Multifunctional charge transfer plasmon resonance sensors

Area of Science:

• Plasmonics and Nanophotonics
• Condensed Matter Physics
• Materials Science

Background:

• Charge transfer plasmon (CTP) modes emerge in metallic nanoparticle dimers linked by conductive junctions.
• CTPs enable exploration of electron transport at optical frequencies.
• CTPs exhibit narrow plasmon resonances tunable across visible to IR regimes.

Purpose of the Study:

• To review recent theoretical and applied developments in charge transfer plasmon resonances (CTPRs).
• To highlight the use of CTPRs in multifunctional plasmonic sensors for diverse sensing applications.
• To discuss CTPRs for single-molecule conductance sensing and molecular electronics.

Main Methods:

• Theoretical analysis of CTP modes in conductively linked plasmonic nanodimers.
• Exploitation of ultratunable spectral features of CTPRs.
• Investigation of charge and energy transfer in nanoparticle systems.

Main Results:

• CTPRs offer narrow, tunable resonances with potential in sensing and electronics.
• Multifunctional plasmonic sensors can be developed using CTPRs for various sensing modalities.
• Sub-nanometer linkages facilitate single-molecule conductance sensing.

Conclusions:

• CTPRs represent a promising platform for advanced sensing technologies.
• CTPRs offer a novel approach beyond traditional LSPR and SPR sensing.
• This field holds significant potential for single-molecule electronics and multifunctional sensing.