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<p>This work presents a novel ultra-compact multifunctional all-optical logic gate architecture based on metal-insulator-metal (MIM) plasmonic waveguides integrated with multimode interferometers (MMIs). By exploiting interference effects in a symmetric configuration with four inputs, two as logic operands and two as control signals, the proposed device supports the full suite of fundamental binary logic operations: NOT, OR, AND, NOR, XNOR, NAND, and XOR. The structure operates within the telecommunication <i>C</i>-band (1.5–1.6&#xa0;μm) and achieves logical functions without relying on nonlinear effects, thereby ensuring low power consumption. Finite-difference time-domain (FDTD) simulations demonstrate high extinction ratios (ERs) around 21 to 24 dB, with a minimal footprint of only 6 µm<sup>2</sup>. These results surpass those of previously reported MIM and photonic crystal designs in terms of compactness and performance, underscoring the proposed structure’s potential for future high-density and energy-efficient photonic computing systems.</p>

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Ultra-compact all-optical plasmonic logic gates using metal-insulator-metal waveguides and multimode interferometers

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Monireh-Sadat Miri,
  • Abbas Ghadimi,
  • Behrouz Heidari,
  • Maryam Khoddam

摘要

This work presents a novel ultra-compact multifunctional all-optical logic gate architecture based on metal-insulator-metal (MIM) plasmonic waveguides integrated with multimode interferometers (MMIs). By exploiting interference effects in a symmetric configuration with four inputs, two as logic operands and two as control signals, the proposed device supports the full suite of fundamental binary logic operations: NOT, OR, AND, NOR, XNOR, NAND, and XOR. The structure operates within the telecommunication C-band (1.5–1.6 μm) and achieves logical functions without relying on nonlinear effects, thereby ensuring low power consumption. Finite-difference time-domain (FDTD) simulations demonstrate high extinction ratios (ERs) around 21 to 24 dB, with a minimal footprint of only 6 µm2. These results surpass those of previously reported MIM and photonic crystal designs in terms of compactness and performance, underscoring the proposed structure’s potential for future high-density and energy-efficient photonic computing systems.