January 2018Accepted
24 October 2017Submitted
Date of first compliant deposit: 5 March 2018
Volume: 3
Number: 5
Article Number: 051604
DOI: 10.1063/1.5010940
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
14201415Research Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
14205514Research Grants Council, University Grants Committeehttp://dx.doi.org/10.13039/501100002920
ITS/291/14Innovation and Technology Commission - Hong Konghttp://dx.doi.org/10.13039/501100007156

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