Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/113024
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Type: | Journal article |
Title: | Dielectric-resonator metasurfaces for broadband terahertz quarter- and half-wave mirrors |
Author: | Lee, W. Ako, R. Xian Low, M. Bhaskaran, M. Sriram, S. Fumeaux, C. Withayachumnankul, W. |
Citation: | Optics Express, 2018; 26(11):14392-14406 |
Publisher: | OSA Publishing |
Issue Date: | 2018 |
ISSN: | 1094-4087 1094-4087 |
Statement of Responsibility: | Wendy S. L. Lee, Rajour T. Ako, Mei Xian Low, Madhu Bhaskaran, Sharath Sriram, Christophe Fumeaux, and Withawat Withayachumnankul |
Abstract: | Polarization conversion of terahertz waves is important for applications in imaging and communications. Conventional wave plates used for polarization conversion are inherently bulky and operate at discrete wavelengths. As a substitute, we employ reflective metasurfaces composed of subwavelength resonators to obtain similar functionality but with enhanced performance. More specifically, we demonstrate low-order dielectric resonators in place of commonly used planar metallic resonators to achieve high radiation efficiencies. As a demonstration of the concept, we present firstly, a quarter-wave mirror that converts 45° incident linearly polarized waves into circularly polarized waves. Next, we present a half-wave mirror that preserves the handedness of circularly polarized waves upon reflection, and in addition, rotates linearly polarized waves by 90° upon reflection. Both metasurfaces operate with high efficiency over a measurable relative bandwidth of 49% for the quarter-wave mirror and 53% for the half-wave mirror. This broadband and high efficiency capabilities of our metasurfaces will allow to leverage maximum benefits from a vast terahertz bandwidth. |
Rights: | © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement |
DOI: | 10.1364/OE.26.014392 |
Grant ID: | http://purl.org/au-research/grants/arc/DP170101922 http://purl.org/au-research/grants/arc/DP180103561 |
Published version: | http://dx.doi.org/10.1364/oe.26.014392 |
Appears in Collections: | Aurora harvest 3 Electrical and Electronic Engineering publications |
Files in This Item:
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hdl_113024.pdf | Published version | 7.08 MB | Adobe PDF | View/Open |
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