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Updated: May 20, 2026

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Use of Dual Optical Tweezers and Microfluidics for Single-Molecule Studies

Published on: November 18, 2022

Planar optical tweezers using tapered-waveguide junctions.

Hong Cai¹, Andrew W Poon

¹Photonic Device Laboratory, Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China. eeawpoon@ust.hk

|July 25, 2012

Summary

This summary is machine-generated.

We developed planar optical tweezers using silicon nitride waveguides to trap polystyrene particles. The device successfully manipulates particles of 2.2 μm and 1 μm, demonstrating size-dependent trapping capabilities.

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Area of Science:

Photonics and optical engineering
Nanotechnology
Biophysics

Background:

Optical tweezers are essential tools for manipulating microscopic objects.
Existing optical tweezer technologies often require complex setups.
Integrated photonic devices offer potential for miniaturized optical trapping solutions.

Purpose of the Study:

To demonstrate a novel planar optical tweezer system.
To utilize the evanescent field of a silicon nitride waveguide junction for particle manipulation.
To investigate the trapping capabilities for different particle sizes.

Main Methods:

Fabrication of a silicon nitride tapered-waveguide junction.
Integration of the waveguide junction within a fluidic channel.
Experimental trapping of polystyrene particles (2.2 μm and 1 μm).
Numerical modeling to understand trapping mechanisms.

Main Results:

Successful trapping of one 2.2 μm polystyrene particle.
Successful trapping of two 1 μm polystyrene particles.
Demonstration of particle substitution by incoming particles.
Evidence of particle trapping dependency on size and number.

Conclusions:

The silicon nitride tapered-waveguide junction functions as a planar optical tweezer.
The device shows potential for size-selective manipulation of microparticles.
This integrated approach offers a simplified and scalable optical trapping platform.