Optical trapping force estimation for the trapped nanowire in optical tweezer by Shack Hartmann sensor

摘要

Measurement of trapping force with Shack Hartmann sensor, which is done in this paper, offers many advantages. It opens a way for phase and force measurement at the same time. In line alignment, correcting optical beam aberration, OPD and nonlinear refractive index measurement of the trapped particle is easily achievable with phase measurement. The new method is as accurate as old methods and has high precision since it can be evaluated by a single measurement of Shack Hartmann sensor in millisecond. Also mapping laser beam spot in trapping site may lead to further discovery in the potential well studies.