High Transmission All-Optical Combinational Logic Circuits Based on a Nanoring Multi-Structure at 1.31 µm

Area of Science:

• Optoelectronics
• Nanophotonics
• Plasmonics

Background:

• Plasmonic logic gates offer potential for miniaturized optical computing.
• Existing designs face challenges in integration and performance.

Purpose of the Study:

• To design and analyze combinational logic gates using a novel insulator-metal-insulator (IMI) nanoring plasmonic waveguide configuration.
• To realize multiple logic functions (half adder, full adder, subtractors, comparator) within a single structure.

Main Methods:

• Utilizing constructive and destructive interference of optical signals.
• Simulations performed using the finite element method (FEM).
• Performance evaluated through transmission spectrum, contrast loss (CL), insertion loss (IL), modulation depth (MD), and contrast ratio (CR).

Main Results:

• Achieved a maximum transmission of 232% for the full adder logic gate.
• Modulation depth (MD) exceeded 90% across all designed plasmonic combinational logic circuits.
• Operates at a resonance wavelength of 1.310 μm with a transmission threshold of 0.35.

Conclusions:

• The proposed IMI nanoring plasmonic waveguide design is effective for creating high-performance plasmonic combinational logic gates.
• This work contributes significantly to the development of photonic circuits, nanocircuits, all-optical systems, and optical communication systems.