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Polarization-Resolved Nonlinear Microscopy in Metallic and Ferroelectric Nanostructures for Imaging and Control in Complex Media

Carolina Rendón Barraza 1
Abstract : Nonlinear signals from metal and crystalline nanostructures are known to be highly polarization-dependent, due to their local symmetry properties originating from their bulk and/or surface responses. In nanostructures of sizes below the diffraction limit, polarized signals are generally analyzed by averaging polarization dependencies over the spatial extent of their diffraction-limited image spot (~300 nm). This approach misses however the possibility to exploit the spatial specificity of their polarization response. In this work, we develop a novel polarized nonlinear microscopy method that exploits sub-diffraction resolution information. Fourier analysis of the polarization modulated nonlinear signal is performed on over-sampled, drift-corrected images (50 nm pixel size). Even though the resulting nonlinear image is a diffraction-limited spot size, the information gained by polarization-induced modulation signals provides a higher level of spatial selectivity that is directly related to the local optical response of the investigated system, at a scale below the diffraction limit. The gain in spatial scale is due to the additional spatial sensitivity brought by polarization. This approach is applied to polarized second harmonic generation imaging in plasmonic nanostructures (150 nm size) of multi-branched shapes, in which the vectorial nature of the local field confinement can be retrieved with a resolution of 40 nm using polarized nonlinear microscopy. We also demonstrate the possibility to image spatial heterogeneities within crystalline ferroelectric BaTiO3 nanoparticles of 100 nm to 500 nm size, emphasizing in particular the existence of a centrosymmetric shell in small size structures. At last, KTiOPO4 nanocrystals which are ideal candidates for well-reported efficient nonlinear emission, have been used as nanoprobes of spatial local polarization states of a focused beam. We have developed a method based on phase and polarization wavefront shaping to create any desired sub-resolution vectorial pattern and studied the possibility to measure locally such polarization state exploiting the sum frequency polarized signal from such crystals. These studies show promising applications in the use of coherent vectorial probes in complex media.
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Contributor : Carolina Rendón Barraza <>
Submitted on : Tuesday, August 29, 2017 - 11:42:55 AM
Last modification on : Thursday, January 23, 2020 - 6:22:14 PM


Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International License


  • HAL Id : tel-01578469, version 1



Carolina Rendón Barraza. Polarization-Resolved Nonlinear Microscopy in Metallic and Ferroelectric Nanostructures for Imaging and Control in Complex Media. Optics [physics.optics]. Institut Fresnel; CNRS UMR 7249; Équipe Mosaic; Aix-Marseille Université, 2016. English. ⟨tel-01578469⟩



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