Surface-wave-assisted nonreciprocity in spatio-temporally modulated metasurfaces

Emerging photonic functionalities are mostly governed by the fundamental principle of Lorentz reciprocity. Lifting the constraints imposed by this principle could circumvent deleterious effects that limit the performance of photonic systems. Most efforts to date have been limited to waveguide platfo...

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Bibliographic Details
Published in:Nature communications Vol. 11; no. 1; pp. 1469 - 9
Main Authors: Cardin, Andrew E., Silva, Sinhara R., Vardeny, Shai R., Padilla, Willie J., Saxena, Avadh, Taylor, Antoinette J., Kort-Kamp, Wilton J. M., Chen, Hou-Tong, Dalvit, Diego A. R., Azad, Abul K.
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 19.03.2020
Nature Publishing Group
Nature Portfolio
Subjects:
639/624/1075/1081
639/624/399/1015
Beam steering
Design
Far fields
Forward scattering
Humanities and Social Sciences
Laboratories
Metasurface, Metamaterials, Nonreciprocal
Metasurfaces
Microwave Photonics
multidisciplinary
NANOSCIENCE AND NANOTECHNOLOGY
Optics
Photonics
Propagation
Reciprocity
Science
Science (multidisciplinary)
Spacetime
Surface waves
Wave propagation
ISSN:2041-1723, 2041-1723
Online Access:Get full text
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Summary:Emerging photonic functionalities are mostly governed by the fundamental principle of Lorentz reciprocity. Lifting the constraints imposed by this principle could circumvent deleterious effects that limit the performance of photonic systems. Most efforts to date have been limited to waveguide platforms. Here, we propose and experimentally demonstrate a spatio-temporally modulated metasurface capable of complete violation of Lorentz reciprocity by reflecting an incident beam into far-field radiation in forward scattering, but into near-field surface waves in reverse scattering. These observations are shown both in nonreciprocal beam steering and nonreciprocal focusing. We also demonstrate nonreciprocal behavior of propagative-only waves in the frequency- and momentum-domains, and simultaneously in both. We develop a generalized Bloch-Floquet theory which offers physical insights into Lorentz nonreciprocity for arbitrary spatial phase gradients, and its predictions are in excellent agreement with experiments. Our work opens exciting opportunities in applications where free-space nonreciprocal wave propagation is desired. Overcoming reciprocity is important for novel functionalities. Here, the authors demonstrate a spatio-temporally modulated metasurface capable of complete violation of Lorentz reciprocity by reflecting an incident beam into far-field radiation in forward scattering, but into near-field surface waves in reverse scattering.
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89233218CNA000001
LA-UR-19-30765
USDOE Laboratory Directed Research and Development (LDRD) Program
USDOE Office of Science (SC), Basic Energy Sciences (BES)
USDOE National Nuclear Security Administration (NNSA)
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-15273-1