Nonreciprocal plasmonics enables giant enhancement of thin-film Faraday rotation
Nonreciprocal plasmonics enables giant enhancement of thin-film Faraday rotation
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DOI：
10.1038/ncomms2609
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发表时间：
2013-03-01
影响因子：
16.6
通讯作者：
Giessen, Harald
中科院分区：
文献类型：
--
作者：
Chin, Jessie Yao;Steinle, Tobias;Giessen, Harald
光的传播通常是相互的。然而，在磁光材料存在的情况下，沿传播方向的静态磁场沿着可以破坏时间反演对称性。磁光材料中的法拉第效应使光的偏振面旋转，并且当光向后行进时，偏振进一步旋转。这适用于光学隔离器，这在光学系统中至关重要。由于可用磁光材料的弱法拉第效应，法拉第隔离器通常体积庞大。集成光学领域的研究不断发展，对薄膜法拉第旋转器和增强法拉第效应提出了更高的要求。在这里，我们报告显着增强的法拉第旋转杂交等离子体与磁光。通过在激光沉积的磁光薄膜上制备等离子体纳米结构，我们的实验中法拉第旋转增强了一个数量级，同时保持了高的透明度。我们阐明了增强的法拉第效应之间的相互作用的等离子体激元和不同的光子波导模式在我们的系统。
Light propagation is usually reciprocal. However, a static magnetic field along the propagation direction can break the time-reversal symmetry in the presence of magneto-optical materials. The Faraday effect in magneto-optical materials rotates the polarization plane of light, and when light travels backward the polarization is further rotated. This is applied in optical isolators, which are of crucial importance in optical systems. Faraday isolators are typically bulky due to the weak Faraday effect of available magneto-optical materials. The growing research endeavour in integrated optics demands thin-film Faraday rotators and enhancement of the Faraday effect. Here, we report significant enhancement of Faraday rotation by hybridizing plasmonics with magneto-optics. By fabricating plasmonic nanostructures on laser-deposited magneto-optical thin films, Faraday rotation is enhanced by one order of magnitude in our experiment, while high transparency is maintained. We elucidate the enhanced Faraday effect by the interplay between plasmons and different photonic waveguide modes in our system.