Heteroepitaxial Bi3Fe5O12/La3Ga5O12 films for magneto-optical photonic crystals

Khartsev, S. I.; Grishin, A. M.
April 2005
Applied Physics Letters;4/4/2005, Vol. 86 Issue 14, p141108
Academic Journal
Epitaxial La3Ga5O12 (LGG) garnet films and Bi3Fe5O12/La3Ga5O12 (BIG/LGG) heteroepitaxial film structures have been synthesized on the Gd3Ga5O12(GGG,111) single crystal. LGG films were grown by pulsed laser deposition technique whereas rf-magnetron sputtering was used to grow BIG films. LGG has a lattice constant 12.768 Å that is bigger than that in GGG (12.384 Å) and closer to that in BIG (12.626 Å). We demonstrate feasibility of integration lanthanum gallium garnet with a giant Faraday rotator Bi3Fe5O12 in magneto-optical photonic crystals. Heteroepitaxial Bi3Fe5O12(1.9 μm)/La3Ga5O12(300 nm)/GGG(111) structures show Faraday rotation as high as 5.74 deg/μm compared to 5.46 deg/μm in BIG/GGG at λ=655 nm. Fitting LGG reflectivity spectra to Fresnel formulas yields LGG refractive index no=1.981 compared to 1.963 in GGG at 655 nm. Dispersion of LGG refraction index follows Sellmeier formula no2=1+2.77/[1-(143 nm/λ)2] in the range from 400 nm to 1000 nm.


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