4.6 Article

Plasmonic Polycrystals within Microbowl Arrays

Journal

ADVANCED OPTICAL MATERIALS
Volume 10, Issue 16, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202200467

Keywords

bowl template; dewetting; plasmonic polycrystals; surface-enhanced Raman scattering

Funding

  1. Zhejiang Provincial Natural Science Foundation of China [LR19E010001]
  2. National Key Research and Development Program of China [2018YFB0703803]
  3. National Science Foundation of China [51971200]
  4. Open Research Program of Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, Westlake University

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A new method for preparing plasmonic polycrystals, using a self-assembled bowl-in-bowl template-confined dewetting process, is developed. The size and composition of the plasmonic nanoparticles can be conveniently designed, and complex plasmonic coupling between the nanoparticles and plasmonic grains is observed. The presence of microbowls also leads to interesting optical properties in plasmonic nanostructures.
Plasmonic polycrystals composed of loosely packed plasmonic nanoparticles formed microscale plasmonic grains with random orientations may exhibit interesting optical properties. Their fabrication includes placing nanoparticles in order to form plasmonic grains and forming the random orientation of the plasmonic grains. The seemingly mutually exclusive nanoparticle ordering and random grain orientation processes challenge existing technologies. Here a self-assembled bowl-in-bowl template-confined dewetting process to prepare plasmonic polycrystals is developed. The size and composition of the plasmonic nanoparticles can be conveniently designed before experiments, which are inaccessible to conventional fabrication methods. Complex plasmonic coupling between the Au nanoparticles and the plasmonic grains within the plasmonic polycrystals is observed. The microbowls further endow plasmonic nanostructures with more interesting optical properties arising from multiple scattering processes within the concave bowl surfaces. The broadband response of the plasmonic polycrystals makes them active under 532, 633, and 785 nm laser excitation for surface-enhanced Raman scattering (SERS) sensing applications. Finite-difference time-domain simulations are performed to explain the optical properties of the plasmonic polycrystals and the SERS enhancement. The simple template-confined dewetting process provides a powerful approach to design plasmonic polycrystals with application potentials in plasmonic, sensing, and photonic fields.

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