We wish to fabricate a planar waveguide for light of λ0 = 0.9μm in
Ga(1−x)AlxAs. It will be a double layer structure on a GaAs substrate. The top
(waveguiding) layer will be 3.0μm thick with the composition Ga0.9Al0.1As.
The lower (confining) layer will be 10μm thick and have the composition
Ga0.17Al0.83As. How many modes will this structure be capable of waveguiding?
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