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Design Plasmonic Optical 4 × 2 Encoder Based on 2D Photonic Crystal Ring Resonator

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Abstract

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.

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Authors and Affiliations

  1. Department of Electrical and Electronics Engineering, Shiraz University of Technology, Shiraz, Iran

    Samaneh Hamedi, Roozbeh Negahdari & Hamid Reza Ansari

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  1. Samaneh Hamedi
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  2. Roozbeh Negahdari
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  3. Hamid Reza Ansari
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Samaneh hamedi (40%), Roozbeh negahdari (35%), and Hamidreza Ansari (35%).

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Correspondence to Samaneh Hamedi.

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Hamedi, S., Negahdari, R. & Ansari, H.R. Design Plasmonic Optical 4 × 2 Encoder Based on 2D Photonic Crystal Ring Resonator. Plasmonics 16, 1983–1990 (2021). https://doi.org/10.1007/s11468-021-01461-2

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