Laguerre-Gaussian beams as an optical pipeline: Optical forces and intra-fluid micro particle movements

Abstract

In this study, particle motion with low thermal conductivity, such as carbon nanoclasts aerosols, is simulated when irradiated by an optical tube such as Laguerre- Gaussian and Bessel-Gaussian beams. Opticall forces due to light radiation to the particle include the radiation and photophoretic forces that result from the transmission of the photon's momentum to the particle and its surroundings. Here, these forces are generally calculated for radiation an m-charge Laguerre-Gaussian beam, LG0m, on a spherical micro particle. Longitudinal and transverse component of radiation and photophoretic forces for radiation of LG0m with m = 0, 1 and 2 are derived. LG0m beams have a ring-shaped intensity profile when m > 0. The particles can be guided into these pipeline beams on the optical axis based on the particle's size and the beam properties. The optical guidance can be in the direction of the beam or opposite. Some particles are also trapped completely.