Flexible Near-Field Nanopatterning with Ultrathin, Conformal Phase Masks on Nonplanar Substrates for Biomimetic Hierarchical Photonic Structures

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Young Woo Kwon
  • Junyong Park
  • Taehoon Kim
  • Seok Hee Kang
  • Hyowook Kim
  • Jonghwa Shin
  • Suck Won Hong

Detail(s)

Original languageEnglish
Pages (from-to)4609-4617
Journal / PublicationACS Nano
Volume10
Issue number4
Online published16 Mar 2016
Publication statusPublished - 26 Apr 2016
Externally publishedYes

Abstract

Multilevel hierarchical platforms that combine nano- and microstructures have been intensively explored to mimic superior properties found in nature. However, unless directly replicated from biological samples, desirable multiscale structures have been challenging to efficiently produce to date. Departing from conventional wafer-based technology, new and efficient techniques suitable for fabricating bioinspired structures are highly desired to produce three-dimensional architectures even on nonplanar substrates. Here, we report a facile approach to realize functional nanostructures on uneven microstructured platforms via scalable optical fabrication techniques. The ultrathin form (∼3 μm) of a phase grating composed of poly(vinyl alcohol) makes the material physically flexible and enables full-conformal contact with rough surfaces. The near-field optical effect can be identically generated on highly curved surfaces as a result of superior conformality. Densely packed nanodots with submicron periodicity are uniformly formed on microlens arrays with a radius of curvature that is as low as ∼28 μm. Increasing the size of the gratings causes the production area to be successfully expanded by up to 16 in2. The "nano-on-micro" structures mimicking real compound eyes are transferred to flexible and stretchable substrates by sequential imprinting, facilitating multifunctional optical films applicable to antireflective diffusers for large-area sheet-illumination displays.

Research Area(s)

  • antireflective diffusers, biomimetics, conformal phase masks, hierarchical structures, nanofabrication, near-field phase shift lithography

Citation Format(s)

Flexible Near-Field Nanopatterning with Ultrathin, Conformal Phase Masks on Nonplanar Substrates for Biomimetic Hierarchical Photonic Structures. / Kwon, Young Woo; Park, Junyong; Kim, Taehoon et al.

In: ACS Nano, Vol. 10, No. 4, 26.04.2016, p. 4609-4617.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review