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arXiv 2010.09281physics.app-phcond-mat.mtrl-sciphysics.optics
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有效介质近似下的欺骗磁局域表面等离子体理论

Theory of Spoof Magnetic Localized Surface Plasmons Beyond Effective Medium Approximations

Carlo Rizza, Angelo Galante, Elia Palange, Marcello Alecci

摘要:

均匀的负磁导率球可以支持磁局域表面等离子体(MLSP)。通常,负磁导率材料是表现出非常深的亚波长空间尺度的超材料(MM)结构,其效果对于基于有效介质近似的那些应用在近场中可能是有害的。我们建议克服这一根本性的限制,通过分析证明,电磁空间分布,相关的MLSP谐振和近场源激发,可以准确地复制外的球,通过取代负磁导率球与均匀的高折射率介质具有相同的半径。考虑到大类铁电材料在低频(高达GHz)下表现出超高介电常数和低损耗,我们的欺骗MLSPs理论可能是在射频和微波区域实现高性能亚波长磁性光子器件的关键工具。

英文摘要:

A homogeneous negative permeability sphere can support magnetic localized surface plasmons (MLSPs). Generally, negative permeability materials are metamaterial (MM) structures exhibiting very deep subwavelength spatial scales, whose effects may be detrimental in the near-field for those applications based on effective medium approximations. We suggest to overcome this fundamental limitation by demonstrating analytically that the electromagnetic spatial distribution, associated to a MLSP resonance and excited by a near-field source, can be accurately reproduced outside the sphere by substituting the negative permeability sphere with a homogeneous high-index dielectric one with the same radius. Considering that a large class of ferroelectric materials shows ultra-high dielectric constant and low-losses at low frequency (up to GHz), our spoof MLSPs theory could be a key tool for realizing high performance subwavelength magnetic photonic devices in the radiofrequency and microwave regions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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