Abstract
Reflection micro-Fresnel lenses and their application to an integrated optical-disk pick-up are proposed. Theoretical analysis indicates that the optical characteristics of reflection micro-Fresnel lenses can be improved compared with a conventional transmission micro-Fresnel lens. These reflection micro-Fresnel lenses were fabricated using electron-beam lithography and exhibited diffraction-limited focusing characteristics with 71% high efficiency. The pick-up has a folded optical path and includes a beam splitter integrated with thin film components, such as a reflection elliptical micro-Fresnel lens and a quadrant photodetector. The reflection elliptical micro-Fresnel lens in the pick-up exhibited excellent astigmatic characteristics in good agreement with theoretical results, and a focus error signal was also detected.
