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Related Experiment Video

Updated: Jun 19, 2026

Fabrication and Operation of a Nano-Optical Conveyor Belt
11:10

Fabrication and Operation of a Nano-Optical Conveyor Belt

Published on: August 26, 2015

An optical conveyor for molecules.

Franz M Weinert1, Dieter Braun

  • 1Physics Department, Ludwig Maximilians Universität München, Center for Nanoscience, Amalienstrasse 54, 80799 München, Germany.

Nano Letters
|October 8, 2009
PubMed
Summary
This summary is machine-generated.

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Researchers developed an optical conveyor to trap biomolecules in water, overcoming limitations of surface immobilization. This method enables prolonged observation and single-molecule studies in their native environment.

Area of Science:

  • Biophysics
  • Atomic Physics
  • Nanotechnology

Background:

  • Trapping single ions in vacuum enables precise atomic physics spectroscopy.
  • Confinement of biological molecules in bulk water is challenging due to weak forces.
  • Surface immobilization of molecules often impairs their biological function.

Purpose of the Study:

  • To develop a method for optically trapping biological molecules in bulk water.
  • To overcome limitations of current molecule confinement techniques.
  • To enable prolonged observation and manipulation of individual biomolecules.

Main Methods:

  • Utilized a bidirectional flow combined with perpendicular thermophoretic molecule drift in a toroidal geometry.
  • Created a microscale optical conveyor belt for molecule accumulation.

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Last Updated: Jun 19, 2026

Fabrication and Operation of a Nano-Optical Conveyor Belt
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Fabrication and Operation of a Nano-Optical Conveyor Belt

Published on: August 26, 2015

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
08:40

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

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06:53

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Published on: November 18, 2022

  • Demonstrated dynamic relocation of the trap without microfluidics or surface modifications.

    • Main Results:

    • Achieved a hundredfold excess accumulation of 5-base DNA within seconds.
    • Observed exponential scaling of trapped DNA concentration with length.
    • Reached trapping potential depths of 14 kT for 50-base DNA molecules.

    Conclusions:

    • The optical conveyor provides a novel, non-invasive method for trapping biomolecules in bulk water.
    • This technique facilitates enhanced diffusion-limited reactions and cellular signaling studies.
    • Enables prolonged observation of individual biomolecules and advances single-molecule chemistry.