Stretchable Binary Fresnel Lens for Focus Tuning

Journal article (2016)

Authors

X. Li Electronic Components, Technology and Materials - EEMCS
L. Wei ImPhys/Optics - AS
René H. Poelma Electronic Components, Technology and Materials - EEMCS
S. Vollebregt Electronic Components, Technology and Materials - EEMCS
J. Wei EKL Processing - EEMCS
Paul Urbach ImPhys/Optics - AS
Pasqualina M Sarro Electronic Components, Technology and Materials - EEMCS
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
Copyright: © 2016 X. Li, L. Wei, René H. Poelma, S. Vollebregt, J. Wei, Paul Urbach, Pasqualina M Sarro, Kouchi Zhang
DOI: https://doi.org/10.1038/srep25348
More Info
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Published Date

03-05-2016

Language

English

Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

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%.