Enhanced optical forces in 2D hybrid and plasmonic waveguides.

Area of Science:

• Photonics and optical engineering
• Materials science

Background:

• Optical gradient force is crucial for manipulating micro/nanoparticles.
• Conventional dielectric waveguides exhibit limited optical force due to weaker field confinement.

Purpose of the Study:

• To investigate and quantify optical gradient force enhancement in 2D hybrid and plasmonic waveguides.
• To compare the force enhancement across different waveguide geometries and materials.

Main Methods:

• Numerical simulations of optical field distribution and force calculations in various waveguide structures.
• Comparative analysis of force magnitudes in dielectric, hybrid, and plasmonic waveguides.
• Evaluation of geometric effects (rectangular, circular, triangular) on force enhancement.

Main Results:

• Optical force enhanced by over an order of magnitude in hybrid and plasmonic waveguides compared to dielectric ones.
• Strong optical field confinement at waveguide surfaces drives the force enhancement.
• Rectangular cross-section plasmonic waveguides exhibit the strongest optical force.
• Plasmonic enhancement is nonresonant, enabling broadband applications.

Conclusions:

• Hybrid and plasmonic waveguides offer superior optical gradient force capabilities.
• Waveguide geometry, particularly rectangular, significantly impacts force magnitude.
• The nonresonant nature of plasmonic enhancement makes it versatile for diverse optical manipulation tasks.