Optical nonreciprocal devices with a silicon guiding layer fabricated by wafer bonding are proposed. The optical nonreciprocal devices are composed of a magneto-optic waveguide with a magnetic garnet/Si/SiO<sub>2</sub> structure. Nonreciprocal characteristics are obtained by an evanescent field penetrating into the upper magnetic garnet cladding layer. Several kinds of the optical nonreciprocal device are investigated with the magneto-optic waveguide and designed at a wavelength of 1.55 μm. As a preliminary experiment, wafer bonding between Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub> and Si was studied. Wafer bonding was successfully achieved with heat treatment at 220 °C in H<sub>2</sub> ambient.
© 2003 Optical Society of America
Hideki Yokoi, Tetsuya Mizumoto, and Yuya Shoji, "Optical Nonreciprocal Devices with a Silicon Guiding Layer Fabricated by Wafer Bonding," Appl. Opt. 42, 6605-6612 (2003)