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Highly Efficient Focusing of Terahertz Waves with an Ultrathin Superoscillatory Metalens: Experimental Demonstration

Lookup NU author(s): Dr Victor Pacheco PenaORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

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 f_exp = 295 GHz, a sharp focal spot 8.9λ_exp away from its output surface with a transversal resolution of 0.52λ_exp (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.

Publication metadata

Author(s): Legaria S, Teniente J, Kuznetsov S, Pacheco-Peña V, Beruete M

Publication type: Article

Publication status: Published

Journal: Advanced Photonics Research

Year: 2021

Online publication date: 06/05/2021

Acceptance date: 05/05/2021

Date deposited: 27/07/2021

ISSN (electronic): 2699-9293

Publisher: Wiley

URL: https://doi.org/10.1002/adpr.202000165

DOI: 10.1002/adpr.202000165

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