Abstract
Digital Lensless Holographic Microscopy (DLHM), or lensless imaging, is an affordable computational imaging approach that reconstructs in-focus images of biological samples directly from their recorded diffraction patterns, eliminating the need for traditional lenses. Commonly, DLHM systems use a spherical wavefront emitted from a point source to directly illuminate a sample placed at any distance between the point source and the camera. One of the main limitations of current DLHM systems is their reduced imaging volume, which is defined by the illumination cone and the sensor size. In this work, we design a freeform-based microlens array to create an array of spherical point sources, enlarging the native sample volume of DLHM system, without sacrificing its spatial resolution.