Conventionally, for modelling in-line holograms of systems with high numerical apertures and spherical illumination, the samples are considered as an ensemble of point sources. The in-line hologram is the result of the amplitude superposition of the multiple spherical wavefronts. Albeit simple, this approach limits the shapes of the objects that can be modelled and the computation time rises as the complexity of the sample. In this work, it is presented an alternative approach to model in-line holograms of samples with any shape or size for system with any numerical aperture. The method uses Bluestein´s approach to discrete Fourier transforms.
© 2010 Optical Society of AmericaPDF Article