文章基本信息

标题：Phase imaging of transition from classical to quantum plasmonic couplings between a metal nanoparticle and a metal surface
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作者：Hui Wang ; Hui Yu ; Yan Wang 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2020
卷号：117
期号：30
页码：17564-17570
DOI：10.1073/pnas.2006443117
出版社：The National Academy of Sciences of the United States of America
摘要：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.
关键词：phase transition ; quantum plasmonic coupling ; classical coupling ; biosensing