Dependence of the imaging properties of the liquid lens with variable focal length on membrane thickness.

This paper presents the influence of membrane thickness on imaging properties of membrane liquid lenses with variable focal length. Approximate formulas for varying thickness of spherically and parabolically deformed membrane were derived, which allows us to determine their influence on quality of imaging properties of a membrane liquid lens. Furthermore, formulas for wave spherical aberration calculation of a membrane and liquid lens body were derived. It has been shown that the influence of membrane thickness and its changes on wave spherical aberration is negligible from a practical point of view.