Computer generated microlens arrays and their application to optical free space switching networks

The application of microlens arrays into optical switching architectures has been addressed. The diffractive and refractive properties of microlens arrays have been demonstrated in their use as efficient optical fan-in/fan-out array generators in the Fourier and image plane respectively. A flexible and scalable approach to the generation of these lens arrays of high quality and uniformity has been detailed. Characterisation of HOECHST AZ4620A resist has resulted in the photolithographic production of multi-level structures of approximated lens profiles, allowing future control of f-numbers and aberrations. This may also be extended to the fabrication of surface relief structures for use as alternative fan-out array generators