Time-varying gradient metasurface with applications in all-optical beam steering

Karimi, Mohammad; Alam, M. Zahirul; Upham, Jeremy; Reshef, Orad; Boyd, Robert W.

doi:10.1515/nanoph-2022-0756

Time-varying gradient metasurface with applications in all-optical beam steering

Journal Article · Wed Mar 22 00:00:00 EDT 2023 · Nanophotonics (Online)

DOI:https://doi.org/10.1515/nanoph-2022-0756· OSTI ID:2424645

^[1]; Alam, M. Zahirul ^[1]; Upham, Jeremy ^[1]; Reshef, Orad ^[1]; Boyd, Robert W. ^[2]

Univ. of Ottawa, ON (Canada)
Univ. of Ottawa, ON (Canada); Univ. of Rochester, NY (United States)

Integrating the large, subpicosecond nonlinear optical response of epsilon-near-zero (ENZ) materials with the broad design freedoms of plasmonic metasurfaces shows potential for creating rapidly modulated optical devices with possible applications in telecommunications, sensing, and reactive beam steering. In this work, we experimentally investigate a metasurface consisting of a plasmonic gradient array on a thin layer of indium tin oxide (ITO), characterize how incident probe pulses diffract from a system as it is being dynamically modulated by a pump pulse at wavelengths near the ENZ region. Angular shifts in the diffraction orders are observed and can be principally attributed to the adiabatic wavelength conversion of the probe as it witnesses the temporal change of index induced by the pump. Of note, the asymmetric gradient metasurface, considered to be a blazed diffraction grating, shows significantly different dynamic responses for different diffraction orders. The free-space wavelength shift to +1 and -1 diffraction orders is 6 and 12 nm, resulting in steering angle changes of 0.65 and 1.5°, respectively.

View Accepted Manuscript (DOE)

Research Organization:: Radiation Effects Research Foundation (RERF), Hiroshima (Japan)

Sponsoring Organization:: USDOE; Defense Advanced Research Projects Agency (DARPA); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); National Science Foundation (NSF)

OSTI ID:: 2424645

Journal Information:: Nanophotonics (Online), Journal Name: Nanophotonics (Online) Journal Issue: 9 Vol. 12; ISSN 2192-8614

Publisher:: de GruyterCopyright Statement

Country of Publication:: United States

Language:: English

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Time-varying gradient metasurface with applications in all-optical beam steering

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