Optical Logic Gates Excited by a Gauss Vortex Interference Beam Based on Spatial Self-Phase Modulation in 2D MoS₂

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Vortex beams with optical orbital angular momentum are crucial for high-speed optical communication.
• Low-dimensional materials show promise for all-optical signal processing and computing.
• Spatial self-phase modulation in materials can be controlled by light beam properties.

Purpose of the Study:

• To investigate the use of molybdenum disulfide (MoS2) dispersions for creating optical logic gates.
• To explore the modulation of spatial self-phase modulation patterns by input beam characteristics.
• To implement fundamental logic operations (AND, OR, NOT) using optical signals.

Main Methods:

• Utilized MoS2 dispersions to generate spatial self-phase modulation patterns.
• Modulated these patterns using the initial intensity, phase, and topological charge of a Gauss vortex superposition interference beam.
• Defined input signals based on beam properties and output signals from pattern intensity at specific checkpoints.

Main Results:

• Demonstrated that spatial self-phase modulation patterns in MoS2 are controllable by input beam parameters.
• Successfully implemented two sets of optical logic gates (AND, OR, NOT) by setting intensity thresholds.
• Showcased the feasibility of using these patterns for all-optical logic operations.

Conclusions:

• Optical logic gates based on MoS2 dispersions offer a reliable method for all-optical signal processing.
• These gates have significant potential for applications in all-optical networks and computing.
• The study highlights the utility of light-matter interactions in low-dimensional materials for advanced optical technologies.