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This paper presents a tunable micro Fresnel lens made by a polydimethylsiloxane/carbon nanotubes (PDMS/CNTs) configuration that can change its focal length by simply stretching the substrate. We believe this is the first time that this configuration has been realized and demonstrated. The Fresnel lens is formed by embedding vertically aligned CNTs bundles in a 2mm thick PDMS layer. It utilizes the...
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