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Optical trapping at gigapascal pressures.

Richard W Bowman1, Graham M Gibson, Miles J Padgett

  • 1SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom. richard.bowman@cantab.net

Physical Review Letters
|March 19, 2013
PubMed
Summary
This summary is machine-generated.

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Optical tweezers can now manipulate particles within diamond anvil cells, enabling precise viscosity measurements of materials at extreme pressures. This breakthrough offers absolute viscosity data without atmospheric pressure calibration.

Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Diamond anvil cells (DACs) are crucial for studying material behavior under extreme pressures (hundreds of gigapascals).
  • Direct physical access to samples within pressurized DACs is fundamentally limited.
  • Existing methods for in-situ measurements within DACs often require calibration against atmospheric pressure values.

Purpose of the Study:

  • To develop a novel method for manipulating and probing samples inside diamond anvil cells using optical tweezers.
  • To overcome the geometric constraints of DACs for optical manipulation.
  • To enable absolute viscosity measurements of fluids at high pressures.

Main Methods:

  • Utilized a modified optical tweezers setup with a higher working distance objective lens.

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Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

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Last Updated: May 13, 2026

Optical Trap Loading of Dielectric Microparticles In Air
08:57

Optical Trap Loading of Dielectric Microparticles In Air

Published on: February 5, 2017

Optical Trapping of Nanoparticles
13:39

Optical Trapping of Nanoparticles

Published on: January 15, 2013

  • Trapped and manipulated micron-sized transparent beads within the DAC at the laser focus.
  • Measured the viscosity of water at pressures up to 1.3 GPa.

    • Main Results:

    • Successfully demonstrated the manipulation of particles within a DAC using optical tweezers.
    • Achieved absolute viscosity measurements of water at high pressures (up to 1.3 GPa).
    • The technique provides viscosity data independent of atmospheric pressure calibration.

    Conclusions:

    • Optical tweezers offer a powerful tool for in-situ sample manipulation and characterization within diamond anvil cells.
    • This method overcomes previous limitations, enabling absolute and potentially frequency-dependent viscosity measurements.
    • The technique shows promise for studying material properties, including anisotropy, under extreme pressure conditions.