Ag-nanowire metamaterials: spectral reflectance analysis and homogenization models

Analysis of a fibre optic sensor design based on SPR in nanowire metamaterial films

“…We assume typical values for the structural parameters of the metallic nanowires produced by the techniques described in a previous work. 8 In particular, we assume a filling-ratio of f = 0.20, corresponding to nanowires of radius D = 47 nm and interwire spacing of a = 100 nm. The plots in Fig.…”

“…This membrane can be prepared using a standard bottomup fabrication technique where silver (Ag) is chemically electrodeposited inside a nanoporous anodic aluminum oxide (AAO) template. 8,9 The nanowires may be partially exposed using a selective chemical etching to remove part of the Al 2 O 3 matrix. The resulting membrane can be described as being composed of three overlaying effective media: one layer where the pores of the alumina matrix have not been completely filled with silver and are empty (i.e.…”

“…Recently, we have proposed a new type of metamaterial optical membrane constituted by metallic nanowires anchored in an aluminum oxide (Al 2 O 3 ) matrix which, exposed to an external liquid or gaseous medium, presents an even more exciting possibility for optical sensing. [6][7][8] The optical response of these materials strongly depends on the optical properties of the external medium filling the space between the nanowires. As a consequence, these metamaterials constitute functional, or smart, optical membranes ("smart metamembranes") with varying or controllable optical properties.…”

Tunable Plasmonic Resonance Sensor Using a Metamaterial Film in a D-Shaped Photonic Crystal Fiber for Refractive Index Measurements

“…In general, MGT does not properly retrieve the effective constitutive parameters of media with an arrayed set of large inclusions due to disregarding multipole interactions between local fields [15][16][17]. In uniaxial media, however, this analytical model remains valid to describe lightwave couplings that are direct contributions from local modes excited along the optical axis [18][19][20]. Since the surface plasmon modes at the flat interface between the D-shaped PCF and a conductive layer are excited by the fiber mode polarized perpendicularly to the interface [4,11], the plasmonic resonances derive from the local plasmon modes excited along the optical axis of the nanowire medium in the case of the geometric configuration displayed in Figure 1, preserving the accuracy of the Maxwell-Garnett formalism for the homogenization of the metamaterial.…”

Sensing with metallic nanowires

“…We assumed values for the diameter and the distance between the nanowires of about 16 nm and 100 nm, respectively, which correspond to typical values that can be obtained through bottom-up fabrication techniques, such as those described in reference 6 , which allow to synthetize metallic nanowires embedded in a One of the po of dielectr system, name the effective r metallic wire inter-wire dis refractive ind responses of the nanowire amplitude dis a distance of represents the wavelengths Fig. 2 …”