Apparatus for optically rotating microscopic objects

Details Apparatus for optically rotating microscopic objects Apparatus for optically rotating microscopic objects

2007-02-06

2007-02-06

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Reexamination Certificate

active

10451576

ABSTRACT:
Apparatus for and a method of rotating microscopic objects uses a beam of electromagnetic radiation. A microscopic, non-circularly symmetric distribution of electro-magnetic radiation is projected on to a region containing an object to be rotated so as to cause photons in the beam to refract around the objects. Rotating means then rotate that distribution and so rotate the objects. The distribution may be formed on the interference pattern between a beam having a Laguerre-Gaussian wave fronts and either a plane wave or a further Laguerre-Gaussian beam of opposite helicity.

REFERENCES:
Trapping and manipulation of low-index particles in a two-dimensional interferometric optical trap, MacDonald et al, Optics Letters, Jun. 2001, pp. 863-865.
The angular momentum of light: optical spanners and the rotational frequency shift, Padgett et al, Optical and Quantum Electronics, 1999, 1-12.
O'Neil, A. T. and Padgett, M. J., “Three dimensional optical confinement of micro-sized metal particles and the decoupling of the spin and orbital angular momentum within an optical spanner,” Optics Communications, 185, pp. 139-143 (2000).
Simpson, N. B., Allen, L., and Padgett, M. J., “Optical Tweezers and optical spanners with Laguerre-Gaussian modes,” Journal of Modern Optics, vol. 43, No. 12, 2485-2491 (1996).

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