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Nonlinear generation and manipulation of erf beams in domain engineering materials 认领 引用
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作者 CHENG-LONG WANG RUI-ZHI ZHAO +10 位作者 SI-QIN YAN ZHEN-YU ZHAO XU-HUI SUN YI-ZHENG YAO JIA-XIN FU XIAO LEI XU-HAO HONG RONG-ER LU CHAO ZHANG YI-QIANG QIN YAN-QING LU 《Photonics Research》 SCIE EI CAS CSCD 2026年第7期3198-3205,共8页
The erf beam is a type of“perfect self-similar beam”characterized by a scaling transverse profile and constant intensity during free-space propagation.We demonstrate its natural emergence in the second-order nonline... The erf beam is a type of“perfect self-similar beam”characterized by a scaling transverse profile and constant intensity during free-space propagation.We demonstrate its natural emergence in the second-order nonlinear process in domain engineering materials,where the phase discontinuity at the domain wall directly gives rise to an erf beam under Fresnel diffraction.More importantly,domain walls can be regarded as fundamental excitation units phenomenologically,enabling the construction of complex harmonic fields through the superposition of individual erf beams.This provides a foundational framework for analyzing harmonic fields from complex structures and a design strategy for domain engineering materials.We experimentally verify the nonlinear method for generating erf beams using a poled LiTaO3crystal,and the results agree well with the predicted self-similar properties.The simplicity of this approach may facilitate its potential for practical applications. 展开更多
关键词 fresnel diffractionmore phase discontinuity domain wall nonlinear generation erf beam construction complex harmonic fie manipulation scaling transverse profile
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