Optimal Nanoparticle Forces, Torques, and Illumination Fields
Name
Optimal Nanoparticle Forces, Torques, and Illumination Fields.pdf
Description
Accepted version
Size
3.69 MB
Format
Adobe PDF
Checksum (MD5)
5127154c8f445e61e21a7b8fd0b3b5e2
Author(s)
Liu, Yuxiang
Fan, Lingling
Lee, Yoonkyung E.
Fang, Nicholas X.
Johnson, Steven G
Miller, Owen D.
Date Issued
December 2018
Journal
ACS Photonics
Publisher
American Chemical Society (ACS)
Citation
Liu, Yuxiang et al. "Optimal Nanoparticle Forces, Torques, and Illumination Fields." ACS Photonics 6, 2 (February 2019): 395–402. © 2018 American Chemical Society.
Version
Author's final manuscript
Abstract
A universal property of resonant subwavelength scatterers is that their optical cross-sections are proportional to a square wavelength, λ 2 , regardless of whether they are plasmonic nanoparticles, two-level quantum systems, or RF antennas. The maximum cross-section is an intrinsic property of the incident field: plane waves, with infinite power, can be decomposed into multipolar orders with finite powers proportional to λ 2 . In this article, we identify λ 2 /c and λ 3 /c as analogous force and torque constants, derived within a more general quadratic scattering-channel framework for upper bounds to optical force and torque for any illumination field. This framework also solves the reverse problem: computing globally optimal "holographic" incident beams, for a fixed collection of scatterers. We analyze structures and incident fields that approach the bounds, which for wavelength-scale bodies show a rich interplay between scattering channels, and we show that spherically symmetric structures are forbidden from reaching the plane-wave force/torque bounds. This framework should enable optimal mechanical control of nanoparticles with light. Keywords: optomechanics; optical force; optical torque; illumination fields; fundamental limits
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Department of Mathematics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1021/acsphotonics.8b01263
