Journal
OPTICS COMMUNICATIONS
Volume 354, Issue -, Pages 250-255Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2015.06.002
Keywords
Radiation forces; Generalized Multi-Gaussian Schell model beam; Optical trapping
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Funding
- National Natural Science Foundation of China [11274273, 11474253]
- Fundamental Research Funds for the Central Universities [2015FZA3002]
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We numerically investigate the trapping effect of the focused generalized Multi-Gaussian Schell model (GMGSM) beam of the first kind which produces dark hollow beam profile at the focal plane. By calculating the radiation forces on the Rayleigh dielectric sphere in the focused GMGSM beam, we show that such beam can trap low-refractive-index particles at the focus, and simultaneously capture high-index particles at different positions of the focal plane. The trapping range and stability depend on the values of the beam index N and the coherence width. Under the same conditions, the low limits of the radius of low-index and high-index particles for stable trapping are indicated to be different. (C) 2015 Elsevier B.V. All rights reserved.
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