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Lookup NU author(s): Dr Victor Pacheco Pena
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The performance of an ultrathin (thickness<0.04λ0) metasurface superoscillatory lens (metaSOL) is experimentally demonstrated in the terahertz (THz) range. The metaSOL is designed using two different hexagonal unit cells to improve the efficiency and properties of the conventional transparent–opaque zoning approach. The focusing metastructure produces, at a frequency fexp = 295 GHz, a sharp focal spot 8.9λexp away from its output surface with a transversal resolution of 0.52λexp (approximately 25%below the resolution limit imposed by diffraction), a power enhancement of 18.2 dB, and very low side lobe level (approximately13 dB). Resolution below the diffraction limit is demonstrated in a broad fractional operation bandwidth of 18%. The focusing capabilities of the proposed metaSOL show its potential use in a range of applications such as THz imaging, microscopy, and communications.
Author(s): Legaria S, Teniente J, Kuznetsov S, Pacheco-Peña V, Beruete M
Publication type: Article
Publication status: Published
Journal: Advanced Photonics Research
Online publication date: 06/05/2021
Acceptance date: 05/05/2021
Date deposited: 27/07/2021
ISSN (electronic): 2699-9293
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