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A high extinction ratio (ER) polarization beam splitter with three different multimode interference couplers on InP substrate was designed by a three-dimensional beam propagation method. Simulations show that the polarization ER (PER) is over 34 dB and internal loss is <0.8 dB for both TE and TM polarizations. The PER imbalance between the two polarization states has been reduced to 22 dB. The...
In an infinite periodic PhC slab, due to symmetry considerations, Fano resonances at k=0 completely decouple from the external world and their radiative quality factors become infinite despite lying above the light line. Here, we experimentally demonstrate the existence of such resonances at k∼0.
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