Dielectric-resonator metasurfaces for broadband terahertz quarter- and half-wave mirrors

Lee, W, Ako, R, Low, M, Bhaskaran, M, Sriram, S, Fumeaux, C and Withayachumnnankul, W 2018, 'Dielectric-resonator metasurfaces for broadband terahertz quarter- and half-wave mirrors', Optics Express, vol. 26, no. 11, pp. 14392-14406.


Document type: Journal Article
Collection: Journal Articles

Title Dielectric-resonator metasurfaces for broadband terahertz quarter- and half-wave mirrors
Author(s) Lee, W
Ako, R
Low, M
Bhaskaran, M
Sriram, S
Fumeaux, C
Withayachumnnankul, W
Year 2018
Journal name Optics Express
Volume number 26
Issue number 11
Start page 14392
End page 14406
Total pages 15
Publisher Optical Society of America
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 e ciencies. 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 e ciency over a measurable relative bandwidth of 49% for the quarter-wave mirror and 53% for the half-wave mirror. This broadband and high e ciency capabilities of our metasurfaces will allow to leverage maximum benefits from a vast terahertz bandwidth.
Subject Microelectronics and Integrated Circuits
Functional Materials
Keyword(s) Polarizing Beam Splitter
Time-Domain Spectroscopy
Polarization Conversion
Plate
Metamaterials
Birefringence
Frequencies
Refraction
Region
Reflectarray
DOI - identifier 10.1364/OE.26.014392
Copyright notice © 2018 Optical Society of America
ISSN 1094-4087
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