High second-harmonic generation of antiferromagnetic/ionic-crystal composite medium with negative refraction

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• 作者：Yu-Ling Song^a ; Jin-Xing Ta^b ; Xuan-Zhang Wang^a ; ^{xzwang696@126.com}
• 关键词：Antiferromagnetic/ionic-crystal multilayer ; Composite medium ; Second harmonic generation ; Negative refraction
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：324
• 期：6
• 页码：1214-1217
• 全文大小：382 K

文摘

Second harmonic generation (SHG) from a short-period structure composed of alternating antiferromagnetic (AF) and ionic-crystal layers is investigated, where the generated harmonic waves are situated in the far-infrared range and attributed to the magnetically nonlinear interaction in AF layers. The presence of a kind of appropriate ionic-crystal layers in the structure can support negative refraction for the pumping wave and positive refraction for the SH wave, so the SHG is greatly amplified in the vicinity of each AF resonant frequency. For the composite structure FeF₂/TlBr, we found that the SH output is about 8 times higher than that of the FeF₂ bulk in the same frequency range.