title: Surface plasmon coupling in end-to-end linked gold nanorod dimers and trimers.
abstract: Colloidal gold nanorods were aligned end-to-end via dithiol coupling. The scattering properties of the resultant nanostructures were investigated at the single particle level by combining dark-field microscopy and high resolution scanning electron microscopy. The longitudinal surface plasmon resonance of end-to-end coupled Au nanorods exhibited a red-shift as the number of rods in the chain increased. The nanostructures exhibited polarization-dependent optical properties, due to selective excitation of collective bonding and anti-bonding modes. The surface plasmon peak energy was not strongly dependent on the angle of rod-sphere-rod trimers. The experimental scattering spectra were compared with the results obtained from theoretical calculations using the Finite Element Method (FEM) and found to be in good agreement.
authors: CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum, Kerala, India.
authors: Jatish
authors: J
authors: Kumar
authors: Xingzhan
authors: X
authors: Wei
authors: Steven
authors: S
authors: Barrow
authors: Alison M
authors: AM
authors: Funston
authors: K George
authors: KG
authors: Thomas
authors: Paul
authors: P
authors: Mulvaney
mesh_terms: D019281:Dimerization; D020342:Finite Element Analysis; D006046:Gold / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D020349:Surface Plasmon Resonance
chemical_list: D011108:Polymers; D006046:Gold