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Abstract
We present a highly repeatable, lithography-free and mold-free method for fabricating flexible optical lenses by in situ curing liquid polydimethylsiloxane droplets on a preheated smooth surface with an inkjet printing process. This method enables us to fabricate lenses with a focal length as short as 5.6 mm, which can be controlled by varying the droplet volume and the temperature of the preheated surface. Furthermore, the lens can be attached to a smartphone camera without any accessories and can produce high-resolution (1 μm) images for microscopy applications.
Highlights
Traditional lenses are constructed by mechanical polishing or injection molding of rigid materials such as glass or plastics
We describe an inkjet printing technique to fabricate optical lenses by in situ curing PDMS droplets of controlled volume and at controlled temperature
This single-step method allows lenses with different focal lengths to be made by varying the droplet volume and surface temperature
Summary
Traditional lenses are constructed by mechanical polishing or injection molding of rigid materials such as glass or plastics. The high optical quality lens surface requires well-controlled fabrication parameters, which increase complexity and operating costs.[1] In contrast, lens formation due to surface energy minimization, such as liquid lenses, has provided an alternative method for creating small lenses of high quality without the requirement of molds or complex parameter control.[2] freely flowing liquid lenses require a system to provide mechanical stability and prevent evaporation.[3] In contrast, lenses can be fabricated by curing liquid polymers to set the lens profile permanently. We describe a method to fabricate lenses by inkjet printing of PDMS droplets on a heated surface. An imaging resolution of 1 μm with an optical magnification of 120× has been achieved
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