期刊
LIGHT-SCIENCE & APPLICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/lsa.2017.15
关键词
aluminum plasmonics; plasmonic metasurfaces; polymer blends; self-assembly; SERS; structural color
类别
资金
- Karlsruhe House of Young Scientists
- Karlsruhe School of Optics and Photonics (KSOP)
- Karlsruhe Nano Micro Facility (KNMF)
- Helmholtz Research Infrastructure at Karlsruhe Institute of Technology (KIT)
- BBSRC David Phillips fellowship [BB/K014617/1]
- EPSRC [EP/G060649/1]
- [ERC-2014-STG H2020 639088]
- BBSRC [BB/K014617/1] Funding Source: UKRI
- EPSRC [EP/G060649/1] Funding Source: UKRI
Subwavelength metal-dielectric plasmonic metasurfaces enable light management beyond the diffraction limit. However, a costeffective 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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