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Perfect-Lens Theory Enables Metasurface Reflectors for Subwavelength Focusing

Taghvaee, Hamidreza; Liu, Fu; Díaz-Rubio, Ana; Tretyakov, Sergei

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Authors

Hamidreza Taghvaee

Fu Liu

Ana Díaz-Rubio

Sergei Tretyakov



Abstract

Breaking the so-called diffraction limit on the resolution of optical devices and achieving subwavelength focusing requires tailoring the evanescent spectrum of wave fields. There are several possible approaches, all of which have limitations, such as the generation of strong additional scattering, limited focusing power, issues at the implementation step, and the need for a drain at the focal point. This paper presents a feasible strategy based on the concepts of the perfect lens and power flow-conformal metasurfaces. Desired fields for subwavelength focusing are integrated using double-negative media and then the surface profile of a focusing reflector is designed to be tangential to the desired power flow, so that the metasurface can be modeled as a local impedance boundary, and can be easily implemented using passive and lossless elements. Full-wave simulations demonstrate that an example reactive metasurface is able to break the diffraction limit and provide near-field focusing with subwavelength hotspot size. We expect that the outcome will find applications in antennas, beam-shaping devices, nonradiative wireless power transfer systems, microscopy, and lithography.

Citation

Taghvaee, H., Liu, F., Díaz-Rubio, A., & Tretyakov, S. (2023). Perfect-Lens Theory Enables Metasurface Reflectors for Subwavelength Focusing. Physical Review Applied, 19(1), Article 014004. https://doi.org/10.1103/PhysRevApplied.19.014004

Journal Article Type Article
Acceptance Date Nov 7, 2022
Online Publication Date Jan 3, 2023
Publication Date Jan 3, 2023
Deposit Date Jan 24, 2023
Publicly Available Date Jan 27, 2023
Journal Physical Review Applied
Electronic ISSN 2331-7019
Publisher American Physical Society (APS)
Peer Reviewed Peer Reviewed
Volume 19
Issue 1
Article Number 014004
DOI https://doi.org/10.1103/PhysRevApplied.19.014004
Keywords General Physics and Astronomy
Public URL https://nottingham-repository.worktribe.com/output/15718420
Publisher URL https://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.19.014004

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