In this paper, a trifurcation structured optical logic gates is designed based on 2D photonic crystals that is composed of square lattice air holes in silicon. The results of the proposed structure confirm that it could exhibit the optical logic gate functionality of OR, AND, NOR and NAND gates. These gates were designed with three inputs port and single output port. Out of the three inputs, the centre port is considered as the reference input. The inputs are followed by a square shaped resonator design. The bit rate and footprint are calculated for the proposed optical logic gates. The contrast ratio for AND, NAND and NOR gate is 6.15 dB, 5.79 dB and 2.97 dB respectively. Additionally, phase shifts are introduced in the launch field to improve the contrast ratio and it is found that certain logic functions display improved power output. The contrast ratio for AND, OR gate (with 180° phase shift) is 6.52 dB and 10.79 dB, respectively. The footprint for the proposed gate is 424.7 μm. Plane wave expansion and finite difference time domain method are used to calculate the band structure and wave propagation of the structure.

中文翻译：

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基于三叉结构二维光子晶体的光逻辑门设计与分析

在本文中，基于由硅中的方形晶格气孔组成的二维光子晶体设计了一种三叉结构的光逻辑门。所提出的结构的结果证实它可以展示 OR、AND、NOR 和 NAND 门的光逻辑门功能。这些门设计有三个输入端口和一个输出端口。在三个输入中，中心端口被视为参考输入。输入之后是方形谐振器设计。比特率和足迹是为建议的光逻辑门计算的。AND、NAND和NOR门的对比度分别为6.15 dB、5.79 dB和2.97 dB。此外，在发射场中引入了相移以提高对比度，并且发现某些逻辑功能显示出改进的功率输出。AND、OR 门（具有 180° 相移）的对比度分别为 6.52 dB 和 10.79 dB。所提议的栅极的占位面积为 424.7 μm。采用平面波展开法和时域有限差分法计算结构的能带结构和波传播。