Abstract
In this paper, we introduce a new method to realize the separation of waveguide modes in photonic crystal waveguides by controlling the position and polarization of the dipole sources. Our study shows that the waveguide modes in the transversal channel and longitudinal channel can be manipulated, respectively, by the dipole sources placed within the corresponding channels. Based on this discovery, we may further adjust the dipole sources in the transversal (longitudinal) channel individually and separate the zeroth order and the first order modes to propagate towards the preassigned channels. Compared with the former schemes to realize the mode separation by changing the structure, our method is more intuitive, convenient, and flexible.
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