Holographic superresolution using spatial light modulator

Abstract

This paper describes a technique of superresolution using a reflective mode spatial light modulator, a coherent source of light, and a transmission mode object placed in the input plane of an imaging system, in particular we are using for the demonstration a 4f system. The spatial light modulator (SLM) enables for creating tilted plane wave illumination and it also permits adding constant phases of 0, π/2, 3π/2 and π. The angle of illumination created by the SLM is defined according to the dimension of aperture placed at the Fourier plane of 4f optical system. For each defined angle of illumination created by the SLM four holograms corresponding to the transmission mode object are recorded. This system is capable of retrieving phase and amplitude information of the images, corresponding to each impinging illumination. By simply adding these complex images a super resolved image is obtained.