Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires

Alessia Irrera, Alessandro Magazzù, Pietro Artoni, Stephen H Simpson, Simon Hanna, Philip H Jones, Francesco Priolo, Pietro Giuseppe Gucciardi, Onofrio M. Maragò*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

22 Citations (Scopus)
410 Downloads (Pure)

Abstract

We measure, by photonic torque microscopy, the nonconservative rotational motion arising from the transverse components of the radiation pressure on optically trapped, ultrathin silicon nanowires. Unlike spherical particles, we find that nonconservative effects have a significant influence on the nanowire dynamics in the trap. We show that the extreme shape of the trapped nanowires yields a transverse component of the radiation pressure that results in an orbital rotation of the nanowire about the trap axis. We study the resulting motion as a function of optical power and nanowire length, discussing its size-scaling behavior. These shape-dependent nonconservative effects have implications for optical force calibration and optomechanics with levitated nonspherical particles.

Original languageEnglish
Pages (from-to)4181-4188
Number of pages8
JournalNano Letters
Volume16
Issue number7
Early online date9 Jun 2016
DOIs
Publication statusPublished - 13 Jul 2016

Keywords

  • Brownian motion
  • nonequilibrium dynamics
  • Optical tweezers
  • silicon nanowires

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