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Irrera A, Magazzù A, Artoni P, et al. Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires. Nano Lett. 2016;16(7):4181-8doi: 10.1021/acs.nanolett.6b01059.
Irrera, A., Magazzù, A., Artoni, P., Simpson, S. H., Hanna, S., Jones, P. H., Priolo, F., Gucciardi, P. G., & Maragò, O. M. (2016). Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires. Nano letters, 16(7), 4181-8. https://doi.org/10.1021/acs.nanolett.6b01059
Irrera, Alessia, et al. "Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires." Nano letters vol. 16,7 (2016): 4181-8. doi: https://doi.org/10.1021/acs.nanolett.6b01059
Irrera A, Magazzù A, Artoni P, Simpson SH, Hanna S, Jones PH, Priolo F, Gucciardi PG, Maragò OM. Photonic Torque Microscopy of the Nonconservative Force Field for Optically Trapped Silicon Nanowires. Nano Lett. 2016 Jul 13;16(7):4181-8. doi: 10.1021/acs.nanolett.6b01059. Epub 2016 Jun 13. PMID: 27280642.
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Nano Lett. 2016 Jul 13;16(7):4181-8. doi: 10.1021/acs.nanolett.6b01059. Epub 2016 Jun 13.

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

Nano letters

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

Affiliations

  1. CNR-IPCF, Istituto per i Processi Chimico-Fisici , I-98158 Messina, Italy.
  2. MATIS CNR-IMM and Dipartimento di Fisica e Astronomia, Università di Catania , I-95123, Catania, Italy.
  3. Institute of Scientific Instruments of the CAS, v.v.i. Czech Academy of Sciences , 612 64 Brno, Czech Republic.
  4. H. H. Wills Physics Laboratory, University of Bristol , BS8 1TL Bristol, U.K.
  5. Department of Physics and Astronomy, University College London , WC1E 6BT London, U.K.
  6. Scuola Superiore di Catania, Università di Catania , I-95123 Catania, Italy.

PMID: 27280642 DOI: 10.1021/acs.nanolett.6b01059

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.

Keywords: Brownian motion; Optical tweezers; nonequilibrium dynamics; silicon nanowires

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