Driving corrugated donut rotors with Laguerre-Gauss beams

Loke, Vincent L. Y., Asavei, Theodor, Stilgoe, Alexander B., Nieminen, Timo A. and Rubinsztein-Dunlop, Halina (2014) Driving corrugated donut rotors with Laguerre-Gauss beams. Optics Express, 22 16: 19692-19706. doi:10.1364/OE.22.019692


Author Loke, Vincent L. Y.
Asavei, Theodor
Stilgoe, Alexander B.
Nieminen, Timo A.
Rubinsztein-Dunlop, Halina
Title Driving corrugated donut rotors with Laguerre-Gauss beams
Journal name Optics Express   Check publisher's open access policy
ISSN 1094-4087
Publication date 2014-08-11
Year available 2014
Sub-type Article (original research)
DOI 10.1364/OE.22.019692
Open Access Status DOI
Volume 22
Issue 16
Start page 19692
End page 19706
Total pages 15
Place of publication Washington DC United States
Publisher Optical Society of America
Collection year 2015
Language eng
Formatted abstract
Tightly-focused laser beams that carry angular momentum have been used to trap and rotate microrotors. In particular, a Laguerre-Gauss mode laser beam can be used to transfer its orbital angular momentum to drive microrotors. We increase the torque efficiency by a factor of about 2 by designing the rotor such that its geometry is compatible with the driving beam, when driving the rotation with the optimum beam, rather than beams of higher or lower orbital angular momentum. Based on Floquet's theorem, the order of discrete rotational symmetry of the rotor can be made to couple with the azimuthal mode of the Laguerre-Gauss beam. We design corrugated donut rotors, that have a flat disc-like profile, with the help of the discrete dipole approximation and the T-matrix methods in parallel with experimental demonstrations of stable trapping and torque measurement. We produce and test such a rotor using two-photon photopolymerization. With a rotor that has 8-fold discrete rotational symmetry, an outer radius of 1.85 μm and a hollow core radius of 0.5 μm, we were able to transfer approximately 0.3 h̄ per photon of the orbital angular momentum from an LG04 beam.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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