Fully controllable multichannel waveguides induced by counterpropagating Bessel beams.

Area of Science:

• Nonlinear optics
• Photorefractive materials
• Waveguide fabrication

Background:

• Photorefractive crystals are key for nonlinear optical applications.
• Bessel beams (BBs) offer unique propagation characteristics.
• Controlling light propagation is crucial for optical interconnects.

Purpose of the Study:

• To theoretically analyze photo-induced waveguides formed by two incoherent counter-propagating Bessel beams.
• To demonstrate the tunability and control over waveguide characteristics.
• To explore applications in optical interconnects and computing.

Main Methods:

• Theoretical analysis of waveguiding structures.
• Utilizing two incoherent counter-propagating Bessel beams in a biased photorefractive crystal.
• Optimizing parameters like truncation, Bessel order, and beam misalignment.

Main Results:

• Demonstrated adressable channels and tunable guiding structures through BB cross-coupling.
• Tailored waveguide characteristics including output number, intensity, and channel spacing.
• Designed tunable Y-couplers, optical splitters (up to five outputs), and star couplers.
• Investigated stability, identifying thresholds for complex dynamics like spatiotemporal chaos.

Conclusions:

• Bessel beam interactions provide a versatile platform for creating complex, controllable optical waveguides.
• The findings pave the way for advanced all-optical interconnects and novel optical computing architectures.
• The study highlights opportunities for active components in optical telecommunications.