Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals

Ludovica Falsi; Salvatore Macis; Yehonatan Gelkop; Luca Tartara; Eleonora Bonaventura; Paola Di Pietro; Andrea Perucchi; Yehudit Garcia; Galina Perepelitsa; Eugenio DelRe; Aharon J. Agranat; Stefano Lupi

doi:10.3390/nano13050899

Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals

Ludovica Falsi, Salvatore Macis, Yehonatan Gelkop, Luca Tartara, Eleonora Bonaventura, Paola Di Pietro, Andrea Perucchi, Yehudit Garcia, Galina Perepelitsa, Eugenio DelRe^*, Aharon J. Agranat, Stefano Lupi

^*Corresponding author for this work

Department of Applied Physics

Research output: Contribution to journal › Article › peer-review

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.

Original language	American English
Article number	899
Journal	Nanomaterials
Volume	13
Issue number	5
DOIs	https://doi.org/10.3390/nano13050899
State	Published - Mar 2023

Bibliographical note

Funding Information:
This research was funded by the Sapienza-Ricerca di Ateneo 2020 and 2021 projects, the H2020 Fet project PhoQus, PRIN 2020 (Grant No. 2020X4T57A), the Israel Science Foundation (Grant No. 1960/16) and PNRR MUR project PE0000023-NQSTI.

Publisher Copyright:
© 2023 by the authors.

Keywords

giant refraction
nanodisordered perovskite
nonlinear optics
spectroscopy
supercrystal

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title = "Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals",

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.",

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author = "Ludovica Falsi and Salvatore Macis and Yehonatan Gelkop and Luca Tartara and Eleonora Bonaventura and {Di Pietro}, Paola and Andrea Perucchi and Yehudit Garcia and Galina Perepelitsa and Eugenio DelRe and Agranat, {Aharon J.} and Stefano Lupi",

note = "Funding Information: This research was funded by the Sapienza-Ricerca di Ateneo 2020 and 2021 projects, the H2020 Fet project PhoQus, PRIN 2020 (Grant No. 2020X4T57A), the Israel Science Foundation (Grant No. 1960/16) and PNRR MUR project PE0000023-NQSTI. Publisher Copyright: {\textcopyright} 2023 by the authors.",

year = "2023",

month = mar,

doi = "10.3390/nano13050899",

language = "American English",

volume = "13",

journal = "Nanomaterials",

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AU - Falsi, Ludovica

AU - Macis, Salvatore

AU - Gelkop, Yehonatan

AU - Tartara, Luca

AU - Bonaventura, Eleonora

AU - Di Pietro, Paola

AU - Perucchi, Andrea

AU - Garcia, Yehudit

AU - Perepelitsa, Galina

AU - DelRe, Eugenio

AU - Agranat, Aharon J.

AU - Lupi, Stefano

N1 - Funding Information: This research was funded by the Sapienza-Ricerca di Ateneo 2020 and 2021 projects, the H2020 Fet project PhoQus, PRIN 2020 (Grant No. 2020X4T57A), the Israel Science Foundation (Grant No. 1960/16) and PNRR MUR project PE0000023-NQSTI. Publisher Copyright: © 2023 by the authors.

PY - 2023/3

Y1 - 2023/3

N2 - 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.

AB - 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.

KW - giant refraction

KW - nanodisordered perovskite

KW - nonlinear optics

KW - spectroscopy

KW - supercrystal

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SN - 2079-4991

VL - 13

JO - Nanomaterials

JF - Nanomaterials

IS - 5

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ER -

Anomalous Optical Properties of KTN:Li Ferroelectric Supercrystals

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Keywords

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