As2S3/Sr(Ti0.7Co0.3)O3 and As2S3/Sr(Ti0.6Fe0.4)O3 strip-loaded waveguides for integrated magneto-optical isolator applications
2009
Sr(Ti 0.6 Fe 0.4 )O 3 (STF) and Sr(Ti 0.7 Co 0.3 )O 3 (STC) room-temperature ferromagnetic oxides were grown epitaxially on
LaAlO3(001), (LaSr)(AlTa)O 3 (001) and Si (001) substrates. Both materials were demonstrated to be magneto-optically
active, and more optically transparent at 1550nm wavelength compared with other non-garnet ferromagnetic materials.
As 2 S 3 /STF and As 2 S 3 /STC strip-loaded waveguides were fabricated on epitaxial STF or STC films grown on LSAT (001)
substrates using thermal evaporation and lift-off processing. The absorption of STF at 1550 nm was measured by
ellipsometry and by optical transmission spectrum measurements of the As 2 S 3 /STF waveguides, which gave similar
results. A novel design for a Non-Reciprocal Phase Shift (NRPS) strip-loaded waveguide using chalcogenide glass (ChG)
as the guiding layer is proposed. The NRPS and figure of merit of these waveguides are simulated. The ChG strip-loaded
waveguide structure shows advantages both in fabrication and device performance according to the simulation results.
Our study suggests the possibility of magneto-optical magneto-optical isolators monolithically integrated on a silicon
platform.
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