Shape-Controllable Piano-Convex Lenses With Enhanced Transmittance Via Electrowetting On A Nanotextured Dielectric

Millimetre-scale piano-convex lenses with controllable focal lengths are presented via electrowetting UV-curable polymer droplets on a nanotextured dielectric. A large range of numerical aperture is achieved. Such piano-convex lenses can be peeled off and transferred to other substrates. The lenses with nanocavities on the bottom surfaces exhibit enhanced transmittance.