Quantitative determination of the optical properties of phase objects by using a real-time phase retrieval technique

Abstract

The transport-of-intensity equation (TIE) describes a deterministic relation between the intensity distribution in different focal planes and the corresponding phase distribution. A Green's function solution of the TIE is used to retrieve the phase distribution of an object considering specific boundary conditions. This leads to an accurate reconstruction of the properties of phase objects, e.g. the refractive indices and thus the numerical aperture (NA) of optical fibers. The required intensity distributions are captured simultaneously by the use of a multi-camera microscope. The TIE is solved using a computer algorithm, which can be massively parallelized. This offers the application of general purpose computation on graphics processing units (GPGPU). Therefore real-time reconstruction of the phase distribution is possible.

Optimized systems for energy efficient optical tweezing

“…Ray vectors are finally built by tracing intensity values from one axial position to another. A more accurate calculation can be performed via the intensity transport formalism [15]. The ray vectors are the input for the ray optics based force simulation (eq.…”