ph1c01582_si_001.pdf (320.56 kB)
Tunable Metasurface Using Thin-Film Lithium Niobate in the Telecom Regime
journal contribution
posted on 2022-01-10, 22:04 authored by Aharon Weiss, Christian Frydendahl, Jonathan Bar-David, Roy Zektzer, Eitan Edrei, Jacob Engelberg, Noa Mazurski, Boris Desiatov, Uriel LevyMetasurfaces
have seen a great evolution over the last few years,
demonstrating a high degree of control over the amplitude, phase,
polarization, and spectral properties of reflected or transmitted
electromagnetic waves. Nevertheless, the inherent limitation of static
metasurface realizations, which cannot be controlled after their fabrication,
engages an ongoing pursuit for reconfigurable metasurfaces with profound
tunability. In this paper, we mitigate this grand challenge by demonstrating
a new method for free-space rapid optical tunability and modulation,
utilizing a planar aluminum nanodisk metasurface coated with indium
tin oxide (ITO) on a thin film of lithium niobate (LiNbO) with a chromium/gold
(Cr/Au) substrate. Resonance coupling gives rise to an enhanced, confined
electromagnetic field residing in the thin film, leading to a narrow
and high contrast dip in reflectance of around 1.55 μm. The
precise spectral position of this resonance is tuned using the electro-optic
Pockels effect by applying an electric bias voltage across the thin
film of LiNbO. By doing so, we show that we can likewise modulate
the optical reflectance from the metasurface around a wavelength of
1.54 μm. Following that, we experimentally demonstrate a free-space,
planar optical modulator with a modulation depth of 40%. The device
paves the way for the integration of metasurfaces in applications
requiring tunable optical components such as tunable displays, spatial
light modulators for advanced imaging, free-space communication, beam
scanning LIDARs with no moving parts, and more.
History
Usage metrics
Categories
Keywords
transmitted electromagnetic wavesspatial light modulatorsoptic pockels effectindium tin oxidebeam scanning lidarsstatic metasurface realizationsprecise spectral positionplanar optical modulatorhigh contrast diptelecom regime metasurfacesfilm lithium niobatelithium niobatethin filmspectral propertiesmetasurface aroundhigh degreetuned usingtunable displaysreconfigurable metasurfacesprofound tunabilityoptical reflectanceongoing pursuitnew methodmoving partslikewise modulateinherent limitationgreat evolutiongrand challengeexperimentally demonstratedevice pavesadvanced imaging55 μm54 μm40 %.
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC