We report a spectroscopic investigation of potassium-lithium-tantalate-niobate (KTN:Li) across its room-temperature ferroelectric phase transition, when the sample manifests a supercrystal phase. Reflection and transmission results indicate an unexpected temperature-dependent enhancement of average index of refraction from 450 nm to 1100 nm, with no appreciable accompanying increase in absorption. Second-harmonic generation and phase-contrast imaging indicate that the enhancement is correlated to ferroelectric domains and highly localized at the supercrystal lattice sites. Implementing a two-component effective medium model, the response of each lattice site is found to be compatible with giant broadband refraction.

Falsi, L., Macis, S., Gelkop, Y., Tartara, L., Bonaventura, E., Di Pietro, P., et al. (2023). Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals. NANOMATERIALS, 13(5) [10.3390/nano13050899].

Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals

Bonaventura, E;
2023

Abstract

We report a spectroscopic investigation of potassium-lithium-tantalate-niobate (KTN:Li) across its room-temperature ferroelectric phase transition, when the sample manifests a supercrystal phase. Reflection and transmission results indicate an unexpected temperature-dependent enhancement of average index of refraction from 450 nm to 1100 nm, with no appreciable accompanying increase in absorption. Second-harmonic generation and phase-contrast imaging indicate that the enhancement is correlated to ferroelectric domains and highly localized at the supercrystal lattice sites. Implementing a two-component effective medium model, the response of each lattice site is found to be compatible with giant broadband refraction.
Articolo in rivista - Articolo scientifico
giant refraction; nanodisordered perovskite; nonlinear optics; spectroscopy; supercrystal;
English
27-feb-2023
2023
13
5
899
none
Falsi, L., Macis, S., Gelkop, Y., Tartara, L., Bonaventura, E., Di Pietro, P., et al. (2023). Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals. NANOMATERIALS, 13(5) [10.3390/nano13050899].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/480180
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