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Updated: May 22, 2026

A Microfluidic-based Hydrodynamic Trap for Single Particles

A Microfluidic-based Hydrodynamic Trap for Single Particles

Published on: January 21, 2011

Microfluidic sorting with blinking optical traps.

R Dasgupta¹, R S Verma, P K Gupta

¹Laser Biomedical Applications and Instrumentation Division, Raja Ramanna Center for Advanced Technology, Indore, India. raktim@rrcat.gov.in

|May 26, 2012

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Blinking optical traps can selectively trap larger colloidal spheres from mixed populations. Smaller spheres escape the trap during off periods, enabling size-based sorting of microparticles.

Area of Science:

Colloidal science
Optical trapping
Microparticle manipulation

Background:

Optical traps are crucial for manipulating microscopic particles.
Selective trapping of particles based on size is a significant challenge in microfluidics and materials science.
Existing methods often struggle with efficient sorting of mixed populations.

Purpose of the Study:

To demonstrate a novel method for selective size-based trapping of colloidal spheres using blinking optical traps.
To investigate the influence of trap periodicity on selective trapping efficiency.
To experimentally validate the sorting of different-sized silica spheres.

Main Methods:

Utilizing blinking optical traps with controlled periodicity.
Analyzing the escape dynamics of colloidal spheres of different sizes from the optical trap.

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Last Updated: May 22, 2026

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Scanning an array of blinking traps to move larger spheres.

Experimentally demonstrating sorting of 1 µm and 2 µm diameter silica spheres.

Main Results:

Selective trapping of larger colloidal spheres was achieved by optimizing trap periodicity.
Smaller, more agile spheres were observed to escape the trap during the off-period.
Successful sorting of 1 µm and 2 µm diameter silica spheres was experimentally demonstrated.
The proposed method enables directed movement of larger spheres within a mixed population.

Conclusions:

Blinking optical traps offer a viable mechanism for size-selective manipulation of colloidal particles.
The periodicity of the blinking trap is a critical parameter for achieving selective trapping.
This technique has potential applications in microfluidic devices for particle sorting and purification.