Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 117, Issue 30, Pages 17564-17570Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2006443117
Keywords
phase transition; quantum plasmonic coupling; classical coupling; biosensing
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Funding
- National Natural Science Foundation of China [21773117, 21904062]
- Excellent Research Program of Nanjing University [ZYJH004]
- Fundamental Research Funds for the Central Universities [14380234]
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When a metal nanoparticle is brought near to a metal surface within electron tunneling distance (similar to 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.
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