Cascaded nanooptics to probe microsecond atomic-scale phenomena.

ABSTRACT: Plasmonic nanostructures can focus light far below the diffraction limit, and the nearly thousandfold field enhancements obtained routinely enable few- and single-molecule detection. However, for processes happening on the molecular scale to be tracked with any relevant time resolution, the emission strengths need to be well beyond what current plasmonic devices provide. Here, we develop hybrid nanostructures incorporating both refractive and plasmonic optics, by creating SiO₂ nanospheres fused to plasmonic nanojunctions. Drastic improvements in Raman efficiencies are consistently achieved, with (single-wavelength) emissions reaching 10⁷ counts⋅mW^-1⋅s^-1 and 5 × 10⁵ counts∙mW^-1∙s^-1∙molecule^-1, for enhanc

SUBMITTER: Kamp M 

PROVIDER: S-EPMC7334475 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature