[24p-E303-1~10] CS.3 3.11 フォトニック構造・現象、3.12 ナノ領域光科学･近接場光学のコードシェアセッション

▲ [24p-E303-1] Design of an All-dielectric Magneto-optical Metasurface Exhibiting a Giant Faraday Rotation

〇(D)Siyuan Gao^1,2、Yasutomo Ota³、Tianji Liu¹、Iwamoto Satoshi^1,2 (1.RCAST, Univ. Tokyo、2.IIS, Univ. Tokyo、3.Keio Univ.)

キーワード：magneto-optical effect, metasurface, electromagnetically induced transparency

Employing magneto-optical (MO) effects is a straightforward approach to realize nonreciprocal optical devices, such as isolators. However, in most bulk materials, the MO Faraday rotation is rather small especially in the optical domain, hampering the downsizing of MO devices. Consequently, the miniaturization of MO devices using optical resonances has attracted much attention. Recently, an all-dielectric MO metasurface has been numerically demonstrated to exhibit a large enhancement of Faraday rotation ( within a 260 nm-thick BIG (Bismuth Iron Garnet) thin film) as well as high light transmission under an electromagnetically induced transparency (EIT) condition [1]. However, the demonstrated is still too small to realize efficient thin-film optical isolators (which require ). In this work, we report a MO nanostructure that achieves at telecom wavelengths with a BIG thickness of 320 nm.