[23p-A309-1~10] CS.4 Code-sharing Session of 3.10 & 3.11

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)

[23p-A309-6] Design of Hybrid Si-Bi:YIG Metasurfaces Exhibiting Giant Faraday Rotation

〇Siyuan Gao^1,2, Yasutomo Ota³, Tianji Liu⁴, Feng Tian¹, Iwamoto Satoshi^1,2 (1.RCAST, Univ. Tokyo, 2.IIS, Univ. Tokyo, 3.Keio Univ., 4.CIOMP, CAS)

Keywords:

Magneto-optical effect,Hybrid metasurface,Electromagnetically induced transparency

The utilization of magneto-optical (MO) effects offers a promising approach for creating nonreciprocal optical instruments, such as Faraday isolators and circulators. Despite this, the MO effect in most bulk materials is low especially within the optical range, posing significant challenges to the miniaturization of MO devices. Recently, all-dielectric MO metasurfaces (MS) that increase Faraday rotation angle while maintaining high light transmission (T) in an electromagnetically induced transparency (EIT) scenario were numerically demonstrated. However, precise nanopatterning on garnet material is rather challenging, in which the fabrication defects severely impact its optical performance. A hybrid MO MS without nanopattern in MO layer was demonstrated, while the Faraday rotation angle is insufficient for optical isolators (which necessitate ). In this study, we present a design of hybrid MS composed of Si and bismuth substitute iron garnet (Bi:YIG) that immensely enhanced at telecom wavelengths with submicron Bi:YIG thin film.