Jump to main content
Jump to site search

Issue 19, 2019
Previous Article Next Article

Near-atomically flat, chemically homogeneous, electrically conductive optical metasurface

Author affiliations

Abstract

Metasurfaces, or two-dimensional arrays of subwavelength-scale structures, can exhibit extraordinary optical properties. However, typical metasurfaces have a bumpy surface morphology that may restrict their practical applications. Here, we propose and demonstrate an optical metasurface that is composed of a thin metallic film, with hidden dielectric structures underneath, and a metal back mirror layer. Exploiting the large difference between the Thomas–Fermi screening length for longitudinal electric fields and the skin depth for transverse electromagnetic fields, the near-atomically flat top surface of the proposed structure can appear homogeneous chemically and electrically but highly inhomogenous optically. The size and shape of the hidden dielectric structures as well as the thickness of the top metallic layer can be tailored to acquire desired optical properties. We performed both theoretical and experimental studies of the proposed metasurface, finding a good agreement between them. This work provides a new platform for ultra-flat optical devices, such as a wavelength selective electrode, diffusive back reflector, meta-lens, and plasmonically enhanced optical biosensors.

Graphical abstract: Near-atomically flat, chemically homogeneous, electrically conductive optical metasurface

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Dec 2018, accepted on 28 Apr 2019 and first published on 29 Apr 2019


Article type: Paper
DOI: 10.1039/C8NR10436K
Nanoscale, 2019,11, 9580-9586

  •   Request permissions

    Near-atomically flat, chemically homogeneous, electrically conductive optical metasurface

    J. U. Kim, S. Jeon, M. Heo, H. Kim, R. Kim, N. Kim, Y. Lee and J. Shin, Nanoscale, 2019, 11, 9580
    DOI: 10.1039/C8NR10436K

Search articles by author

Spotlight

Advertisements