Preparation of magneto-optic single-mode buried channel waveguides of lanthanum- and gallium-substituted yttrium iron garnet

• Published in: Japanese Journal of Applied Physics Vol. 34; no. 6A; pp. 3113 - 3119
• Main Authors: SUGIMOTO, N, KATOH, Y, TATE, A, SHINTAKU, T, TERUI, H, SHIBUKAWA, A
• Format: Journal Article
• Language: English
• Published: Tokyo Japanese journal of applied physics 1995
• Subjects: Applied sciences; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Integrated optics. Optical fibers and wave guides; Optical and optoelectronic circuits; Iron Yttrium Oxides Mixed; Insulation; Scanning electron microscopy; Insulator; Function block diagram; Propagation; Epitaxy; Refractive index; Optical waveguides; Growth from liquid; Buried channel; Frequency shift; Single mode waveguide; Garnets; Coupling coefficient; Thermal effects; Growth mechanism; Birefringence; Ion beam etching; Transmission loss; Magnetooptical effects; Mode conversion; Production process; Power spectrum
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/JJAP.34.3113

Magneto-optic single-mode buried channel waveguides are prepared using lanthanum- and gallium-substituted yttrium iron garnet [(La, Ga):YIG] liquid-phase-epitaxial film. The film growth conditions, film properties and the core ridge fabrication method are described. The refractive index of the film is controlled with the film growth temperature. The core ridge size is well controlled using ion beam etching. The obtained waveguides provide low loss coupling with a silica-based waveguide, which is a platform waveguide for a hybrid optical integrated circuit. Magneto-optic mode conversion is observed in a weak applied magnetic field, and the conversion efficiency R max and isolation ratio are evaluated. The relationship between R max and the stress-induced birefringence is discussed.