Transverse and longitudinal surface plasmon resonances of a hexagonal array of gold nanorods embedded in an alumina matrix

Abstract

The specular reflectance from a hexagonal array of gold nanorods embedded in an alumina matrix supported on an aluminum substrate is reported. The rods were grown by electrodeposition of gold in an alumina template and were oriented with their long axis perpendicular to the film surface. Optical reflectance measurements performed with an incident light beam of S polarization only exhibited the transverse surface plasmon resonance whereas the measurements obtained with P polarization exhibited both transverse and longitudinal resonances. A model for the reflectance from a thin anisotropic film was developed and shown to be in agreement with the experimental data

Negative index metamaterials based on metal-dielectric nanocomposites for imaging applications

“…The nanowires are synthesized inside the templates by means of ac electrodeposition ͑20 V, 250 Hz͒. 6,16 In the case of Au, an aqueous solution consisting of HAuCl 4 ͑1 g/ l͒ and boric acid ͑4 g/ l͒ was used as electrolyte. For Ag nanowires, an aqueous solution containing AgNO 3 ͑1 g/ l͒ was used as electrolyte.…”

Reflectance and SERS from an ordered array of gold nanorods

“…The ordinary and extraordinary dielectric constants describing this medium were calculated using the Maxwell-Garnett effective medium approximation. The model has been described in our earlier work [21,22] and incorporates some early and fundamental work in this field [23][24][25].…”

Reflectance and electrolyte electroreflectance from gold nanorod arrays embedded in a porous alumina matrix

“…From these data, it is clear that the Au nanorod/alumina composites are optically anisotropic and a model describing the reflectance from such a system would have to account for this fact. The earlier reflectance model proposed by Goad et al failed in this respect and a model was hence developed to fully explain all the features in the reflectance data [17]. Fig.…”