Calibration of Dynamic Molecular Rulers Based on Plasmon Coupling between Gold Nanoparticles, Nano Letters. 5, 2246

Physics Department, Biophysics Graduate Program, and Chemistry Department, University of California, Berkeley, California 94720, USA.
Nano Letters (Impact Factor: 13.59). 12/2005; 5(11):2246-52. DOI: 10.1021/nl051592s
Source: PubMed


Pairs of noble metal nanoparticles can be used to measure distances via the distance dependence of their plasmon coupling. These "plasmon rulers" offer exceptional photostability and brightness; however, the advantages and limitations of this approach remain to be explored. Here we report detailed plasmon peak versus separation calibration curves for 42- and 87-nm-diameter particle pairs, determine their measurement errors, and describe experimental procedures to improve their performance in biology, nanotechnology, and materials sciences.

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    • "Especially surface plasmon (SP) mode of light at metal surfaces can assist interaction of light with subwavelength metallic structures beyond the diffraction limit [1]. Near-field resonances of SPs in metallic structures often demonstrate characteristic spectral responses [2]–[4] that can be used in designing filtering elements [5], [6] or labeled as footprints for sensing applications [7], [8]. "
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    ABSTRACT: Mesoscopic interaction of transverse electric (TE)-polarized light with metal gratings requires a dielectric coating on the metal surfaces to support a waveguide mode for optical resonances simulating those of surface plasmon resonances for transverse magnetic (TM)-polarized light. Here, we show a resonance-induced absorption of TE-polarized light at a dielectric-coated metal grating. The resonance is identified to have a Bloch wave nature, existing only for its even-order modes, restricted by the coupling phase matching conditions in a reflection configuration mode. It is also shown that the resonance properties are largely subjected to the size of the grating grooves, where localized cavity mode can be excited for large-size grooves, leading to broad absorption peaks due to nonresonant losses and bringing in new absorption peaks resulting from cavity resonances in the grooves.
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    • "The average diameters are about 22.6 nm for Au300 with the particle size distribution from 2.8 nm to 69.4 nm, and 26.1 nm for Au600 with the particle size distribution from 2.9 nm to 74.8 nm, respectively. The absorption peak of plasmon mode of gold NPs (Au20) on the ITO substrate (Fig. 2f) is similar to that of gold NPs in an aqueous environment (centered at about 525 nm) [41] [42], but with a redshift by about 14 nm due to the increase in refractive index of environment (from water to ITO-coated glass) and plasmon coupling between gold NPs [43]. The longer tails of the absorption peaks for Au100 and Au300 suggest a significant getting closer and aggregated gold NPs with each other [36]. "
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    ABSTRACT: tA simple method for creating three-dimensional porous wurtzite CdSe films incorporated with plasmonicgold by the electrochemical layer-by-layer assembly was proposed. A prominent enhancement in lightabsorption of CdSe films was attained by the efficient light scattering of gold plasmons as sub-wavelengthantennas and concentrators and the near-field coupling of gold plasmons with the neighboring porousCdSe films. The broadband photocurrent enhancement of Au–CdSe composite systems in the visible lightrange and the local current maximum between 600 and 700 nm suggested the cooperative action ofantenna effects and electromagnetic field enhancement resulting from localized surface plasmon exci-tation of gold. Furthermore, the photoelectrochemical response of porous Au–CdSe composite films washighly tunable with respect to the number of Au–CdSe bilayer. The optimal short-circuit current andopen-circuit potential were obtained in a four-layer Au–CdSe system because the thicker absorber layerwith less porous structure might limit the electrolyte diffusion into the hybrid electrode and impose abarrier for electron tunneling and transferring. The highly versatile and tunable properties of assembledporous Au–CdSe composite films demonstrated their potential application in energy conversion devices.© 2013 Elsevier Ltd. All rights
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    • "Moreover, the coupling between two nanoparticles in close proximity produces an alteration of the plasmon spectra. This alteration has been used as a nanometric ruler to determine the distance between them [19] [20]. In a previous work, [4] we theoretically showed that the coupling between two nanoparticles is highly sensitive to the polarization of the external field. "
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    ABSTRACT: Live cell imaging using metallic nanoparticles as tags is an emerging technique to visualize long and highly dynamic processes due to the lack of photobleaching and high photon rate. However, the lack of excited states as compared to fluorescent dyes prevents the use of resonance energy transfer and recently developed super resolution methods to measure distances between objects closer that the resolution limit. In this work, we experimentally demonstrate a technique to determine subdiffraction distances based on the near field coupling of metallic nanoparticles. Due to the symmetry breaking in the scattering cross section, not only distances but also relative orientations can be measured. Gold nanoparticles were prepared on glass in such way that a small fraction of dimers was present. The sample was sequentially illuminated with two wavelengths to separate background from nanoparticle scattering based on their spectral properties. A novel total internal reflection illumination scheme in which the polarization can be rotated was used to further minimize background contributions. In this way, radii, distance and orientation were measured for each individual dimer and their statistical distributions were found to be in agreement with the expected ones. We envision that this technique will allow fast and long term tracking of relative distance and orientation in biological processes.
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