Paper: Tunable aspherical lenses (Scientific Report)

We demonstrate that liquid-liquid interface can be electrostatically modulated into a tunable and ideal aspherical lens by applying electric field to a drop entrapped in an aperture, controlled hydrostatically. This is achieved by manipulating the meniscus shape by simultaneously altering the electrostatic force and laplace pressure (backpressure). Electrostatic pressure alters the curvature of initial spherical drop, consequently changing marginal and paraxial focal lengths and thus reducing the longitudinal spherical aberration (LSA). Such adaptive lenses are not only tunable in focal length and LSA, but in the process, LSA is suppressed, yielding perfect lens and consequently achieving enhanced optical performance. We confirm our findings by optically imaging a square grid.

The research will be published in Scientific reports.