journal article·2022-11

Co‐Polarized Second Harmonic Generation Induced by Ferroelectric Domains and Domain Wall Arrays

Han Gao, Chao Chen, Lu You, Fei Sun, Chengliang Lu, Sijie Yang, Guofu Zhou, Deyang Chen, Yibo Han, Jun‐Ming Liu

Advanced Optical Materials· Volume 10· Issue 21
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Abstract

Abstract Optical second harmonic generation (SHG) is a sensitive and powerful technique to probe various symmetry breaking, especially ferroelectric/magnetic domains, in artificial thin films or heterostructures. In a wide range of ferroelectric crystals, a non‐trivial broken symmetry will emerge at domain boundaries, however, the contribution of such symmetry breaking to SHG is often neglected due to its random orientation. Here, a co‐polarized SHG effect from the well‐aligned domain wall arrays is observed in BiFeO3 thin films. This SHG component is highly dependent on the local orientation of the wall arrays, and its polarization feature reveals the Néel‐like evolution of electric polar vectors in the wall region. Based on this intriguing effect, mixed‐phase patches with four possible orientations in the quasi‐tetragonal stripes are identified by polarization‐sensitive SHG mapping. These findings not only clarify a critical SHG contribution in this multiferroic material, but also demonstrate an optical approach for exploring phase‐determined function unit.
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Research context

OpenAlex topics: Photorefractive and Nonlinear Optics · Magneto-Optical Properties and Applications · Multiferroics and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 P. R. China

Institute for Advanced Materials South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 P. R. China

Jiangsu Key Laboratory of Thin Films School of Physical Science and Technology Soochow University Suzhou 215006 P. R. China

School of Physics Huazhong University of Science and Technology Wuhan 430074 P. R. China

State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 P. R. China

Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 P. R. China

Funding

National Natural Science Foundation of China · Department of Education of Guangdong Province

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