Plasmonic coupling in nondipolar gold colloidal dimers

Nanoscale Gold colloidal dimers are built thanks to the convective capillary force assembly (CFA) technique. CFA efficiently demonstrates precise dimer localization, particle separation control, and object reproducibility. Darkfield microspectroscopy measurements combined with numerical modeling exhibit a redshift in the dimer surface plasmon resonance as the interdistance decreases. The study points out that metallic particles, which are not in the dipolar approximation (diameter ∼150 nm), present a similar optical behavior than that of smaller particles for the first resonance mode. Finally, local electric field simulations indicate that these dimers are valid candidates for sensing applications in the near-infrared regime.

[1]  Christine H. Moran,et al.  Understanding the SERS Effects of Single Silver Nanoparticles and Their Dimers, One at a Time. , 2010, The journal of physical chemistry letters.

[2]  T. P. Rivera,et al.  Spectroscopic studies of plasmonic interactions in colloidal dimers fabricated by convective-capillary force assembly , 2009 .

[3]  T. P. Rivera,et al.  Assisted convective-capillary force assembly of gold colloids in a microfluidic cell: Plasmonic properties of deterministic nanostructures , 2008 .

[4]  Y. Wang,et al.  Synthesis of a gold nanoparticle dimer plasmonic resonator through two-phase-mediated functionalization , 2008, Nanotechnology.

[5]  Erik Dujardin,et al.  Shaping and manipulation of light fields with bottom-up plasmonic structures , 2008 .

[6]  Hyunhyub Ko,et al.  Nanostructured surfaces and assemblies as SERS media. , 2008, Small.

[7]  L. Rogobete,et al.  Coupling of plasmonic nanoparticles to their environments in the context of van der Waals-Casimir interactions , 2007, 0711.3655.

[8]  Jonathan Grandidier,et al.  Surface-plasmon hopping along coupled coplanar cavities , 2007 .

[9]  Prashant K. Jain,et al.  On the Universal Scaling Behavior of the Distance Decay of Plasmon Coupling in Metal Nanoparticle Pairs: A Plasmon Ruler Equation , 2007 .

[10]  Vahid Sandoghdar,et al.  Design of plasmonic nanoantennae for enhancing spontaneous emission. , 2007, Optics letters.

[11]  C. Noguez.  Surface Plasmons on Metal Nanoparticles: The Influence of Shape and Physical Environment , 2007 .

[12]  M. Gordon,et al.  Separation of colloidal nanoparticles using capillary immersion forces , 2006 .

[13]  Thomas R Huser,et al.  Surface-enhanced Raman scattering from individual au nanoparticles and nanoparticle dimer substrates. , 2005, Nano letters.

[14]  Adam Wax,et al.  Substrate effect on refractive index dependence of plasmon resonance for individual silver nanoparticles observed using darkfield microspectroscopy. , 2005, Optics express.

[15]  Arto V. Nurmikko,et al.  Strongly Interacting Plasmon Nanoparticle Pairs: From Dipole−Dipole Interaction to Conductively Coupled Regime , 2004 .

[16]  G. Schatz,et al.  Electromagnetic fields around silver nanoparticles and dimers. , 2004, The Journal of chemical physics.

[17]  Hongxing Xu.  A new method by extending Mie theory to calculate local field in outside/inside of aggregates of arbitrary spheres , 2003 .

[18]  Bernhard Lamprecht,et al.  Optical properties of two interacting gold nanoparticles , 2003 .

[19]  Xu,et al.  Electromagnetic contributions to single-molecule sensitivity in surface-enhanced raman scattering , 2000, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[20]  B. Draine,et al.  Discrete-Dipole Approximation For Scattering Calculations , 1994 .

[21]  H. V. Hulst.  Light Scattering by Small Particles , 1957 .