Presentation Information
[9a-N102-10]Fabrication and optical characterization of near infrared metasurfaces based on monocrystalline yttrium iron garnet thin films
〇Siyuan Gao1, Kota Taniguchi1, Yambe Takeru1, Hironobu Yoshimi1, Satoshi Iwamoto2,3, Yasutomo Ota1 (1.Keio Univ., 2.IIS, Utokyo, 3.RCAST, Utokyo)
Keywords:
magneto-optical effect,Monocrsytalline yttrium iron garnet thin film,near infrared metasurfaces
Nanopatterning magneto-optical (MO) materials is a promising route toward compact nonreciprocal photonic devices. Monocrystalline yttrium iron garnet (YIG) and its derivatives are representative transparent MO materials in the near infrared, yet their physical harness and chemical inactivity make nanopatterning extremely challenging. This fabrication challenge has hampered the realization of YIG-based metasurfaces capable of tight light confinement, causing a lag behind recent rapid advances in all-dielectric MO metasurface designs. Previously, a bismuth-substituted YIG (Bi:YIG) metasurface has been demonstrated on a gadolinium gallium garnet (GGG) substrate. However, the small refractive index contrast between YIG and GGG limited the light confinement within the MO layer. In this work, we report the nanofabrication and optical characterization of a MO metasurface based on monocrystalline Bi:YIG prepared on SiO2 operating at near infrared wavelengths.