Tunable polymer lens

TLDR

The paper introduces a solid‑state variable‑focal‑length lens. The lens achieves tunable focus by compressing a polymer‑gel reservoir that deforms an elastomeric membrane, with a fabrication process that allows power customization and shape measured by surface profiling. The lens’s focal length can be reversibly altered by up to 1.9×, with calculated back focal lengths matching experimental data.

Abstract

A new type of solid-state variable focal length lens is described. It is based on shape changes in an elastomeric membrane driven by compression of a reservoir of a polymer gel. A novel fabrication process based on individual lens components allows for customization of lens power based on the desired application. The lens shape as a function of applied compressive strain is measured using direct surface profile measurements. The focal length of a solid state lens was reversibly changed by a factor of 1.9. Calculated back focal lengths of the lens were consistent with experimental measurements.