Optical properties of antiferromagnetic/ion-crystal superlattices

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• 作者：Jin-Xing Ta^a ; Yu-Ling Song^a ; Xuan-Zhang Wang^b ; ^{xzwang696@126.com}
• 关键词：Negative refraction ; Left-handedness ; Antiferromagnetic/ion-crystal superlattices
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 出版时间：January, 2012
• 年：2012
• 卷：324
• 期：1
• 页码：72-77
• 全文大小：666 K

文摘

Transmission, refraction and absorption properties of an antiferromagnetic/ion-crystal superlattice are investigated. The transmission spectra based on FeF₂/TlBr superlattices reveal that there exist two intriguing guided modes in a wide stop band. Additionally, FeF₂/TlBr superlattices possess either the negative refraction or the quasi left-handedness, or even simultaneously hold them at certain frequencies of two guided modes, which require both negative magnetic permeability of antiferromagnetic layers and negative permittivity of ion-crystal layers. Frequency regimes of the guided modes will be dependent on the magnitude of the external magnetic field. Therefore, handedness and refraction properties of the system can be manipulated by modifying the external magnetic field. Absorption spectra exhibit that absorption corresponding to guided modes is noticeable.