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Title: Pure angular momentum generator using a ring resonator
Authors: Yu, YF
Fu, YH
Zhang, X 
Liu, AQ
Bourouina, T
Mei, T
Shen, ZX
Tsai, DP
Keywords: Electromagnetic fields
Optical resonators
Issue Date: 11-Oct-2010
Publisher: Optical Society of America
Source: Optics express, 11 Oct. 2010, v. 18, no. 21, p. 21651-21662 How to cite?
Journal: Optics express 
Abstract: This paper reports a pure angular momentum generator using a ring resonator surrounded by a group of nano-rods. The evanescent waves of the circulating light in the ring are scattered by the nano-rods and generate a rotating electromagnetic field, which has only angular momentum but no linear momentum along the axis of rotation. The angular order is determined by the difference between the order of Whispering Gallery mode and the number of the rods, the rotating frequency is equal to the light frequency divided by the angular order. The maximum amplitude of the rotating electromagnetic fields can be 10 times higher than the amplitude of the input field when there are 36 rods (R[sub rod] = 120 nm, n[sub r] = 1.6). The pure angular momentum generator provides a new platform for trapping and rotation of small particles.
ISSN: 1094-4087
DOI: 10.1364/OE.18.021651
Rights: © 2010 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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