[14p-2N-1~16] 3.4 Biomedical optics

[14p-2N-11] Simulation of Motion of Nanoparticles Under Scattered Laser Light Pattern

〇Naomichi Yokoi¹, Yoshihisa Aizu² (1.Asahikawa Nat. Col. Tech., 2.Muroran Inst. Tech.)

Keywords:optical manipulation,optical force,nanoparticles

The motion of particles in random potentials occurs in several natural phenomena such as the mobility of organelles within a biological cell. A Brownian particle moving in the random optical potential associated to a speckle pattern, which is a complex interference pattern generated by the scattering of coherent light by a random medium, provides an ideal model system to study such phenomena. Volpe et al. derived so far a theory for analyzing the motion of a Brownian particle in a speckle field and, in particular, they identified its universal characteristic timescale. In the present study, we numerically estimate the Brownian motion of a nanoparticle in a speckle pattern. This theoretical insight permits us to demonstrate that random potentials can be used to control the dynamics of nanoparticles in Brownian motion in a very accurate way, in spite of their intrinsic randomness. Based on this theoretical insight, we demonstrate how speckle light fields can be used to control the anomalous diffusion of a nanoparticle in Brownian motion and to perform some basic optical manipulation tasks such as trapping and guiding.