2022
DOI: 10.1021/acsphotonics.2c00835
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Lithium Niobate Meta-Optics

Abstract: The rapid development of optical metasurfaces, 2D ensembles of engineered nanostructures, is presently underpinning a steady drive toward the miniaturization of many optical functionalities and devices. The list of material platforms for optical metasurfaces is rapidly expanding as, over the past few years, we have witnessed a surge in establishing meta-optical elements from high-index, highly transparent materials with strong nonlinear and electro-optic properties. In particular, crystalline lithium niobate (… Show more

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Cited by 50 publications
(27 citation statements)
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“…Noteworthy, its value is up to 2 orders of magnitude larger than the one achieved at optical frequencies. 16,21 A similar frequency-dependent behavior is observed for the d 31 element describing a resulting THz nonlinear polarization that is oriented along the e-axis.…”
Section: ■ Resultssupporting
confidence: 63%
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“…Noteworthy, its value is up to 2 orders of magnitude larger than the one achieved at optical frequencies. 16,21 A similar frequency-dependent behavior is observed for the d 31 element describing a resulting THz nonlinear polarization that is oriented along the e-axis.…”
Section: ■ Resultssupporting
confidence: 63%
“…This element of the nonlinear tensor is enhanced by a phonon resonance at 7.45 THz. Noteworthy, its value is up to 2 orders of magnitude larger than the one achieved at optical frequencies. , A similar frequency-dependent behavior is observed for the d 31 element describing a resulting THz nonlinear polarization that is oriented along the e -axis. Nonlinear mixing generating a nonlinear THz polarization oriented along one of the ordinary ( o ) axes, which is accounted for by the d 22 and d 15 elements, is instead enhanced by the o -axis phonon resonance at 4.5 THz.…”
Section: Resultssupporting
confidence: 59%
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“…To this end, LiNbO 3 (LN) is an interesting material as it has a noncentrosymmetric structure that confers outstanding nonlinear optics, and pyroelectric and piezoelectric properties, making it ideal for numerous applications in optics, batteries, and optical communications. At the nanoscale, LN NPs present low toxicity and lack phase-matching conditions, making them excellent candidates for bio-imaging and photo-triggered drug delivery. , Other features include its semiconducting and ferroelectric properties that enhance catalysis and photocatalysis, especially in redox reactions. These properties favor charge separation and polarization-induced facile adsorption .…”
Section: Introductionmentioning
confidence: 99%
“…Metasurfaces based on the LiNbO 3 -on-insulator platform were recently developed for various applications including electro-optic modulation, classical optical frequency conversion, and photon-pair generation . With this platform, we engineer and multiplex polarization state of photon pairs generated from a metasurface where periodic SiO 2 metagratings are fabricated on top of a subwavelength-thin layer of LiNbO 3 .…”
mentioning
confidence: 99%