Phase imaging of transition from classical to quantum plasmonic couplings between a metal nanoparticle and a metal surface

Hui Wang, Hui Yu, Yan Wang, Xiaonan Shan, Hong Yuan Chen, Nongjian Tao

Research output: Contribution to journalArticlepeer-review

Abstract

When a metal nanoparticle is brought near to a metal surface within electron tunneling distance (∼1 nm), classical electromagnetic coupling between the nanoparticle and the metal is expected to transition to quantum coupling. We show that this transition can be observed as a drastic phase change in the surface plasmon resonance (SPR) images of the gold nanoparticles. We study the transition by controlling the distance between the nanoparticles and electrode surface, modeling the impact of the transition on the SPR image in terms of a phase shift and demonstrating detection of microRNA based on the transition from classical to quantum coupling. The work shows that the quantum coupling can be directly visualized in SPR, and the extremely sensitive dependence of the transition on distance leads to a biosensing principle with SPR.

Original languageEnglish (US)
Pages (from-to)17564-17570
Number of pages7
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number30
DOIs
StatePublished - Jul 28 2020

Keywords

  • Biosensing
  • Classical coupling
  • Phase transition
  • Quantum plasmonic coupling

ASJC Scopus subject areas

  • General

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