Method for measuring light field distribution and device therefor

A method for measuring the light field distribution, comprising steps of:

• stably levitating particles by an optical trap;
• moving the optical trap to bring the particles levitated close to a light field to be measured, collecting scattering beam of the particles at different positions in a three-dimensional space of the light field to be measured by a photodetector;
• calculating the light field distribution of the light field to be measured according to the scattered beam intensity, which is proportional to the light intensity at the position;
• wherein the signal collected by the photodetector is the scattering beam of the light field to be measured by the particle, and does not include the scattered beam of trapping beam by the particle.
• wherein the photodetector converts the light intensity to be measured scattered light by particle into the physical quantity directly related to the light intensity, including light intensity, optical power and brightness.
• wherein the particles scan the light field to be measured point by point, and the measurement spatial resolution of the light field to be measured is equal to a length of the scanning interval.