High-speed hyperspectral imaging of ferroelectric domain walls using broadband coherent anti-Stokes Raman scattering

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Spontaneous Raman spectroscopy (SR) is a versatile method for analysis and visualization of ferroelectric crystal structures, including domain walls. Nevertheless, the necessary acquisition time makes SR impractical for in situ analysis and large scale imaging. In this work, we introduce broadband coherent anti-Stokes Raman spectroscopy (B-CARS) as a high-speed alternative to conventional Raman techniques and demonstrate its benefits for ferroelectric domain wall analysis. Using the example of poled lithium niobate, we compare the spectral output of both techniques in terms of domain wall signatures and imaging capabilities. We extract the Raman-like resonant part of the coherent anti-Stokes signal via a Kramers-Kronig-based phase retrieval algorithm and compare the raw and phase-retrieved signals to SR characteristics. Finally, we propose a mechanism for the observed domain wall signal strength that resembles a Cerenkov-like behavior, in close analogy to domain wall signatures obtained by second-harmonic generation imaging. We, thus, lay here the foundations for future investigations on other poled ferroelectric crystals using B-CARS.


Original languageEnglish
Article number162901
Number of pages6
JournalApplied physics letters
Issue number16
Publication statusPublished - 18 Apr 2022

External IDs

Scopus 85128905783
Mendeley 38cbb603-9536-3ec5-b2af-b32066d96c79
WOS 000791263200001
unpaywall 10.1063/5.0086029
ORCID /0000-0002-2484-4158/work/142257534


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