Strong optical force acting on a dipolar particle over a multilayer substrate.

Area of Science:

• Photonics and Nanotechnology
• Plasmonics
• Optical Forces

Background:

• Optical forces on nanoparticles are generally insufficient for practical manipulation.
• Particle-substrate interactions can influence optical forces.
• Resonant phenomena are key to amplifying physical effects.

Purpose of the Study:

• To demonstrate a mechanism for significantly enhancing optical forces on nano-sized particles.
• To explore resonant particle-substrate coupling for amplified optical manipulation.
• To investigate the role of multilayer substrates in enhancing optical forces.

Main Methods:

• Theoretical modeling of optical forces.
• Numerical simulations of particle-substrate interactions.
• Analysis of effective polarizability and plasmon modes.

Main Results:

• A novel mechanism for enhancing optical forces via resonant particle-substrate coupling was identified.
• The resonance is linked to the singular behavior of particle polarizability near a metal-dielectric-metal substrate.
• The phenomenon correlates with the excitation of a flat-band plasmon mode.

Conclusions:

• Enhanced optical forces can be achieved through specific particle-substrate resonant coupling.
• Metal-dielectric-metal multilayer substrates support unique plasmon modes crucial for this enhancement.
• This approach offers potential for advanced nanoparticle manipulation techniques.