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Abstract: We report on important influence of single domain wall DW of electricallypoled ferroelectric crystal on parametric processes via Cherenkov-type phasematching. It shows that the effective nonlinear polarization is confined in DWand its phase velocity can be modulated when incident light is off domainwall-s direction. These effects lead to novel Cherenkov second harmonicgeneration CSHG which has no analogue in bulk ferroelectrics. ComplexDW-modulated parametric process via Cherenkov-type phase matching, such asCherenkov sum frequency generation CSFG, is also demonstrated in DW. Wepropose that nonlinear coefficient in DW is significantly enhanced.



Autor: Xuewei Deng, Huaijin Ren, Yuanlin Zheng, Xianfeng Chen

Fuente: https://arxiv.org/







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