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Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Optical bistability driven by the light-induced forces between metal nanoparticles.

Sergey V Perminov¹, Vladimir P Drachev, Sergey G Rautian

¹A.V. Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia. serge@isp.nsc.ru

|December 17, 2008

Summary

Motion can induce optical bistability in plasmon-coupled metal nanoparticle dimers. This phenomenon, driven by colloidal forces, occurs without material nonlinearity, offering new possibilities for optical devices.

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Area of Science:

Plasmonics
Nanophotonics
Optical physics

Background:

Optical bistability is a key phenomenon in nonlinear optics, typically requiring high light intensities or nonlinear materials.
Metal nanoparticles exhibit unique optical properties due to surface plasmon resonance.
Controlling optical properties through mechanical motion is an emerging area of research.

Purpose of the Study:

To demonstrate motion-induced optical bistability in a metal nanoparticle system.
To investigate the role of plasmon coupling and colloidal forces in achieving this effect.
To show that optical bistability can be achieved without relying on material nonlinearity.

Main Methods:

Fabrication of a metal nanoparticle dimer system.
Utilizing surface plasmon resonance and colloidal forces for particle binding.
Inducing motion in the nanoparticle dimer to observe changes in optical response.
Characterizing the optical properties of the system under varying conditions.

Main Results:

Observed optical bistability in the metal nanoparticle dimer system.
Demonstrated that the bistability is induced by the motion of the dimer.
Confirmed that the effect is independent of material nonlinearity, relying instead on plasmon coupling and dispersion forces.
Showcased a tunable optical response through controlled motion.

Conclusions:

Motion-induced optical bistability is achievable in plasmon-coupled nanoparticle dimers.
This effect offers a novel pathway for optical switching and modulation without nonlinear materials.
The findings open avenues for developing new optical devices based on mechanical control of plasmonic properties.