In July 2021, Nakano laboratory’s paper, “Optimization based on the condition number of the speckle patterns in single-pixel imaging using optical phased arrays”, was published in Japanese Journal of Applied Physics.
Single-pixel imaging provides numerous advantages over the conventional pixelated-array imaging as it paved the way to operate at a wider range of wavelengths. Optical phased arrays (OPAs) have been recently used as fast and compact devices to generate the random illumination patterns required for this type of imaging. In this work, we investigate optimal tuning of these speckle patterns generated by an OPA for single-pixel imaging, and we employ the condition number of the illumination patterns matrix as a figure of merit for their evaluation. We show that the quality of the reconstructed image is greatly enhanced by minimizing the condition number of the illumination patterns matrix, which suppresses the effect of noise on the quality of the image.