Birefringent channel waveguides defined by impurity-induced superlattice disordering

Kapon, E.; Stoffel, N. G.; Dobisz, E. A.; Bhat, R.
February 1988
Applied Physics Letters;2/1/1988, Vol. 52 Issue 5, p351
Academic Journal
The waveguiding characteristics of GaAs/AlGaAs channel waveguides defined by silicon-induced superlattice disordering were investigated at 1.15 μm wavelength. These waveguides guide laterally only TE-polarized light. Because of the birefringence of the superlattice core of the waveguide, only the TE mode experiences a positive refractive index step between the unmixed and disordered superlattices. The TM mode, on the other hand, experiences a negative refractive index step resulting in antiguiding. The operation of these waveguides as efficient waveguide polarizers is demonstrated.


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