Simultaneous trapping of two types of particles by using a focused partially coherent cosine-Gaussian-correlated Schell-model beam

M L Luo and D M Zhao

We numerically study the radiation forces (RFs) of the cosine-Gaussian-correlated Schell-model (CGSM) beam, in which the classic Gaussian degree of coherence is modulated by the cosine function, exerted on a Rayleigh dielectric sphere. By performing calculations, we found that the CGSM beam presents an advantage over the conventional partially coherent cosine-Gaussian beam in which the cosine function is employed for modeling of the spectral density, as the former can simultaneously trap and manipulate two types of particles with different refractive indices, while the latter just traps one kind of particle with high-refractive index, even under the same condition.

DOI