Digital encoders are one of the key devices required in optical communication and digital signal processing systems. In this paper, a new photonic crystal structure is used to design all-optical 4 × 2 encoder constructed from GaAs rods with square lattice in the pentane background based on plasmonic effect. Gold rods have also been used at the interface of dielectric rods and lines defect, which create plasmonic properties into the photonic crystal structure. The designed optical device is composed of four input waveguides and two output waveguides with two ring resonators at the resonant wavelength of 1.14 μm with TM polarization. The presented encoder platform has the small size of 19 μm × 33 μm that makes it to integration into compact all-optical processing systems. The encoder operation is simulated and analyzed with numerical finite-difference time-domain (FDTD) method and plane wave expansion (PWE) method. In the proposed structure, we have shown that by selecting the appropriate radius size for the resonant cavities, the desirable wavelength can be obtained. The maximum values of transmission efficiency for the first and second outputs are 82% and 96%, respectively. Resonant cavities are also located in the crystal lattice in such a way that by activating third input, 50% and 48% of the input signal will be obtained in each output ports indicating (1,1) logic state. So the new plasmonic photonic crystal encoder could be future applicable in the field of optical computing.

数字编码器是光通信和数字信号处理系统所需的关键设备之一。本文采用一种新的光子晶体结构，基于等离激元效应，设计了一种在戊烷背景下由具有正方形晶格的GaAs棒构成的全光4×2编码器。金棒还用于介电棒和线路缺陷的界面，这些缺陷会在光子晶体结构中产生等离子体特性。所设计的光学器件由四个输入波导和两个输出波导以及两个环形谐振器组成，两个环形谐振器的共振波长为1.14μm（TM偏振）。提出的编码器平台具有19μm×33μm的小尺寸，使其能够集成到紧凑的全光学处理系统中。通过数值有限差分时域（FDTD）方法和平面波扩展（PWE）方法对编码器的操作进行了仿真和分析。在所提出的结构中，我们已经表明，通过为谐振腔选择合适的半径尺寸，可以获得所需的波长。第一和第二输出的传输效率的最大值分别为82％和96％。谐振腔也以如下方式位于晶格中：通过激活第三输入，将在每个输出端口中获得50％和48％的输入信号，指示（1,1）逻辑状态。因此，新型等离激元光子晶体编码器可能会在光学计算领域中得到应用。我们已经表明，通过为谐振腔选择合适的半径尺寸，可以获得所需的波长。第一和第二输出的传输效率的最大值分别为82％和96％。谐振腔也以如下方式位于晶格中：通过激活第三输入，将在每个输出端口中获得50％和48％的输入信号，指示（1,1）逻辑状态。因此，新型等离激元光子晶体编码器可能会在光学计算领域中得到应用。我们已经表明，通过为谐振腔选择合适的半径尺寸，可以获得所需的波长。第一和第二输出的传输效率的最大值分别为82％和96％。谐振腔也以如下方式位于晶格中：通过激活第三输入，将在每个输出端口中获得50％和48％的输入信号，指示（1,1）逻辑状态。因此，新型等离激元光子晶体编码器可能会在光学计算领域中得到应用。每个输出端口将获得50％和48％的输入信号，指示（1,1）逻辑状态。因此，新型等离激元光子晶体编码器可能会在光学计算领域中得到应用。每个输出端口将获得50％和48％的输入信号，指示（1,1）逻辑状态。因此，新型等离激元光子晶体编码器可能会在光学计算领域中得到应用。