Thin-film waveguide magneto-optic isolator

Wolfe, R.; Hegarty, J.; Dillon, J. F.; Luther, L. C.; Celler, G. K.; Trimble, L. E.; Dorsey, C. S.
May 1985
Applied Physics Letters;5/1/1985, Vol. 46 Issue 9, p817
Academic Journal
A thin-film waveguide Faraday rotator which provides nonreciprocal polarization rotation of ±45° for light of wavelength 1.45 µm with an extinction ratio of 500:1 has been demonstrated. This isolator structure makes use of laser annealing to reverse the sublattice magnetization and hence the sign of the Faraday effect in localized regions of a (Bi, Ga) yttrium iron garnet film. A novel geometrical pattern was designed for these regions to overcome the effects of the inherent thin-film birefringence.


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