Charge transfer plasmon (CTP) modes arise when metallic nanoparticle dimers are connected by a conductive junction. This offers a unique opportunity to explore electron transport at optical frequencies as well as to attain narrow plasmon resonances that can be broadly modulated from visible to IR regimes, implying their potentials for applications in single-molecule electronics and sensing. This article showcases recent developments in theory and applications of charge transfer plasmon resonances (CTPRs) in various configurations of conductively linked plasmonic nanodimers. In particular, we give a due attention to exploiting ultratunable spectral features of charge transfer plasmon resonances for developing multifunctional plasmonic sensors for bulk, surface, gas and molecular sensing applications. We also discuss the implications of the charge and energy transfer between two plasmonic nanoparticles linked by sub-nanometer thick self-assembled monolayers for single-molecule conductance sensing and molecular electronics. In addition to the well-established plasmonic sensing schemes based on propagating and localized surface plasmon resonances, charge transfer plasmon resonance sensors may open up a new route in efforts to develop multifunctional sensing technologies.

中文翻译：

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多功能电荷转移等离子体共振传感器

当金属纳米粒子二聚体通过导电结连接时，会出现电荷转移等离子体 (CTP) 模式。这提供了一个独特的机会来探索光学频率下的电子传输以及获得可以从可见光到红外区域广泛调制的窄等离子体共振，这意味着它们在单分子电子学和传感中的应用潜力。本文展示了电荷转移等离子体共振 (CTPR) 在各种导电连接的等离子体纳米二聚体配置中的理论和应用的最新进展。特别是，我们适当注意利用电荷转移等离子体共振的超可调光谱特征来开发用于体积、表面、气体和分子传感应用的多功能等离子体传感器。我们还讨论了由亚纳米厚的自组装单层连接的两个等离子体纳米粒子之间的电荷和能量转移对单分子电导传感和分子电子学的影响。除了基于传播和局部表面等离子体共振的成熟等离子体传感方案外，电荷转移等离子体共振传感器可能为开发多功能传感技术开辟一条新途径。