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Sub-Wavelength THz Imaging of the Domains in Periodically Poled Crystals Through Optical Rectification

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Abstract

By focusing a femtosecond laser beam onto the lateral face of a periodically poled KTP crystal, we generate a THz pulse through optical rectification of the laser pulse. The THz signal is recorded by means of a common THz time-domain technique, which allows us to obtain both the magnitude and sign of the THz waveform, and then the magnitude and phase of its spectral components thanks to a numerical Fourier-transform. By moving the laser beam along the crystal, we record a THz signal that renders for the alternative orientation of the crystal domains, with a lateral resolution as good as 10 μm, whatever the THz wavelength. This demonstrates the potential of the Optical Rectification TeraHertz Imaging (ORTI) technique to produce sub-wavelength THz images.

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Funding

The work of G. Soylu is supported by the French LabEx FOCUS ANR-11-LABX-0013 project. University Savoie Mont Blanc (France) and the Royal Institute of Technology (Sweden) collaborate through the NATO Science for Peace project G5396.

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Authors and Affiliations

  1. IMEP-LAHC, University Savoie Mont Blanc, 73376, Le Bourget du Lac Cedex, France

    Gizem Soylu, Emilie Hérault & Jean-Louis Coutaz

  2. CNRS, Grenoble INP, Institut Néel, Université Grenoble Alpes, 38000, Grenoble, France

    Benoît Boulanger

  3. Department of Applied Physics, Royal Institute of Technology, Roslagstullsbacken 21, 10691, Stockholm, Sweden

    Fredrik Laurell

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  1. Gizem Soylu
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  2. Emilie Hérault
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  3. Benoît Boulanger
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  4. Fredrik Laurell
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  5. Jean-Louis Coutaz
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Correspondence to Jean-Louis Coutaz.

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Soylu, G., Hérault, E., Boulanger, B. et al. Sub-Wavelength THz Imaging of the Domains in Periodically Poled Crystals Through Optical Rectification. J Infrared Milli Terahz Waves 41, 1144–1154 (2020). https://doi.org/10.1007/s10762-020-00704-3

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