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Type: Journal article
Title: Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces
Author: Chang, C.-C.
Headland, D.
Abbott, D.
Withayachumnankul, W.
Chen, H.-T.
Citation: Optics Letters, 2017; 42(9):1867-1870
Publisher: Optical Society of America
Issue Date: 2017
ISSN: 0146-9592
Statement of
Chun-Chieh Chang, Daniel Headland, Derek Abbott, Withawat Withayachumnankul, and Hou-Tong Chen
Abstract: We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2π range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μm-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ∼68% overall efficiency at the operating frequency of 400 GHz. This device has potential for applications in terahertz imaging and communications, as well as beam control in general.
Description: Published 1 May 2017
Rights: © 2017 Optical Society of America
DOI: 10.1364/OL.42.001867
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