Abstract
In this study, a novel approach is described for developing an electro-optic decoder utilizing a combination of photonic crystals and a graphene stack. The decoder structure comprises three main components: silicon waveguides, stacks, and one-dimensional photonic crystals. To create favorable interferences similar to reflectors based on Bragg layers, a one-dimensional array of air holes is designed in parallel with a waveguide. Within this array, a graphene-SiO2 stack is incorporated, enabling the creation of a tunable stop-band frequency filter within the wavelength range of 1489 to 1492 nm. This tunability is achieved by altering the graphene refractive index according to the applied chemical potential. By controlling the optical wave transmission through the waveguides, the transmission from the input to the output ports is effectively regulated. Simulation results indicate that decoding operation can be achieved by applying chemical potentials of 0.1 eV and 0.9 eV. The normalized power levels for logic states 1 and 0 are equal to 48% and 6.2%, respectively, resulting in a contrast ratio of 8.89 dB. Additionally, the compact size of the designed structure, occupying only 99 µm2 of space, demonstrates its advantages over previous electro-optic works, particularly in terms of realizing optical circuits.
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This work was supported by Shahid Chamran University of Ahvaz, grant number SCU.EE1402.672.
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Conceptualization: [Maryam Shahbaznia, Mohammad Soroosh], Methodology: [Maryam Shahbaznia, Mohammad Soroosh, Mohammad Javad Maleki], Formal analysis and investigation: [Maryam Shahbaznia, Jabbar Ganji], Writing-original draft preparation: [Maryam Shahbaznia, Mohammad Javad Maleki]; Writing-review and editing: [Mohammad Soroosh, Jabbar Ganji, Mohammad Javad Maleki], Supervision: [Mohammad Soroosh].
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Soroosh, M., Shahbaznia, M., Maleki, M.J. et al. Designing a compact photonic crystal decoder using graphene-SiO2 stack. Opt Quant Electron 56, 828 (2024). https://doi.org/10.1007/s11082-024-06703-1
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DOI: https://doi.org/10.1007/s11082-024-06703-1