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Unveiling radial breathing mode in a particle-on-mirror plasmonic nanocavity. | LitMetric

Unveiling radial breathing mode in a particle-on-mirror plasmonic nanocavity.

Nanophotonics

Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, and Shaanxi Key Laboratory of Optical Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China.

Published: January 2022

AI Article Synopsis

  • Plasmonic radial breathing mode (RBM) is a phenomenon caused by surface plasmon waves in flat nanoparticles, characterized by low radiation and intense local electric fields.
  • Experimental evidence shows RBM can be observed in hexagonal gold nanoplate-on-mirror nanocavities using polarized light, revealing its origin from standing plasmon waves.
  • The RBM's sensitivity to nanoplate size and gap allows for tuning its wavelengths, offering potential applications in areas like enhanced sensing and nanolasers.

Article Abstract

Plasmonic radial breathing mode (RBM), featured with radially oscillating charge density, arises from the surface plasmon waves confined in the flat nanoparticles. The zero net dipole moment endows the RBM with an extremely low radiation yet a remarkable intense local field. On the other hand, owing to the dark mode nature, the RBMs routinely escape from the optical measurements, severely preventing their applications in optoelectronics and nanophotonics. Here, we experimentally demonstrate the existence of RBM in a hexagonal Au nanoplate-on-mirror nanocavity using a far-field linear-polarized light source. The polarization-resolved scattering measurements cooperated with the full-wave simulations elucidate that the RBM originates from the standing plasmon waves residing in the Au nanoplate. Further numerical analysis shows the RBM possesses the remarkable capability of local field enhancement over the other dark modes in the same nanocavity. Moreover, the RBM is sensitive to the gap and nanoplate size of the nanocavity, providing a straightforward way to tailor the wavelength of RBM from the visible to near-infrared region. Our approach provides a facile optical path to access to the plasmonic RBMs and may open up a new route to explore the intriguing applications of RBM, including surface-enhanced Raman scattering, enhanced nonlinear effects, nanolasers, biological and chemical sensing.

Download full-text PDF

Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11501202PMC
http://dx.doi.org/10.1515/nanoph-2021-0506DOI Listing

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