Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces.
Opt Lett
; 42(9): 1867-1870, 2017 May 01.
Article
em En
| MEDLINE
| ID: mdl-28454181
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 â¼68% 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.
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MEDLINE
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2017
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Article