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Arrays of plasmonic nanoparticle dimers with defined nanogap spacers

2019

Article

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Plasmonic molecules are building blocks of metallic nanostructures that give rise to intriguing optical phenomena with similarities to those seen in molecular systems. The ability to design plasmonic hybrid structures and molecules with nanometric resolution would enable applications in optical metamaterials and sensing that presently cannot be demonstrated, because of a lack of suitable fabrication methods allowing the structural control of the plasmonic atoms on a large scale. Here we demonstrate a wafer-scale “lithography-free” parallel fabrication scheme to realize nanogap plasmonic meta-molecules with precise control over their size, shape, material, and orientation. We demonstrate how we can tune the corresponding coupled resonances through the entire visible spectrum. Our fabrication method, based on glancing angle physical vapor deposition with gradient shadowing, permits critical parameters to be varied across the wafer and thus is ideally suited to screen potential structures. We obtain billions of aligned dimer structures with controlled variation of the spectral properties across the wafer. We spectroscopically map the plasmonic resonances of gold dimer structures and show that they not only are in good agreement with numerically modeled spectra, but also remain functional, at least for a year, in ambient conditions.

Author(s): Jeong, Hyeon-Ho and Adams, Melanie C. and Guenther, Jan-Philipp and Alarcon-Correa, Mariana and Kim, Insook and Choi, Eunjin and Miksch, Cornelia and Mark, Alison F. Mark and Mark, Andrew G. and Fischer, Peer
Journal: ACS Nano
Year: 2019
Month: September
Day: 20

Department(s): Micro, Nano, and Molecular Systems
Bibtex Type: Article (article)

DOI: 10.1021/acsnano.9b04938
URL: https://doi.org/10.1021/acsnano.9b04938

BibTex

@article{Jeong2019,
  title = {Arrays of plasmonic nanoparticle dimers with defined nanogap spacers},
  author = {Jeong, Hyeon-Ho and Adams, Melanie C. and Guenther, Jan-Philipp and Alarcon-Correa, Mariana and Kim, Insook and Choi, Eunjin and Miksch, Cornelia and Mark, Alison F. Mark and Mark, Andrew G. and Fischer, Peer},
  journal = {ACS Nano},
  month = sep,
  year = {2019},
  url = {https://doi.org/10.1021/acsnano.9b04938},
  month_numeric = {9}
}