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.
Funder
National Natural Science Foundation of
China