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A highly efficient spatial beam splitter based on coupled cavity waveguide with surface taper modification structure is proposed. The beam splitter is analyzed with the finite difference time domain numerical method. By modifying the number of the coupled multi-channel taper cylinders along horizontal direction and the number of waveguides along vertical direction, the spatial profile of the electric field can be varied and the direction of Poynting vector can be changed.
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Xu et al. (2010) studied this question.
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