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 12.768Å that is bigger than that in GGG (12.384Å) and closer to that in BIG (12.626Å). We demonstrate feasibility of integration lanthanum gallium garnet with a giant Faraday rotator Bi3Fe5O12 in magneto-optical photonic crystals. Heteroepitaxial Bi3Fe5O12(1.9μm)∕La3Ga5O12(300nm)∕GGG(111) structures show Faraday rotation as high as 5.74deg∕μm compared to 5.46deg∕μm in BIG/GGG at λ=655nm. Fitting LGG reflectivity spectra to Fresnel formulas yields LGG refractive index no=1.981 compared to 1.963 in GGG at 655nm. Dispersion of LGG refraction index follows Sellmeier formula no2=1+2.77∕[1−(143nm∕λ)2] in the range from 400nm to 1000nm.
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Khartsev et al. (2005) studied this question.
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