Análisis teórico de una Pinza óptica en las aproximaciones de Rayleighy Mie para un Haz de Captura Doughnut-Shaped tipo TEM01.Trabajo de grado Universidad de Pamplona.

Abstract

An Optical Tweezer is an instrument that uses a focused highly laser beam to capture and to manipulate micrometric and nanometric objects. From its invention has demonstrated to be a tool of first level for the investigation in several fields as Biology, and the Microbiology amoung others. The prediction of the behavior of the forces present in this phenomenon is a current problem and of continuous evolution, this added to the recent use of beams with optical vortexes that possess exotic properties as the Angular Orbital Moment, with advantages as the manipulation rotacional of the micro captured particles and reduction of the optical damage in biological samples (Opticution), with regard to gradient Optical Tweezer, make the problem even more complex. Therefore, in this work is realized an analysis of the light forces in the optical capture of a dielectric sphere with a beam Laguerre Gaussian mode Doughnut-Shaped type TEM∗ 01 by means of the deduction of mathematical expressions calculated in the approximations of Rayleigh Regime and Mie Regime, in addition, is analyzed the torque due to the transfer at the Orbital Angular Moment of this beam to the micro particle. Finally, is develop a user’s graphical interface in MATLAB that allows the analysis of the forces present in the capture in the approximations of Rayleigh Regime and Mie Regime. Additionally are presents experimentals results of measurement of forces, observation of the torque generated for a beam Laguerre Gaussian, implementation of an optical tweezer obtained in the Optical Trapping Lab-Grup de Biofot´onica (BIOPT), del Departamento de Física Aplicada, de la Facultad de Física de la Universidad de Barcelona, in Barcelona-España.