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Related Experiment Video

Updated: Jul 1, 2026

Optical Trapping of Nanoparticles

Optical Trapping of Nanoparticles

Published on: January 15, 2013

Creating stable trapping force and switchable optical torque with tunable phase of light.

Fan Nan¹, Xiao Li², Shuailong Zhang³

¹Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Science Advances

|November 18, 2022

Summary

Researchers demonstrate switchable optical rotation of nanoparticle micromotors using programmed light phase. This method enables precise control over micro-object rotation direction and speed without intensity gradients.

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Area of Science:

Optics and Photonics
Nanotechnology
Microfluidics

Background:

Light-induced rotation of microscopic objects is key for developing micromotors.
Controlling position and rotation direction simultaneously without intensity gradients is a significant challenge.
Existing methods often rely on light's intensity gradient or specific light-matter interactions.

Purpose of the Study:

To achieve stable optical trapping and switchable optical rotation of nanoparticle (NP)-assembled micromotors.
To demonstrate control over rotation direction and magnitude using programmed light phase.
To explore the use of phase gradients in light fields for optical manipulation.

Main Methods:

Utilizing a circularly polarized flat-top laser beam with imprinted customized phase gradients.
Trapping and assembling metal NPs into reconfigurable clusters using these phase gradients.
Modulating phase gradients to control optical torque direction and magnitude.

Main Results:

Stable optical trapping and reconfigurable cluster formation of metal NPs achieved.
Direction-switchable and magnitude-tunable optical torque demonstrated on the NP clusters.
Successful manipulation of micromotors using programmed phase gradients in a light field.

Conclusions:

The study presents a novel method for reversible optical torque generation in micro/nanomotors.
Programmed phase gradients in light fields offer precise control over optical trapping and manipulation.
This technique provides new insights into utilizing the phase of light for advanced optical control.