Imaging of Nanoscale Light Confinement in Plasmonic Nanoantennas by Brownian Optical Microscopy

Yeon Ui Lee, G. Bimananda M. Wisna, Su Wen Hsu, Junxiang Zhao, Ming Lei, Shilong Li, Andrea R. Tao, Andrea R. Tao, Zhaowei Liu, Zhaowei Liu

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


The strongly enhanced and confined subwavelength optical fields near plasmonic nanoantennas have been extensively studied not only for the fundamental understanding of light-matter interactions at the nanoscale but also for their emerging practical application in enhanced second harmonic generation, improved inelastic electron tunneling, harvesting solar energy, and photocatalysis. However, owing to the deep subwavelength nature of plasmonic field confinement, conventional optical imaging techniques are incapable of characterizing the optical performance of these plasmonic nanoantennas. Here, we demonstrate super-resolution imaging of ∼20 nm optical field confinement by monitoring randomly moving dye molecules near plasmonic nanoantennas. This Brownian optical microscopy is especially suitable for plasmonic field characterization because of its capabilities for polarization sensitive wide-field super-resolution imaging.

Original languageEnglish
Pages (from-to)7666-7672
Number of pages7
JournalACS nano
Issue number6
Publication statusPublished - 2020 Jun 23

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)


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