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Magneto‐Optical Bi:YIG Films with High Figure of Merit for Nonreciprocal Photonics
Author(s) -
Fakhrul Takian,
Tazlaru Stana,
Beran Lukáš,
Zhang Yan,
Veis Martin,
Ross Caroline A.
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201900056
Subject(s) - yttrium iron garnet , materials science , figure of merit , circulator , optoelectronics , optical isolator , photonics , bismuth , phase shift module , faraday effect , magneto , thin film , waveguide , optics , magnetic field , nanotechnology , insertion loss , electrical engineering , laser , magnet , engineering , quantum mechanics , physics , metallurgy
Thin film magneto‐optical (MO) materials are enablers for integrated nonreciprocal photonic devices such as isolators and circulators. Films of polycrystalline bismuth‐substituted yttrium iron garnet (Bi:YIG) have been grown on silicon substrates and waveguide devices, in which an yttrium iron garnet (YIG) seedlayer is placed either above or below the active Bi:YIG layer to promote crystallization. The films exhibit a high MO figure of merit of up to 769° dB −1 at 1550 nm wavelength. Growth of single phase Bi:YIG on the sidewalls of waveguides is demonstrated, which can be used in nonreciprocal transverse electric (TE)‐mode devices.