Action of optical forces on inhomogeneous anisotropic particles

  • Andrey V. Novitsky Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; DTU Fotonik, Technical University of Denmark, 343 Ørsteds Plads, Kgs. Lyngby DK-2800, Denmark
  • Richard J. Alvarez Rodriguez Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus
  • Vladimir M. Galynsky Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

Abstract

Optical forces and torques exerted on inhomogeneous anisotropic spherical and cylindrical particles by a couple of plane electromagnetic waves are calculated. The optical forces are computed in dipole approximation using the closedform expressions for particle polarizabilities and numerically taking into consideration the higher-order multipole moments. Wecompare these calculation techniques and demonstrate their agreement in the region of dipole approximation. Conditions for pulling inhomogeneous particles by means of the light beam without intensity gradient are revealed. Thecomparison between homogeneous and inhomogeneous spherical particles is carried out. It is found that the scatterer inhomogeneity shifts the multipole resonances providing one more way for controlling value and direction of the optical force. Spin torque is calculated in the dipole approximation. We show that it does not vanish for non-linear polarization of the incident wave both in the case of spherical and cylindrical inhomogeneous particle. Theresults obtained in this work can be applied for designing new types of dynamical metamaterials, as well as for describing of movement of complex objects in optical tweezers.

Author Biographies

Andrey V. Novitsky, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus; DTU Fotonik, Technical University of Denmark, 343 Ørsteds Plads, Kgs. Lyngby DK-2800, Denmark

doctor of science (physics and mathematics), docent; professor at the department of theoretical physics and astrophysics, faculty of physics, Belarusian State University, and senior researcher at the metamaterials group, DTU Fotonik, Technical University of Denmark

Richard J. Alvarez Rodriguez, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

postgraduate student at the department of theoretical physics and astrophysics, faculty of physics

Vladimir M. Galynsky, Belarusian State University, 4 Niezaliežnasci Avenue, Minsk 220030, Belarus

PhD (physics and mathematics); associate professor at the department of theoretical physics and astrophysics, faculty of physics

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Published
2019-01-20
Keywords: electromagnetic waves, optical forces, light scattering, Mie coefficients, polarizabilities, multipoles
Supporting Agencies The authors acknowledge financial support from the Belarusian Republican Foundation for Fundamental Research (grant No. Ф16Р-049).
How to Cite
Novitsky, A. V., Rodriguez, R. J. A., & Galynsky, V. M. (2019). Action of optical forces on inhomogeneous anisotropic particles. Journal of the Belarusian State University. Physics, 2, 97-106. Retrieved from https://journals.bsu.by/index.php/physics/article/view/491
Issue
No 2 (2018): Journal of the Belarusian State University. Physics
Section
Physics of Electromagnetic Phenomena

Copyright (c) 2018 Journal of the Belarusian State University. Physics

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