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Stretchable Binary Fresnel Lens for Focus Tuning

Journal Article (2016)
Author(s)

Xueming Li (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Lei Wei (TU Delft - ImPhys/Optics)

Rene Poelma (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Sten Vollebregt (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Jia Wei (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Paul Urbach (TU Delft - ImPhys/Optics)

Lina Sarro (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Guo Qi Zhang (TU Delft - Electrical Engineering, Mathematics and Computer Science)

Research Group
Electronic Components, Technology and Materials
DOI related publication
https://doi.org/10.1038/srep25348 Final published version
More Info
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Publication Year
2016
Language
English
Research Group
Electronic Components, Technology and Materials
Volume number
6
Article number
25348
Downloads counter
328
Collections
Institutional Repository
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Abstract

This paper presents a tuneable binary amplitude Fresnel lens produced by wafer-level microfabrication. The Fresnel lens is fabricated by encapsulating lithographically defined vertically aligned carbon nanotube (CNT) bundles inside a polydimethyl-siloxane (PDMS) layer. The composite lens material combines the excellent optical absorption properties of the CNT with the transparency and stretchability of the PDMS. By stretching the elastomeric composite in radial direction, the lens focal length is tuned. Good focusing response is demonstrated and a large focus change (≥24%) was achieved by stretching lenses up to 11.4%.