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Abstract
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In this paper, a novel simple structure for all optical photonic crystal based logic gate is
presented. The structure is based on coupling the input signals to a combiner and thresholding the
output signal of the combiner. The unit cell of the structure is designed to achieve band gap around
the communication wavelength (i.e., 1.5 μm). The presented structure reveals low cross couple between
gate inputs. The structure has no symmetry between inputs, which enables realization of the gate on
small footprint photonic crystal. The structure offers 0.1 μm bandwidth around the communication
wavelength. The footprint of the structure is 25.59 μm × 25.31 μm.
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