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

Soylu, Gizem; Hérault, Émilie; Boulanger, Benoı̀t; Laurell, Fredrik; Coutaz, Jean‐Louis

doi:10.1007/s10762-020-00704-3

Cited by 3 publications

(2 citation statements)

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“…This could be applied to THz microscopy of opaque materials, like humid biological samples, e.g. when performing sub-wavelength OR THz imaging 7,8 .…”

Section: Discussionmentioning

confidence: 99%

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Terahertz generation through optical rectification in reflection

Kristensen

Hérault

Zhai

et al. 2023

Journal of Applied Physics

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In this paper, we study terahertz generation through optical rectification in reflection at normal incidence in a dielectric nonlinear crystal. We first analyze, with a nonlinear optical model, the sample parameters (thickness, absorption at both laser and terahertz wavelengths, etc.) for which a terahertz optical rectification reflection scheme is preferable to the common transmission scheme. Then, we report our experimental observations of a reflected terahertz signal generated at the surface of a ZnTe crystal. The reflected terahertz signal shares all the characteristics of a signal generated in transmission but is not limited by absorption losses in the crystal, thereby providing a broader bandwidth. At high pump laser power, the signal exhibits saturation, which is caused by the decrease of the nonlinear susceptibility due to photocarriers generated by two-photon absorption. This reflection scheme could be of great importance for terahertz microscopy of opaque materials like, e.g., humid samples or samples exhibiting strong absorption bands or to study samples for which the transmitted signal cannot be recorded.

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“…This could be applied to THz microscopy of opaque materials, like humid biological samples, e.g. when performing sub-wavelength OR THz imaging 7,8 .…”

Section: Discussionmentioning

confidence: 99%

“…Then, by improving our setup, we published an ORTI image of the domains of a periodically-poled KTP crystal with a lateral resolution of λ /200. 8 A next progress towards ORTI of actual samples will be to record images in reflection. It will allow one to characterize opaque or bulky samples, or samples whose rear face is rough.…”

Section: Introductionmentioning

confidence: 99%