In this work, we used the concept of Photonic Crystals (PhCs) for the computational
simulation of two all-optical logic gates, the NOT and NAND gates. These new all-optical
structures consist of a Photonic Crystal Ring Resonator (PCRR) in two dimensions (2-D) made
of dielectric rods silicon (Si) in air substrate. The Plane Wave Expansion (PWE) and the Finite
Difference Time Domain (FDTD) methods are used to analyze the behavior of these structures.
The PWE method is used to calculate the Photonic Band Gap (PBG) of the PhC structures, that
is from 0.2654 to 0.3897 (a / λ). The square lattices of logic gates (NOT and NAND) designed
are implemented on the operational wavelength of 1700 nm. The simulation results show that
the proposed structures are potential candidates for the design of ultra-fast optical digital
circuits and highly advantageous with high transmission power, simple design, and are strongly
applicable to the manufacture of Photonic Integrated Circuits (PICs) due to their simple
structure and its clear operating principle.
KEYWORDS: All-Optical NOT Logic Gate, Photonic Crystal Ring Resonator, Finite
Difference Time Domain, Contrast Ratio.
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