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.
Anomalous optical properties of KTN:Li ferroelectric supercrystals / Falsi, Ludovica; Macis, Salvatore; Gelkop, Yehonatan; Tartara, Luca; Bonaventura, Eleonora; DI PIETRO, Paola; Perucchi, Andrea; Garcia, Yehudit; Perepelitsa, Galina; Delre, Eugenio; Agranat, Aharon J.; Lupi, Stefano. - In: NANOMATERIALS. - ISSN 2079-4991. - 13:5(2023). [10.3390/nano13050899]
Anomalous optical properties of KTN:Li ferroelectric supercrystals
Ludovica FalsiCo-primo
;Salvatore MacisCo-primo
;Eleonora Bonaventura;Paola Di Pietro;Eugenio DelRe
;Stefano Lupi
2023
Abstract
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.File | Dimensione | Formato | |
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