Bespoke optical springs and passive force clamps from shaped dielectric particles

Simpson, S. H., Phillips, D. B., Carberry, D. M. and Hanna, S. (2013) Bespoke optical springs and passive force clamps from shaped dielectric particles. Journal of Quantitative Spectroscopy & Radiative Transfer, 126 91-98. doi:10.1016/j.jqsrt.2012.10.014


Author Simpson, S. H.
Phillips, D. B.
Carberry, D. M.
Hanna, S.
Title Bespoke optical springs and passive force clamps from shaped dielectric particles
Journal name Journal of Quantitative Spectroscopy & Radiative Transfer   Check publisher's open access policy
ISSN 0022-4073
1879-1352
Publication date 2013-09
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.jqsrt.2012.10.014
Volume 126
Start page 91
End page 98
Total pages 8
Place of publication Oxford, United Kingdom
Publisher Pergamon
Collection year 2014
Language eng
Abstract By moulding optical fields, holographic optical tweezers are able to generate structured force fields with magnitudes and length scales of great utility for experiments in soft matter and biological physics. It has recently been noted that optically induced force fields are determined not only by the incident optical field, but by the shape and composition of the particles involved [Gluckstad J. Optical manipulation: sculpting the object. Nat Photonics 2011;5:7–8]. Indeed, there are desirable but simple attributes of a force field, such as orientational control, that cannot be introduced by sculpting optical fields alone. With this insight in mind, we show, theoretically, how relationships between force and displacement can be controlled by optimizing particle shapes. We exhibit a constant force optical spring, made from a tapered microrod and discuss methods by which it could be fabricated. In addition, we investigate the optical analogue of streamlining, and show how objects can be shaped so as to reduce the effects of radiation pressure, and hence switch from non-trapping to trapping regimes.
Keyword Optical trapping
Dielectric cylinder
Optical spring
Force clamping
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Non HERDC
 
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