Affiliation of Author(s):[1]Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610065, Sichuan, Peoples R China;[2]Nankai Univ, Tianjin Key Lab Optoelect Sensor & Sensing Networ, Inst Modern Opt, Tianjin 300350, Peoples R China
Journal:OPTICS EXPRESS
Key Words:Iron - Laser pulses - Magnetooptical effects - Permittivity - Polarization - Refractive index - Saturation magnetization - Single crystals - Terahertz spectroscopy - Terahertz waves - Thick films - Time domain analysis - Yttrium iron garnet
Abstract:The wafer-scale La:YIG single crystal thick films were fabricated on a three-inch gadolinium gallium garnet (GGG) substrate by liquid phase epitaxy method. The terahertz (THz) optical and magneto-optical properties of La:YIG film were demonstrated by THz time domain spectroscopy (THz-TDS). The results show that a high refractive index of approximately 4.09 and a low absorption coefficient of 10-50 cm(-1) from 0.1 to 1.6 THz for this La:YIG film. Moreover, the THz Faraday rotation effect of La:YIG film was measured by the orthogonal polarization detection method in THz-TDS system, which can be actively manipulated by a weak longitudinal magnetic field of up to 0.155 T. With 5 samples stacked together, the Faraday rotation angle varies linearly from -15 degrees to 15 degrees, and the Verdet constant of La:YIG is about 100 degrees/mm/T within the saturation magnetization. This magneto-optical single crystal thick film with large area shows low loss, high permittivity and strong magneto-optical effect in the THz regime, which will be widely used in magneto-optical polarization conversion, nonreciprocal phase shifter and isolator for THz waves. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Document Type:Article
Volume:28
Issue:14
Page Number:21062-21071
ISSN No.:1094-4087
Translation or Not:no