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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 36 — Dec. 20, 2002
  • pp: 7694–7701

Radiation force on a nonlinear microsphere by a tightly focused Gaussian beam

Romeric Pobre and Caesar Saloma  »View Author Affiliations


Applied Optics, Vol. 41, Issue 36, pp. 7694-7701 (2002)
http://dx.doi.org/10.1364/AO.41.007694


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Abstract

We determine the characteristics of the radiation force that is exerted on a nonresonant nonlinear (Kerr-effect) rigid microsphere by a strongly focused Gaussian beam when diffraction and interference effects are significant (sphere radius a ≤ illumination wavelength λ). The average force is calculated from the surface integral of the energy-momentum tensor consisting of incident, scattered, and internal electromagnetic field vectors, which are expressed as multipole spherical-wave expansions. The refractive index of a Kerr microsphere is proportional to the internal field intensity, which is computed iteratively by the Rytov approximation (residual error of solution, 10-30). The expansion coefficients for the field vectors are calculated from the approximated index value. Compared with that obtained in a dielectric (linear) microsphere in the same illumination conditions, we find that the force magnitude on the Kerr microsphere is larger and increases more rapidly with both a and the numerical aperture of the focusing objective. It also increases nonlinearly with the beam power unlike that of a linear sphere. The Kerr nonlinearity also leads to possible reversals of the force direction. The proposed technique is applicable to other types of weak optical nonlinearity.

© 2002 Optical Society of America

OCIS Codes
(190.3270) Nonlinear optics : Kerr effect
(260.1960) Physical optics : Diffraction theory
(290.5850) Scattering : Scattering, particles

History
Original Manuscript: April 22, 2002
Revised Manuscript: September 12, 2002
Published: December 20, 2002

Citation
Romeric Pobre and Caesar Saloma, "Radiation force on a nonlinear microsphere by a tightly focused Gaussian beam," Appl. Opt. 41, 7694-7701 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-36-7694

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