Engineering Giant Rabi Splitting via Strong Coupling between Localized and Propagating Plasmon Modes on Metal Surface Lattices: Observation of âšN Scaling Rule

Chun Yuan Wang, Yungang Sang, Xinyue Yang, Soniya S. Raja, Chang Wei Cheng, Haozhi Li, Yufeng Ding, Shuoyan Sun, Hyeyoung Ahn, Chih Kang Shih*, Shangjr Gwo, Jinwei Shi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

We present a strong coupling system realized by coupling the localized surface plasmon mode in individual silver nanogrooves and propagating surface plasmon modes launched by periodic nanogroove arrays with varied periodicities on a continuous silver medium. When the propagating modes are in resonance with the localized mode, we observe a âšN scaling of Rabi splitting energy, where N is the number of propagating modes coupled to the localized mode. Here, we confirm a giant Rabi splitting on the order of 450-660 meV (N = 2) in the visible spectral range, and the corresponding coupling strength is 160-235 meV. In some of the strong coupling cases studied by us, the coupling strength is about 10% of the mode energy, reaching the ultrastrong coupling regime.

Original languageEnglish
Pages (from-to)605-611
Number of pages7
JournalNano letters
Volume21
Issue number1
DOIs
StatePublished - 13 Jan 2021

Keywords

  • localized surface plasmon resonance
  • silver surface plasmon lattice
  • strong coupling
  • surface plasmon polariton

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