Substrates Matter: Influence of an Adjacent Dielectric on an Individual Plasmonic Nanoparticle

Knight, Mark W.; Wu, Yanpeng; Lassiter, J. Britt; Nordlander, Peter; Halas, Naomi J.

doi:10.1021/nl900945q

Cited by 427 publications

(547 citation statements)

References 34 publications

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“…Previous studies of gold particles on dielectric surfaces have correlated the magnitude of the red shift of the resonance with the permittivity of the surface by invoking the image dipole approximation. 39 Thus the longer wavelength of the resonance of particles on silicon (dielectric constant, ϳ 16.3 at resonance, 561 nm) relative to that of particles on quartz ( ϳ 2.13) is as expected. However, the further redness of the primary scattering resonance of particles on a gold film relative to particles on silicon indicates that the radiative mode of a nanoparticle antenna is more strongly coupled to the gold film ( 668 nm ϳ Ϫ14.1 ϩ 1.02i) than to silicon.…”

Section: Resultssupporting

confidence: 59%

Gold Nanoparticles on Polarizable Surfaces as Raman Scattering Antennas

et al. 2010

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Surface plasmons supported by metal nanoparticles are perturbed by coupling to a surface that is polarizable. Coupling results in enhancement of near fields and may increase the scattering efficiency of radiative modes. In this study, we investigate the Rayleigh and Raman scattering properties of gold nanoparticles functionalized with cyanine deposited on silicon and quartz wafers and on gold thin films. Dark-field scattering images display red shifting of the gold nanoparticle plasmon resonance and doughnut-shaped scattering patterns when particles are deposited on silicon or on a gold film. The imaged radiation patterns and individual particle spectra reveal that the polarizable substrates control both the orientation and brightness of the radiative modes. Comparison with simulation indicates that, in a particle−surface system with a fixed junction width, plasmon band shifts are controlled quantitatively by the permittivity of the wafer or the film. Surface-enhanced resonance Raman scattering (SERRS) spectra and images are collected from cyanine on particles on gold films. SERRS images of the particles on gold films are doughnut-shaped as are their Rayleigh images, indicating that the SERRS is controlled by the polarization of plasmons in the antenna nanostructures. Near-field enhancement and radiative efficiency of the antenna are sufficient to enable Raman scattering cyanines to function as gap field probes. Through collective interpretation of individual particle Rayleigh spectra and spectral simulations, the geometric basis for small observed variations in the wavelength and intensity of plasmon resonant scattering from individual antenna on the three surfaces is explained.

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Section: Resultssupporting

confidence: 59%

Gold Nanoparticles on Polarizable Surfaces as Raman Scattering Antennas

et al. 2010

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“…1.2 particles 23 . The particle surface density for the gold nanoparticles in the array was determined to be 1 np per 220 ± 60 nm 2 , therefore the majority of particles are unlikely to show inter-particle interactions 24 , there will however be some particles that are in closer proximity that may then interact.…”

Section: Sensiq Propagating Plasmon Surfacementioning

confidence: 99%

Measurement of the localised plasmon penetration depth for gold nanoparticles using a non-invasive bio-stacking method

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Olkhov

Shaw

2013

Phys. Chem. Chem. Phys.

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An alternating bio-stack of antibodies is polymerized on a gold surface to characterize the extent of the plasmon field. The decay in the kinetic binding parameters is attributed to the change in the penetration depth and calibrated using the continuous gold surface to derive a stack thickness of 17.5 ± 0.8 nm. The penetration depth of spherical-shaped nanoparticles with diameter 90 ± 13 nm diameter was determined to be 93 ± 10 nm.

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“…size of the nanorods and distance to the quantum emitter, is well above the single nanometer regime, the hybrid system can be described by fully classical scattering simulations. Consequently we can employ the time averaged Poynting vector to formulate the conservation of energy and model the energy flux [43,44]. The scattered and absorbed powers are obtained through Poynting's theorem:…”

Section: Appendix A: Simulation Of Spectramentioning

confidence: 99%

Entangled light from bimodal optical nanoantennas

et al. 2017

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We suggest a hybrid plasmonic device made of a bimodal metallic nanoantenna coupled to an incoherently pumped quantum emitter. This device emits light into the two modes entangled in the number of photons. The process is a prime example for losses turning from a nuisance into something beneficial, since, even though counterintuitively, the entanglement is enabled by strong incoherent processes, i.e. dominant scattering and absorption rates of the nanoantenna. This renders the nanoantenna an active source of nonclassicality. Both, the high emission rate and the degree of entanglement of the emitted light are insensitive with respect to imperfections in the nanoantenna length, rendering the scheme feasible for an implementation.

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Substrates Matter: Influence of an Adjacent Dielectric on an Individual Plasmonic Nanoparticle

Cited by 427 publications

References 34 publications

Gold Nanoparticles on Polarizable Surfaces as Raman Scattering Antennas

Gold Nanoparticles on Polarizable Surfaces as Raman Scattering Antennas

Measurement of the localised plasmon penetration depth for gold nanoparticles using a non-invasive bio-stacking method

Entangled light from bimodal optical nanoantennas

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