Dielectric nanohole array metasurface for high-resolution near-field sensing and imaging.

ABSTRACT: Dielectric metasurfaces support resonances that are widely explored both for far-field wavefront shaping and for near-field sensing and imaging. Their design explores the interplay between localised and extended resonances, with a typical trade-off between Q-factor and light localisation; high Q-factors are desirable for refractive index sensing while localisation is desirable for imaging resolution. Here, we show that a dielectric metasurface consisting of a nanohole array in amorphous silicon provides a favourable trade-off between these requirements. We have designed and realised the metasurface to support two optical modes both with sharp Fano resonances that exhibit relatively high Q-factors and strong spatial confinement, thereby concurrently optimizing the device for both imaging an

SUBMITTER: Conteduca D 

PROVIDER: S-EPMC8172834 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature