Shape-controllable piano-convex lenses with enhanced transmittance via electrowetting on a nanotextured dielectric

摘要

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.