title: Variable aperture stop based on the design of a single chamber silicone membrane lens with integrated actuation.
abstract: In this Letter we report on the fabrication and testing of an extremely thin variable aperture stop based on the design of a single chamber adaptive membrane lens with integrated actuation. The aperture consists of a ring-shaped piezoelectric bending actuator with an elastic silicone membrane in the center. The formed cavity is filled with a nontransparent fluid and sealed with a glass platelet. In a voltage range up to 80 V, an opening of the aperture of 4.55 mm in diameter is obtained. The transmission in comparison to a standard mechanical aperture stop is maximum 6% lower.
authors.affiliation: Laboratory for Microactuators, Department of Microsystems Engineering - IMTEK, University of Freiburg, Georges-Koehler-Allee 102, 79110 Freiburg, Germany. jan.draheim@imtek.uni‐freiburg.de
authors.forename: Jan
authors.initials: J
authors.lastname: Draheim
authors.forename: Tobias
authors.initials: T
authors.lastname: Burger
authors.forename: Jan G
authors.initials: JG
authors.lastname: Korvink
authors.forename: Ulrike
authors.initials: U
authors.lastname: Wallrabe