Design of functionalized tips driven by molecule-plasmon coupling.

ABSTRACT: The sensitivity of plasmon-enhanced spectroscopy (PES) fundamentally arises from the near-field enhancements within plasmonic nanocavities. To further advance PES, we utilized a molecule with exciton modes that are sensitive to the excitation wavelength to functionalize the metal tip. Our findings reveal that exciton modes play a dominant role in shaping near-field patterns. Specifically, "hot spots" within the exciton mode contribute positively to the near-field enhancements, while "dark spots" provide negative contributions. The functionalized tip exhibits pronounced field gradient effects compared to the bare tip, significantly improving sensitivity and selectivity in near-field spectroscopy. Moreover, both the field enhancement and field gradient effects of the functionalized tip can b

SUBMITTER: He H 

PROVIDER: S-EPMC12340610 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature