Direct measurement of axial optical forces.

摘要: Direct measurement of optical forces based on recording the change momentum between in- and outgoing light does not have specific requirements particle size or shape, beam shape. Thus this approach overcomes many limitations force measurements position measurements, which require frequent calibration. In work we validate achievable accuracy for direct in axial direction a single tweezers setup, numerical simulations experimental investigations situations, where true is known. We find that typical situations good with an error less than 1 % maximum can be achieved, independent refractive index, provided total amount scattered backward also taken into account, easy to accomplish experimentally. Due inherent shape independence method, these findings support it provides accurate results 3D particles arbitrary