Abstract
Nonlinear Cherenkov radiation plays an important role in detecting the internal structure of the ferroelectric crystal. However, linear Cherenkov radiation in the ferroelectric crystal was not observed before. Based on mirror symmetry reduction at the domain walls, we theoretically predicted that the linear Cherenkov radiation could be generated in periodically poled ferroelectric crystals according to the coupled wave equation. Then, we experimentally demonstrated the generation of such Cherenkov radiation in domain walls. Compared with the domain region, new nonzero elements χ13, χ23, χ31 and χ32 appear in the linear susceptibility tensor. The experimental results are consistent with our theoretical prediction.
Highlights
In particle physics, the coherent electromagnetic wave can be emitted when the velocity of a charged particle exceeds the light velocity in a non-vacuum transparent medium, known as the traditional Cherenkov radiation (CR) [1]
In particle physics, the phenomenon of such CR has been investigated in the field of the nonlinear optics, which terms as the nonlinear Cherenkov radiation (NCR) [2]
In this paper, based on the mirror symmetry reduction of domain walls, we theoretically predict that the linear Cherenkov radiation (LCR) could be generated in ferroelectric crystal according to the coupled wave equation
Summary
The coherent electromagnetic wave can be emitted when the velocity of a charged particle exceeds the light velocity in a non-vacuum transparent medium, known as the traditional Cherenkov radiation (CR) [1]. Compared with the CR process of accelerated charged particles, the collection of dipoles radiation source of NCR is not a point driven by the incident light field, that pisartthieclep,oblaurtizaastipoantiaP lly. The mechanism of enhanced process in domain walls may be attributed to the new enhanced susceptibility tensor elements owing to the lattice distortion or the localized internal electrical field at domain walls [15, 16]. In this paper, based on the mirror symmetry reduction of domain walls, we theoretically predict that the linear Cherenkov radiation (LCR) could be generated in ferroelectric crystal according to the coupled wave equation. Comparing with the domain region, new nonzero elements χ13 , χ23 , χ31 and χ32 appear in the linear susceptibility tensor of domain walls, which is consistent with theoretical prediction
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