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Title: Optical torque from enhanced scattering by multipolar plasmonic resonance
Authors: Lee, YE
Fung, KH 
Jin, D
Fang, NX
Issue Date: 2014
Source: Nanophotonics, 2014, v. 3, no. 6, p. 343-350
Abstract: We present a theoretical study of the optical angular momentum transfer from a circularly polarized plane wave to thin metal nanoparticles of different rotational symmetries. While absorption has been regarded as the predominant mechanism of torque generation on the nanoscale, we demonstrate numerically how the contribution from scattering can be enhanced by using multipolar plasmon resonance. The multipolar modes in non-circular particles can convert the angular momentum carried by the scattered field and thereby produce scattering-dominant optical torque, while a circularly symmetric particle cannot. Our results show that the optical torque induced by resonant scattering can contribute to 80% of the total optical torque in gold particles. This scattering-dominant torque generation is extremely mode-specific, and deserves to be distinguished from the absorption-dominant mechanism. Our findings might have applications in optical manipulation on the nanoscale as well as new designs in plasmonics and metamaterials.
Keywords: Light scattering
Multipolar resonance
Optical angular momentum
Optical manipulation
Optical torque
Surface plasmon
Publisher: De Gruyter
Journal: Nanophotonics 
ISSN: 2192-8606
EISSN: 2192-8614
DOI: 10.1515/nanoph-2014-0005
Rights: © 2014 Science Wise Publishing & De Gruyter
The following publication Lee, Yoonkyung E., Fung, Kin Hung, Jin, Dafei and Fang, Nicholas X.. "Optical torque from enhanced scattering by multipolar plasmonic resonance" Nanophotonics, vol. 3, no. 6, 2014, pp. 343-350 is available at
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