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Title: Rotation and Negative Torque in Electrodynamically Bound Nanoparticle Dimers

Abstract

Here, we examine the formation and concomitant rotation of electrodynamically bound dimers (EBD) of 150nm diameter Ag nanoparticles trapped in circularly polarized focused Gaussian beams. The rotation frequency of an EBD increases linearly with the incident beam power, reaching high mean values of ~ 4kHz for a relatively low incident power of 14mW. Using a coupled-dipole/effective polarizability model, we reveal that retardation of the scattered fields and electrodynamic interactions can lead to a “negative torque” causing rotation of the EBD in the direction opposite to that of the circular polarization. This intriguing opposite-handed rotation due to negative torque is clearly demonstrated using electrodynamics-Langevin dynamics simulations by changing particle separations and thus varying the retardation effects. Finally, negative torque is also demonstrated in experiments from statistical analysis of the EBD trajectories. These results demonstrate novel rotational dynamics of nanoparticles in optical matter using circular polarization and open a new avenue to control orientational dynamics through coupling to interparticle separation.

Authors:
 [1]; ORCiD logo [1];  [2];  [1]
  1. The Univ. of Chicago, Chicago, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
OSTI Identifier:
1422775
Grant/Contract Number:  
[AC02-06CH11357]
Resource Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
[ Journal Volume: 17; Journal Issue: 11]; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; angular momentum; negative optical torque; optical torque; optical trapping; Optical tweezers; plasmonic nanoparticles

Citation Formats

Sule, Nishant, Yifat, Yuval, Gray, Stephen K., and Scherer, Norbert F. Rotation and Negative Torque in Electrodynamically Bound Nanoparticle Dimers. United States: N. p., 2017. Web. doi:10.1021/acs.nanolett.7b02196.
Sule, Nishant, Yifat, Yuval, Gray, Stephen K., & Scherer, Norbert F. Rotation and Negative Torque in Electrodynamically Bound Nanoparticle Dimers. United States. doi:10.1021/acs.nanolett.7b02196.
Sule, Nishant, Yifat, Yuval, Gray, Stephen K., and Scherer, Norbert F. Fri . "Rotation and Negative Torque in Electrodynamically Bound Nanoparticle Dimers". United States. doi:10.1021/acs.nanolett.7b02196. https://www.osti.gov/servlets/purl/1422775.
@article{osti_1422775,
title = {Rotation and Negative Torque in Electrodynamically Bound Nanoparticle Dimers},
author = {Sule, Nishant and Yifat, Yuval and Gray, Stephen K. and Scherer, Norbert F.},
abstractNote = {Here, we examine the formation and concomitant rotation of electrodynamically bound dimers (EBD) of 150nm diameter Ag nanoparticles trapped in circularly polarized focused Gaussian beams. The rotation frequency of an EBD increases linearly with the incident beam power, reaching high mean values of ~ 4kHz for a relatively low incident power of 14mW. Using a coupled-dipole/effective polarizability model, we reveal that retardation of the scattered fields and electrodynamic interactions can lead to a “negative torque” causing rotation of the EBD in the direction opposite to that of the circular polarization. This intriguing opposite-handed rotation due to negative torque is clearly demonstrated using electrodynamics-Langevin dynamics simulations by changing particle separations and thus varying the retardation effects. Finally, negative torque is also demonstrated in experiments from statistical analysis of the EBD trajectories. These results demonstrate novel rotational dynamics of nanoparticles in optical matter using circular polarization and open a new avenue to control orientational dynamics through coupling to interparticle separation.},
doi = {10.1021/acs.nanolett.7b02196},
journal = {Nano Letters},
number = [11],
volume = [17],
place = {United States},
year = {2017},
month = {9}
}

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