Freestanding metasurfaces for optical frequencies

Abstract

We present freestanding metasurfaces operating at optical frequencies with a total thickness of only 40nm. The metasurfaces are fabricated by focused ion beam milling of nanovoids in a carbon film followed by thermal evaporation of gold and plasma ashing of the carbon film. As a first example, we demonstrate a metasurface lens based on resonant V-shaped nanovoids with a focal length of 1mm. The second example is a metasurface phase-plate consisting of appropriately oriented rectangular nanovoids that transforms a Gaussian input beam into a Laguerre-Gaussian $L{G}_{-1,0}$ mode.

References in corpus (4)

• Aberration-free ultra-thin flat lenses and axicons at telecom wavelengths based on plasmonic metasurfaces
• High-efficiency light-wave control with all-dielectric optical Huygens' metasurfaces
• Freestanding dielectric nanohole array metasurface for mid-infrared wavelength applications
• Coherent optical control of polarization with a critical metasurface

Cited by in corpus (1)

• Electron energy-loss spectroscopy on freestanding perforated gold films