Tunable Metasurface and Flat Optical Zoom Lens on a Stretchable Substrate.
basic_science · Level V
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- Record sourced from PubMed, PMID 26986191.
- Also identified by DOI 10.1021/acs.nanolett.6b00618.
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Abstract
A mechanically reconfigurable metasurface that can continuously tune the wavefront is demonstrated in the visible frequency range by changing the lattice constant of a complex Au nanorod array fabricated on a stretchable polydimethylsiloxane substrate. It is shown that the anomalous refraction angle of visible light at 632.8 nm interacting with the tunable metasurface can be adjusted from 11.4° to 14.9° by stretching the substrate by ∼30%. An ultrathin flat 1.7× zoom lens whose focal length can continuously be changed from 150 to 250 μm is realized, which also demonstrates the potential of utilizing metasurfaces for reconfigurable flat optics.