Simple model for orthogonal and angled coupling in dielectric-plasmonic waveguides

Area of Science:

• Photonics and Nanophotonics
• Waveguide Theory
• Plasmonics

Background:

• Dielectric waveguides and plasmonic waveguides are key components in integrated optics.
• Efficiently coupling light between these waveguide types is crucial for advanced photonic devices.
• Existing coupling methods face limitations in efficiency and parameter flexibility.

Purpose of the Study:

• To investigate and optimize coupling schemes between dielectric slab and plasmonic slot waveguides.
• To analyze both orthogonal and angled coupling configurations.
• To identify parameters for achieving high transmission efficiencies in dielectric-plasmonic interconnects.

Main Methods:

• Numerical simulations of waveguide coupling.
• Analytical modeling of coupling mechanisms.
• Systematic variation of geometric and material parameters.
• 2D and 3D calculations to assess coupling efficiencies.

Main Results:

• High orthogonal coupling efficiencies achieved (up to 78% in 2D, 54% in 3D).
• Angled coupling demonstrated even higher efficiencies (up to 86% in 2D, 61% in 3D).
• Analytic models explain observed trends in transmission efficiency.
• Angled coupling is effective for large dielectric waveguides at the phase-matching angle.

Conclusions:

• Angled plasmonic coupling offers superior performance for dielectric-plasmonic interconnects.
• The study provides insights for designing efficient and versatile photonic devices.
• Results pave the way for new applications in integrated photonics across various materials and geometries.