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Updated: Jul 10, 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

An integrated optics microfluidic device for detecting single DNA molecules.

Jeffrey R Krogmeier¹, Ian Schaefer, George Seward

¹US Genomics Inc., 12 Gill Street, Suite 4700, Woburn, MA 01801, USA. jkrogmeier@usgenomics.com

|November 22, 2007

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This study presents a novel microfluidic device for high-throughput single DNA molecule detection. It utilizes integrated optics, enabling reproducible and accessible single molecule detection (SMD) without complex equipment.

Area of Science:

Biophotonics
Microfluidics
Molecular Biology

Background:

Single molecule detection (SMD) is crucial for understanding biological processes.
Traditional SMD methods often require expensive and complex optical setups.
There is a need for more accessible and affordable SMD technologies.

Purpose of the Study:

To develop a fluorescence-based integrated optics microfluidic device for high-throughput single DNA molecule detection.
To demonstrate that SMD can be achieved without conventional high numerical aperture objective lenses and sub-micron positioning systems.
To showcase the use of readily manufacturable optical components in microfluidic devices.

Main Methods:

Integration of microfluidics for DNA stretching with plano-aspheric refractive lens (illuminator) and parabolic reflective mirror (collector) for fluorescence detection.

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Utilized standard manufacturing techniques for optical component fabrication and assembly.

Proof-of-principle experiment using intercalated lambda-phage DNA molecules in a mixed elongational-shear microflow.

Main Results:

The device achieved reproducible single DNA molecule detection in a high-throughput manner.
Demonstrated successful detection and sizing of individual lambda-phage DNA molecules with a signal-to-noise ratio of 9.9 +/-1.0.
The optical resolution was characterized by a 2.0 micrometer diffraction-limited spot size.

Conclusions:

The developed integrated optics microfluidic device offers an accessible and affordable platform for single molecule applications.
Standard manufacturing processes can be leveraged for creating advanced microfluidic-based SMD systems.
This approach simplifies SMD, potentially broadening its applicability in research and diagnostics.