Digital micro-optics is a particular field within the more general field of optical engineering, particular in the way such optics are designed (seldom through ray tracing) and how they are fabricated (often at the wafer scale). This book, written by Google engineer Bernard Kress, reviews the broad range of micro-optics used today in industry and research (refractives, GRIN, hybrid, diffractives, holographic, nano-optics). It provides quick access to optimal design and modeling techniques, both analytic and numeric. This book also reviews the various fabrication techniques used to produce micro-optics, as well as the requirements to bridge the gap between design and fabrication. The optical engineer interested in quick but concise answers to questions ranging from the design and modeling to the fabrication and mass replication of micro-optics will particularly enjoy this book.