Abstract: In this paper, we aim to design and propose a novel structure for all-optical
half subtractor based on the photonic crystal. The structure includes two optical switches,
one power splitter, and one power combiner. The optical switches are made of the
resonant rings which use the nonlinear rods for dropping operation. The footprint of the
designed structure is about 602 μm2 that is more compact than one in most works.
Furthermore, despite some works, the input signals are the same in the phase angle and
the optical power. Also, each input signal is applied to one port while this issue has not
been considered in some works. Plane wave expansion and finite difference time domain
methods are used to calculate the band diagram and simulation of the optical wave
propagation throughout the structure, respectively. The maximum obtained rise time of
all states of the proposed device is just about 1.4 ps. Besides, the presented structure is
capable of working at the third communication window so it can be matched with optical
fiber transmission systems. پرونده مقاله