Enhancement of the Faraday Effect and Magneto-optical Figure of Merit in All-Dielectric Metasurfaces
Enhancement of the Faraday Effect and Magneto-optical Figure of Merit in All-Dielectric Metasurfaces
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DOI：
10.1021/acsphotonics.1c01692
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发表时间：
2022-02
期刊：
影响因子：
7
通讯作者：
Shuang Xia;D. Ignatyeva;Qing Liu;J. Qin;Tongtong Kang;Weihao Yang;Yiqin Chen;H. Duan;Longjiang Deng;Di Long;M. Veis;V. Belotelov;Lei Bi
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文献类型：
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作者：
Shuang Xia;D. Ignatyeva;Qing Liu;J. Qin;Tongtong Kang;Weihao Yang;Yiqin Chen;H. Duan;Longjiang Deng;Di Long;M. Veis;V. Belotelov;Lei Bi
全介质超颖表面是下一代平面光子器件的理想候选材料。磁光（MO）全介质超颖表面是特别有吸引力的，由于其增强的MO响应在亚波长尺度。在本文中，我们报道了一种基于Ce：YIG薄膜和二维硅纳米谐振器阵列的MO全介质超颖表面。在1370 nm波长下，器件的法拉第效应和MO优值（FOM）比裸Ce：YIG薄膜提高了4倍。高的法拉第旋转（FR）和FOM是由光和磁性物质之间的相互作用时间的增加引起的，这由在激发混合Mie共振波导模式时Ce：YIG膜内部的局部场增加来指示。同时增强的FR和FOM使得介电MO超颖表面成为自由空间MO器件如MO传感器、MO调制器和非互易光子器件的有希望的候选者。
All-dielectric metasurfaces are promising candidates for the next-generation planar photonic devices. Magneto-optical (MO) all-dielectric metasurfaces are particularly attractive due to their enhanced MO response at the subwavelength scale. In this paper, we report a MO all-dielectric metasurface based on a Ce:YIG thin film and a two-dimensional array of the silicon nanoresonators. Compared to a bare Ce:YIG film, the device shows a four times enhancement of the Faraday effect and the MO figure of merit (FOM) at 1370 nm wavelength. The high Faraday rotation (FR) and FOM are caused by the increase in the interaction time between light and magnetic matter which is indicated by the local field increase inside the Ce:YIG film when exciting the hybrid Mie resonance-waveguide modes. Simultaneously enhanced FR and FOM make the dielectric MO metasurfaces promising candidates for free-space MO devices such as MO sensors, MO modulators, and nonreciprocal photonic devices.