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arXiv 1602.02551physics.optics
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增强型磁光器件的暗模-法拉第旋转协同效应

Dark Mode - Faraday Rotation Synergy for Enhanced Magneto-Optics

Y. Mazor, M. Meir, Ben Z. Steinberg

摘要:

我们研究暗模式等离子体作为增强磁光平台的功效。小粒子的暗模是由两个强度相等但相互对立的偶极激发共存而成的。这两个相对的偶极子中的每一个甚至可以在暗模式频率处或附近谐振,但是净偶极矩由于相对偶极子之间的相互抵消而消失。我们表明,施加外偏磁可以减轻强烈的相消干涉。此外,在外部磁偏置下,等离子体激元粒子的相反暗共振在相反方向上移动,并产生极其敏感的法拉第旋转区域。我们发现,在无损的类银粒子的磁化暗共振可以提供超过20度的旋转下的磁场的顺序为1-2特斯拉,表现出磁等离子体激元活动,是2-3个数量级大于在传统的等离子体激元粒子相同的材料。

英文摘要:

We examine the efficacy of Dark-mode plasmonics as a platform for enhanced magneto-optics. Dark-mode of a small particle consists of two co-existing equal-intensity and mutually opposing dipolar excitations. Each of these two opposing dipoles may even resonate at or near the dark-mode frequency, but the net dipole moment vanishes due to the mutual cancelation between the opposing dipoles. We show that application of external magnetic bias may alleviate the intense destructive interference. Furthermore, under external magnetic bias the opposing dark-resonances of a plasmonic particle shift in opposite directions and create a region of extremely sensitive Faraday rotation. We show that the magnetized dark resonance in lossless Ag-like particle may provide more than 20 degrees rotation under magnetic fields of the order of 1-2 Tesla, exhibiting magneto-plasmonic activity that is 2-3 orders of magnitude larger than that observed in conventional plasmonic particle of the same material.

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