Metasurfaces characterized by a transverse gradient of local impedance have recently opened exciting directions for light manipulation at the nanoscale. Here we add a temporal gradient to the picture, showing that spatio-temporal variations over a surface may largely extend the degree of light manipulat...
Time-varying metasurfaces and Lorentz non-reciprocity. Opt. Mater. Express 5, 2459 (2015). Google Scholar Hadad, Y., Sounas, D. L. & Alu, A. Space–time gradient metasurfaces. Phys. Rev. B 92, 100304(R) (2015). Google Scholar Taravati, S. & Eleftheriades, G. V. Generalized...
The spatiotemporal phase modulation greatly expands the functions of conventional static phase gradient metasurfaces, providing an additional degree of freedom for manipulating the temporal properties of light and achieving nonreciprocal light propagation. Particularly, we achieved in our experiment a 2.8-...
Recently, scientists developed a new type of optical metasurface with which phase modulation in both space and time is imposed on the reflected light, leading to different paths for the forward and backward light propagation. For the first time, nonreciprocal light propagation in free space was...
In recent years, there has been notable advancement in programmable metasurfaces, primarily attributed to their cost-effectiveness and capacity to manipulate electromagnetic (EM) waves. Nevertheless, a significant limitation of numerous available metasur
Correas-Serrano, D. et al. Nonreciprocal graphene devices and antennas based on spatiotemporal modulation. IEEE Antennas Wirel. Propag. Lett. 15, 1529–1532 (2015). Article ADS Google Scholar Hadad, Y., Sounas, D. L. & Alu, A. Space-time gradient metasurfaces. Phys. Rev. B 92, 100...
Breaking reciprocity with space‐time‐coding digital metasurfaces. Adv. Mater. 31, 1904069 (2019). Google Scholar Zang, J. W. et al. Nonreciprocal wavefront engineering with time-modulated gradient metasurfaces. Phys. Rev. Appl. 11, 054054 (2019). Google Scholar Wang, X. & Caloz, C...
metasurfaces governed by the generalized Snell’s laws exhibit only space-gradient phase discontinuities on the interfaces, and are inherently constrained by Lorentz reciprocity and time-reversal symmetry. In 2015, Hadad et al. proposed the concept of space-time gradient metasurfaces11,12, by applyin...
Space-time-coding digital metasurfaces. Nat. Commun. 9, 4334 (2018). Article ADS Google Scholar Shaltout, A. M. et al. Spatiotemporal light control with frequency-gradient metasurfaces. Science 365, 374 (2019). Article ADS Google Scholar Ogino, J. et al. 10 J operation of a ...
Temporal modulation with tailored waveforms enables the design of a spectrum of sidebands. By impressing a spatial phase gradient on the metasurface, we can diffract selected combinations of sideband frequencies. Combining active temporal and spatial variation can enable unique optical functions, such as...