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Scalable and controlled self-assembly of aluminum-based random plasmonic metasurfaces

Siddique, Radwanul Hasan and Mertens, Jan and Hölscher, Hendrik and Vignolini, Silvia (2017) Scalable and controlled self-assembly of aluminum-based random plasmonic metasurfaces. Light: Science & Applications, 6 (7). Art. No. e17015. ISSN 2047-7538.

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Subwavelength metal-dielectric plasmonic metasurfaces enable light management beyond the diffraction limit. However, a cost-effective and reliable fabrication method for such structures remains a major challenge hindering their full exploitation. Here, we propose a simple yet powerful manufacturing route for plasmonic metasurfaces based on a bottom-up approach. The fabricated metasurfaces consist of a dense distribution of randomly oriented nanoscale scatterers composed of aluminum (Al) nanohole-disk pairs, which exhibit angle-independent scattering that is tunable across the entire visible spectrum. The macroscopic response of the metasurfaces is controlled via the properties of an isolated Al nanohole-disk pair at the nanoscale. In addition, the optical field confinement at the scatterers and their random distribution of sizes result in a strongly enhanced Raman signal that enables broadly tunable excitation using a single substrate. This unique combination of a reliable and lithography-free methodology with the use of aluminum permits the exploitation of the full potential of random plasmonic metasurfaces for diagnostics and coloration.

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Additional Information:© 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit Received 15 August 2016; Revised 31 January 2017; Accepted 15 February 2017; Accepted article preview online 17 February 2017. We thank M Heiler (KIT) for assistance with the metal evaporation and G Kamita (University of Cambridge) for assistance with the optical measurements. Furthermore, we acknowledge fruitful discussions with all members of the Biomimetics group at KIT and the Bio-inspired Photonics group at the University of Cambridge. RHS acknowledges funding from the Karlsruhe House of Young Scientists for a research stay at Cambridge. This work was partially supported by the Karlsruhe School of Optics and Photonics (KSOP, and the Karlsruhe Nano Micro Facility (KNMF,, a Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT, SV acknowledges a BBSRC David Phillips fellowship (BB/K014617/1) and ERC-2014-STG H2020 639088, and JM acknowledges support from the EPSRC (EP/G060649/1). Author contributions: RHS conducted the fabrication, optical analysis and FEM simulation. JM performed the SERS experiment, calculation and analysis. All authors contributed to writing the manuscript. Conflict of interest: The authors declare no conflict of interest.
Funding AgencyGrant Number
Karlsruhe House of Young ScientistsUNSPECIFIED
Karlsruhe School of Optics and PhotonicsUNSPECIFIED
Karlsruhe Nano Micro FacilityUNSPECIFIED
Karlsruhe Institute of TechnologyUNSPECIFIED
Biotechnology and Biological Sciences Research Council (BBSRC)BB/K014617/1
European Research Council (ERC)H2020 639088
Engineering and Physical Sciences Research Council (EPSRC)EP/G060649/1
Subject Keywords:aluminum plasmonics; plasmonic metasurfaces; polymer blends; self-assembly; SERS; structural color
Record Number:CaltechAUTHORS:20170714-082058402
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79104
Deposited By: Tony Diaz
Deposited On:14 Jul 2017 16:10
Last Modified:14 Jul 2017 16:10

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