Circular Displacement Current Induced Anomalous Magneto‐Optical Effects in High Index Mie Resonators
Circular Displacement Current Induced Anomalous Magneto‐Optical Effects in High Index Mie Resonators
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DOI：
10.1002/lpor.202200067
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发表时间：
2021-08
影响因子：
11
通讯作者：
Shuang Xia;D. Ignatyeva;Qing Liu;Hanbin Wang;Weihao Yang;J. Qin;Yiqin Chen;H. Duan;Yi Luo;O. Novák;M. Veis;L. Deng;V. Belotelov;L. Bi
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作者：
Shuang Xia;D. Ignatyeva;Qing Liu;Hanbin Wang;Weihao Yang;J. Qin;Yiqin Chen;H. Duan;Yi Luo;O. Novák;M. Veis;L. Deng;V. Belotelov;L. Bi
介电Mie纳米谐振器在纳米尺度上表现出强烈的光-物质相互作用，可能使光子器件具有新的功能，如强烈的磁光效应。然而，到目前为止，大多数报道都集中在传统磁光效应的增强上。在高折射率对比度的Si/Ce：YIG/YIG/SiO_2 Mie腔中观察到了反常磁光效应。特别是在S偏振入射下，横向磁组态的光强出现了6.4%的巨调制度，这在平面磁光薄膜中是不存在的。在纵向磁结构中观察到了透射光偏振的大旋转，比平面磁光薄膜高出两个数量级。这些现象是由于在Mie谐振器中激发磁谐振时产生的独特的圆形位移电流局部改变了电场方向所致。这项工作表明，在全介质磁光Mie谐振器和亚表面中，基于复模分布的光偏振控制是一个未知的领域。
Dielectric Mie nanoresonators showing strong light–matter interaction at the nanoscale may enable new functionality in photonic devices, such as strong magneto‐optical effects. However, most reports so far have been focused on the enhancement of conventional magneto‐optical effects. Here, anomalous magneto‐optical effects are observed in high‐index‐contrast Si/Ce:YIG/YIG/SiO2 Mie resonators. In particular, giant modulation of light intensity in transverse magnetic configuration up to 6.4% under s‐polarized incidence appears, which is non‐existent in planar magneto‐optical thin films. A large rotation of transmitted light polarization in longitudinal magnetic configuration is also observed, which is two orders of magnitude higher than for planar magneto‐optical thin films. These phenomena are originated from the unique circular displacement current when exciting magnetic resonances in the Mie resonators, which change the electric field direction locally. This work indicates an uncharted territory of light polarization control based on complex modal profiles in all‐dielectric magneto‐optical Mie resonators and metasurfaces.