Optical orbital angular momentum single-pixel imaging technology

Compared with using area array detectors in 2D imaging, computational imaging technology is based on the collected object features and reconstructs the target image through numerical calculation, which greatly expands the imaging range of traditional optics and can break through the limitations of imaging dimension, diffraction limit and imaging speed in traditional imaging. Single-pixel imaging, as a new type of computational imaging technology, can compress 2D images into 1D detection sequences that change over time through structured light coding. The single-pixel imaging system has a simple structure and mainly consists of a structured light modulation module and a single-pixel detection module. The performance of these two directly determines the various indicators of single-pixel imaging. At present, the structures of single-pixel modulation mainly include Hadamar basis, Fourier basis and wavelet basis. These bases have achieved good results as modulation patterns. Optical vortex is a special type of beam with a helical wavefront. Each photon in the beam carries orbital angular momentum and has a higher degree of freedom in information modulation compared to traditional lasers. The application of optical vortex beams as the modulation substrate for single-pixel imaging can further expand the application of single-pixel imaging. This paper studies the single-pixel two-dimensional complex amplitude imaging technology based on optical vortex beam, analyzes the theoretical basis of this technology, verifies the feasibility of this technology through numerical simulation, and achieves good results. The relevant research results can promote the research of new computational imaging technologies.