Fabrication and optical properties of large-scale arrays of gold nanocavities based on rod-in-a-tube coaxials

Abstract

Centimeter sized arrays of gold coaxial rod-in-a tube cavities have been fabricated using anodized aluminum oxide as a template. The etching process used to create the cavities enables the production of extremely small gaps between tube and rod, on the order of 5 nm, smaller than those created by standard fabrication techniques. Normal incidence spectroscopy reveals two extinction peaks in the visible and near infrared wavelength range associated with resonant plasmonic modes excited in the structure. Numerical simulations show that the modes are associated with in-phase and out-of-phase hybridization of transverse dipolar excitations in the nanorod and in the tube.

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

“…Modern nanofabrication methodologies enable the creation of a number of different nanostructures with precisely controlled shapes, sizes, and spacing [3][4][5][6][7][8][9][10]. This has extended to the creation of a range of different metallic nanostructures array designs that produce localized surface plasmon resonances (LSPRs) [8][9][10][11][12][13][14][15]. One such design is based on arrays of quasi self-standing metal nanorods [13][14][15].…”

Application of AAO Matrix in Aligned Gold Nanorod Array Substrates for Surface-Enhanced Fluorescence and Raman Scattering

“…Metallic nanostructures that possess anisotropic symmetry, such as nanorods, are reported to produce LSPRs with high quality factors. [16][17][18][19] Nanorod array design enables choice over precise particle shape, length, width and inter-particle coupling. Such nanorod arrays have been reported to support negative refraction at visible to near-infrared wavelengths or provide near-field focusing for sub-wavelength imaging.…”

Arrays of plasmonic nanocavities for non-linear light interactions

“…1. [3]. To summarize, a planar aluminum film is deposited onto a glass substrate by magnetron sputtering, the thickness of which determines the maximum possible height of the nanostructures (aluminum thickness was 300nm here).…”