Fig. 4: 2DGFs for low-loss nanoplasmonics.
From: Large area single crystal gold of single nanometer thickness for nanophotonics
a Schematic illustration of patterning of a 2DGF into a nanoribbon array supporting dipolar localized surface plasmon (LSP) modes. Parameters w, p, and t represent the width, period, and thickness of a nanoribbon, respectively. b, c Scanning electron microscopy (SEM) images of nanoribbon arrays fabricated from a 2DGF (b) and a sputtered gold film (c) with the same thickness of 3 nm. Insets, enlarged SEM images of the nanoribbons. d Transmittance of nanoribbon arrays fabricated with 2DGFs (dashed lines) and sputtered gold films (solid lines) for various nanoribbon thicknesses (w = 100 nm). e Measured (solid lines) and calculated (dashed lines) transmittance of nanoribbon arrays fabricated with 2DGFs for various nanoribbon widths (t = 2.5 nm). f Numerically calculated space-integrated near-field intensities confined within an area extending by a distance d outside the nanoribbons made from a 2.5-nm-thick 2DGF and a 30-nm-thick sputtered gold film. The insets show the corresponding near-field intensity distributions of the nanoribbons having the same resonance wavelength of 970 nm.
