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Colloidal rods in optical potential energy landscapes
- Source :
- Journal of Physics D: Applied Physics. 52(2)
- Publication Year :
- 2018
-
Abstract
- We study the static and dynamic behaviour of colloidal rods in an optical potential energy landscape. We explore the stable states of a colloidal rod in a single optical trap close to a flat wall. Here, two metastable states are observed, horizontal and vertical, both of which experience a parabolic potential energy landscape. Next we place a colloidal rod into a one-dimensional sinusoidal optical potential energy landscape and introduce a constant driving velocity. When driven below the critical velocity, the particle is confined to a single potential energy minimum of the optical landscape and the equilibrium position of a particle is investigated. The equilibrium position of a rod is found to vary substantially from that of a sphere, due to the drag coefficient of a rod being highly dependent on its proximity to an optical trap. The driving velocity is increased to enable the particle to traverse the periodic landscape and above the critical velocity, the average particle velocity increases as the square root of the driving velocity. When introducing oscillations to the driving velocity we observe dynamic mode locking and characterise the nature of synchronised motion of the rod-like particles.
- Subjects :
- Materials science
Acoustics and Ultrasonics
genetic structures
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
Critical ionization velocity
01 natural sciences
Potential energy
Molecular physics
Rod
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Condensed Matter::Soft Condensed Matter
Nonlinear system
Mode-locking
Optical tweezers
Excited state
0103 physical sciences
sense organs
010306 general physics
0210 nano-technology
Energy (signal processing)
Subjects
Details
- ISSN :
- 13616463 and 00223727
- Volume :
- 52
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Journal of Physics D: Applied Physics
- Accession number :
- edsair.doi.dedup.....27a5f1cc7491b917a6ed2b19455757aa