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Non-harmonic potential of a single beam optical trap.
A C Richardson1, S N S Reihani, L B Oddershede
1The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark.
Optics Express
|October 1, 2008
Summary
Researchers explored optical trap potentials beyond the central region using a novel method. They discovered the potential stiffens significantly at extreme positions, challenging existing theories.
Area of Science:
- Physics
- Optical trapping
- Nanotechnology
Background:
- Optical traps use laser beams to confine microscopic objects.
- The potential energy landscape of optical traps is typically assumed to be harmonic near the center.
Purpose of the Study:
- To experimentally investigate the optical trapping potential beyond the commonly assumed harmonic region.
- To determine the behavior of trapped particles at extreme displacements.
Main Methods:
- Development and application of a new experimental method to displace trapped objects to unprecedented distances.
- Analysis of the trapping potential by forcing objects to extreme positions within a single laser beam optical trap.
Main Results:
- The optical trapping potential was experimentally explored at significantly larger displacements than previously achieved.
- A considerable stiffening of the trapping potential was observed as the trapped object moved to extreme positions.
Conclusions:
- The harmonic approximation of optical trap potentials is limited to a smaller region than previously assumed.
- The observed stiffening at extreme positions indicates that simple Uhlenbeck theories do not adequately describe the full trapping potential.
