Tunable-focus microlens arrays on curved surfaces

Difeng Zhu; Chenhui Li; Xuefeng Zeng; Hongrui Jiang
February 2010
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p081111
Academic Journal
We present a microlens array consisting of multiple liquid-based tunable-focus microlenses omnidirectionally fabricated on a hemisphere, resulting in large field of view. Polymer bridge structure is formed between microlenses to reduce the stress and deformation in each lens structure. Each microlens in the array is formed via a water-oil interface at its lens aperture. Photopatterned thermo-responsive hydrogel actuators are used to regulate the curvature of the water-oil interface, thus tuning the focal length, ranging from millimeters to infinity.


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