Nonlinear response in a material increases with its index of refraction as n^4. Commonly, n ~ 1 so that diffraction, dispersion, and chromatic walk-off limit nonlinear scattering. Ferroelectric crystals with a periodic 3D polarization structure overcome some of these constraints through versatile Cherenkov and quasi-phase-matching mechanisms. Three-dimensional self-structuring can also lead to a giant optical refraction. Here, we perform second-harmonic-generation experiments in KTN:Li in conditions of giant broadband refraction. Enhanced response causes wavelength conversion to occur in the form of bulk Cherenkov radiation without diffraction and chromatic walk-off, even in the presence of strong wave-vector mismatch and highly focused beams. The process occurs with a wide spectral acceptance of more than 100 nm in the near infrared spectrum, an ultra-wide angular acceptance of up to ±40∘, with no polarization selectivity, and can be tuned to allow bulk supercontinuum generation. Results pave the way to highly efficient and adaptable nonlinear optical devices with the promise of single-photon-to-single-photon nonlinear optics.

Constraint-free wavelength conversion supported by giant optical refraction in a 3D perovskite supercrystal / Falsi, Ludovica; Tartara, Luca; Di Mei, Fabrizio; Flammini, Mariano; Parravicini, Jacopo; Pierangeli, Davide; Parravicini, Gianbattista; Xin, Feifei; Diporto, Paolo; Agranat, Aharon J.; Delre, Eugenio. - In: COMMUNICATIONS MATERIALS. - ISSN 2662-4443. - 1:1(2020). [10.1038/s43246-020-00077-z]

Constraint-free wavelength conversion supported by giant optical refraction in a 3D perovskite supercrystal

Falsi, Ludovica
;
Di Mei, Fabrizio;Flammini, Mariano;Pierangeli, Davide;Xin, Feifei;DelRe, Eugenio
2020

Abstract

Nonlinear response in a material increases with its index of refraction as n^4. Commonly, n ~ 1 so that diffraction, dispersion, and chromatic walk-off limit nonlinear scattering. Ferroelectric crystals with a periodic 3D polarization structure overcome some of these constraints through versatile Cherenkov and quasi-phase-matching mechanisms. Three-dimensional self-structuring can also lead to a giant optical refraction. Here, we perform second-harmonic-generation experiments in KTN:Li in conditions of giant broadband refraction. Enhanced response causes wavelength conversion to occur in the form of bulk Cherenkov radiation without diffraction and chromatic walk-off, even in the presence of strong wave-vector mismatch and highly focused beams. The process occurs with a wide spectral acceptance of more than 100 nm in the near infrared spectrum, an ultra-wide angular acceptance of up to ±40∘, with no polarization selectivity, and can be tuned to allow bulk supercontinuum generation. Results pave the way to highly efficient and adaptable nonlinear optical devices with the promise of single-photon-to-single-photon nonlinear optics.
ferroelectrics; nonlinear optics; photonics
01 Pubblicazione su rivista::01a Articolo in rivista
Constraint-free wavelength conversion supported by giant optical refraction in a 3D perovskite supercrystal / Falsi, Ludovica; Tartara, Luca; Di Mei, Fabrizio; Flammini, Mariano; Parravicini, Jacopo; Pierangeli, Davide; Parravicini, Gianbattista; Xin, Feifei; Diporto, Paolo; Agranat, Aharon J.; Delre, Eugenio. - In: COMMUNICATIONS MATERIALS. - ISSN 2662-4443. - 1:1(2020). [10.1038/s43246-020-00077-z]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1447720
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