Topic
Surface plasmon resonance
About: Surface plasmon resonance is a research topic. Over the lifetime, 24909 publications have been published within this topic receiving 810976 citations. The topic is also known as: Surface plasmon resonance & SPR (technology).
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01 Jan 2008
TL;DR: In this article, the authors introduce surface plasmon polariton waveguides and negative dielectric optical waveguiders for nano-optical guiding nanoparticle Plasmon Waveguides.
Abstract: Introduction to Surface Plasmon Polariton Waveguides Negative Dielectric Optical Waveguides for Nano-Optical Guiding Nanoparticle Plasmon Waveguides Surface Plasmon Polariton Gap Waveguide and Its Applications Metal Heterostructures Plasmonic Slot Waveguides Plasmonic Modulators Metal Trench Waveguides: Experiments and Analysis Fundamentals of Channel and Wedge Plasmon Polaritons Channel Plasmon Polaritons in Triangular Grooves Nanophotonic Components Utilizing Channel Plasmon Polaritons Adiabatic Concentration and Coherent Control in Nanoplasmonic Waveguides Nanoplasmonics: Components, Devices and Circuits
235 citations
TL;DR: In this article, an aqueous room temperature synthesis method for the production of gold nanoparticles that have a number of branches ultimately resembling the shape of sea urchins was reported.
Abstract: Here, we report on an aqueous room temperature synthesis method for the production of gold nanoparticles that have a number (>4) of branches ultimately resembling the shape of sea urchins. The particles are synthesized in the presence of water soluble thiol terminated molecules, used as ligand molecules. These nano-urchins are produced in high yield and exhibit unique optical properties. The thiolated ligands stabilize the particles, making it possible to dry them and store them for days. When redissolved, the particles show some aggregation but not a loss in shape; their extinction spectrum shows a shift in the plasmon resonance from 585 to 622 nm together with a peak broadening. Large local electromagnetic (EM) field enhancements are expected near the sharp featured branches of the nano-urchins. Finite difference time-domain (FDTD) calculations performed on a nanoparticle with four branches show enhancements of the light intensity relative to the incident field of approximately 3000-fold. We reason that...
234 citations
TL;DR: In this paper, the first experimental and theoretical investigation of the coupling of second-harmonic generation of light to surface plasmons in thin silver films was performed, and the results showed that a model based on polarization sources at the silver-air interface correctly predicts the observed harmonic enhancement of one and a half orders of magnitude because of excitation of the surface plasmon.
Abstract: We report the first experimental and theoretical investigation of the coupling of second-harmonic generation of light to surface plasmons in thin silver films. A model of second-harmonic generation due to polarization sources at the silver-air interface correctly predicts the observed harmonic enhancement of one and a half orders of magnitude because of excitation of the surface plasmon.
234 citations
TL;DR: It is suggested that, for certain film designs, interlayer interparticle resonance might be revealed as an independent contribution at 800 nm in UV-visible spectra of the SA-LbL films.
Abstract: Nanoscale uniform films containing gold nanoparticle and polyelectrolyte multilayer structures were fabricated by the using spin-assembly or spin-assisted layer-by-layer (SA-LbL) deposition technique. These SA-LbL films with a general formula [Au/(PAH-PSS)nPAH]m possessed a well-organized microstructure with uniform surface morphology and high surface quality at a large scale (tens of micrometers across). Plasmon resonance peaks from isolated nanoparticles and interparticle interactions were revealed in the UV-visible extinction spectra of the SA-LbL films. All films showed the strong extinction peak in the region of 510-550 nm, which is due to the plasmon resonance of the individual gold nanoparticles redshifted because of a local dielectric environment. For films with sufficient density of gold nanoparticles within the layers, the second strong peak was consistently observed between 620 and 660 nm, which is the collective plasmon resonance from intralayer interparticle coupling. Finally, we suggested that, for certain film designs, interlayer interparticle resonance might be revealed as an independent contribution at 800 nm in UV-visible spectra. The observation of independent and concurrent individual, intralayer, and interlayer plasmon resonances can be critical for sensing applications, which involve monitoring of optomechanical properties of ultrathin optically active compliant membranes.
234 citations
TL;DR: It is shown that atomically precise nanocrystal molecules are achievable and that the factor of atomic shell closing contributes to their extraordinary stability compared to other sizes, which opens up new opportunities for investigating many fundamental issues of nanocrystals.
Abstract: Since Faraday’s pioneering work on gold colloids, tremendous scientific research on plasmonic gold nanoparticles has been carried out, but no atomically precise Au nanocrystals have been achieved. This work reports the first example of gold nanocrystal molecules. Mass spectrometry analysis has determined its formula to be Au333(SR)79 (R = CH2CH2Ph). This magic sized nanocrystal molecule exhibits fcc-crystallinity and surface plasmon resonance at approximately 520 nm, hence, a metallic nanomolecule. Simulations have revealed that atomic shell closing largely contributes to the particular robustness of Au333(SR)79, albeit the number of free electrons (i.e., 333 - 79 = 254) is also consistent with electron shell closing based on calculations using a confined free electron model. Guided by the atomic shell closing growth mode, we have also found the next larger size of extraordinarily stability to be Au∼530(SR)∼100 after a size-focusing selection—which selects the robust size available in the starting polydisperse nanoparticles. This work clearly demonstrates that atomically precise nanocrystal molecules are achievable and that the factor of atomic shell closing contributes to their extraordinary stability compared to other sizes. Overall, this work opens up new opportunities for investigating many fundamental issues of nanocrystals, such as the formation of metallic state, and will have potential impact on condensed matter physics, nanochemistry, and catalysis as well.
233 citations