An Ultra-Compact Circulator Using Two-Dimensional Magneto-Optical Photonic Crystals

We present a design of on-chip optical circulator that is ultra-compact, with a footprint on a single-wavelength scale, using rotating non-reciprocal states in a two-dimensional magneto-optical photonic crystal. Both analytic theory and detailed finite difference time domain simulations are presented to illustrate the operating principle of the device.