Microwave space-time-modulated metasurfaces
Microwave space-time-modulated metasurfaces
Over the past decade, static metasurfaces have proved to be low-profile and efficient apparatuses for transformation of electromagnetic waves. However, such metasurfaces are restricted by their reciprocal and time- and frequency-invariant responses. To overcome these restrictions, space-time-modulated metasurfaces have recently been introduced for versatile, reciprocal/nonreciprocal, and frequency translation of electromagnetic waves. These are capable of changing both the momentum and energy of the incident wave and provide functionalities that are far beyond the capabilities of conventional static and reciprocal metasurfaces. This Perspective provides a discussion on the unique functionalities of a microwave space-time-modulated metasurface. In particular, we review various techniques that have been recently used for the realization of metasurfaces introducing spatiotemporal decomposition, scattering and diffraction, digital coding, nonreciprocal transmission, serrodyne frequency translation, pure frequency conversion, parametric wave amplification, and multifunctional operations. Although the paper focuses on microwave space-time metasurfaces, the described concepts can inspire realization of their optical counterparts.
electromagnetics, frequency generation, metasurfaces, nonreciprocity, space-time modulation, wave transformation
305-318
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Eleftheriades, George V.
280bbae6-32df-4af5-bcad-110f38ad72e7
16 February 2022
Taravati, Sajjad
0026f25d-c919-4273-b956-8fe9795b31ce
Eleftheriades, George V.
280bbae6-32df-4af5-bcad-110f38ad72e7
Abstract
Over the past decade, static metasurfaces have proved to be low-profile and efficient apparatuses for transformation of electromagnetic waves. However, such metasurfaces are restricted by their reciprocal and time- and frequency-invariant responses. To overcome these restrictions, space-time-modulated metasurfaces have recently been introduced for versatile, reciprocal/nonreciprocal, and frequency translation of electromagnetic waves. These are capable of changing both the momentum and energy of the incident wave and provide functionalities that are far beyond the capabilities of conventional static and reciprocal metasurfaces. This Perspective provides a discussion on the unique functionalities of a microwave space-time-modulated metasurface. In particular, we review various techniques that have been recently used for the realization of metasurfaces introducing spatiotemporal decomposition, scattering and diffraction, digital coding, nonreciprocal transmission, serrodyne frequency translation, pure frequency conversion, parametric wave amplification, and multifunctional operations. Although the paper focuses on microwave space-time metasurfaces, the described concepts can inspire realization of their optical counterparts.
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e-pub ahead of print date: 12 January 2022
Published date: 16 February 2022
Additional Information:
Funding Information:
This work is supported by the Natural Sciences and Engineering Research Council of Canada (NSERC).
Publisher Copyright:
©
Keywords:
electromagnetics, frequency generation, metasurfaces, nonreciprocity, space-time modulation, wave transformation
Identifiers
Local EPrints ID: 482825
URI: http://eprints.soton.ac.uk/id/eprint/482825
ISSN: 2330-4022
PURE UUID: 7069568c-c051-4c7b-9ddf-981e196ee3ca
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Date deposited: 12 Oct 2023 16:54
Last modified: 29 Apr 2024 02:04
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Author:
Sajjad Taravati
Author:
George V. Eleftheriades
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