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Highly efficient ultra‐broadband terahertz modulation using bidirectional switching of liquid crystals
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Chen, Xuequan, Li, Kaidi, Zhang, Rui, Gupta, Swadesh Kumar, Srivastava, Abhishek Kumar and Pickwell-MacPherson, Emma (2019) Highly efficient ultra‐broadband terahertz modulation using bidirectional switching of liquid crystals. Advanced Optical Materials, 7 (24). 1901321. doi:10.1002/adom.201901321 ISSN 2195-1071.
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WRAP-highly-efficient-ultra-broadband-liquid-crystals-MacPherson-2019.pdf - Accepted Version - Requires a PDF viewer. Download (864Kb) | Preview |
Official URL: http://dx.doi.org/10.1002/adom.201901321
Abstract
Accurately manipulating field strength and polarization state are essential in various terahertz applications. Such manipulations are based on the efficient modulation of the amplitude and phase of electromagnetic waves. However, there is a lack of such terahertz modulators with sufficient efficiency and bandwidth. Herein, the Brewster–critical angle is exploited for modulation by using a nematic liquid crystal. Unlike liquid crystal phase shifters that only give a narrowband phase delay via a one‐directional switch, the presented device modulates both the amplitude and phase across an ultra‐broadbandwidth via a bidirectional active switch. An average intensity modulation depth over 99.6% is achieved for 0.2–1.6 THz. Furthermore, highly accurate polarization conversion between linear and circular states is also realized for 0.4–1.8 THz, with the average degree of linear and circular polarizations as high as 0.994 and 0.998, respectively. The superior accuracy, bandwidth, and active control achieved provide great potential for multifunctional terahertz modulation.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Terahertz spectroscopy , Liquid crystals , Polarization (Nuclear physics) | |||||||||||||||
Journal or Publication Title: | Advanced Optical Materials | |||||||||||||||
Publisher: | Wiley-Blackwell Publishing, Inc | |||||||||||||||
ISSN: | 2195-1071 | |||||||||||||||
Official Date: | 17 December 2019 | |||||||||||||||
Dates: |
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Volume: | 7 | |||||||||||||||
Number: | 24 | |||||||||||||||
Article Number: | 1901321 | |||||||||||||||
DOI: | 10.1002/adom.201901321 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Reuse Statement (publisher, data, author rights): | "This is the peer reviewed version of the following article: Chen, X., Li, K., Zhang, R., Gupta, S. K., Srivastava, A. K., Pickwell‐MacPherson, E., Highly Efficient Ultra‐Broadband Terahertz Modulation Using Bidirectional Switching of Liquid Crystals. Adv. Optical Mater. 2019, 1901321., which has been published in final form at http://dx.doi.org/10.1002/adom.201901321. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions." | |||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
Date of first compliant deposit: | 19 September 2019 | |||||||||||||||
Date of first compliant Open Access: | 18 September 2020 | |||||||||||||||
RIOXX Funder/Project Grant: |
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