Tips versus Holes: ×10 Higher Scattering in FIB-made Plasmonic Nanoscale Arrays for Spectral Imaging.

ABSTRACT: Plasmonic nanostructure arrays, designed for performance as pixels in an advanced SERS imaging device, were fabricated by gallium focused ion beam (FIB). Though the FIB is best suited for etching holes and negative structures, our previously reported simulations favor protrusions. Herein, we report on the FIB methodology to "sculpt" positive structures by "ion-blasting" away the surrounding material. Nanoprotrusions and nanoholes with different aspect ratios are compared experimentally with depth and height controlled by the dwell time. The amplitude and spectra of optical absorption and scattering from the two species are compared as a function of structure height. Measurements were performed using ASI's model Rainbow hyperspectral camera, demonstrating the utility of hyperspectral micros

SUBMITTER: Mandelbaum Y 

PROVIDER: S-EPMC11603395 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature