Plasmonic Nanoparticle Arrays with Nanometer Separation for High-Performance SERS Substrates

Theiss, Jesse; Pavaskar, Prathamesh; Echternach, P. M.; Muller, Richard E.; Cronin, Stephen B.

doi:10.1021/nl904170g

Cited by 238 publications

(212 citation statements)

References 41 publications

Supporting

Mentioning

207

Contrasting

Order By: Relevance

“…Strong plasmonic enhancement of the local fields [1][2][3][4][5] opens a route to numerous practical applications such as surface enhanced Raman scattering (SERS) [6][7][8][9], and optical nano-antennas [10][11][12][13]. In nanoparticle assemblies, the hybridization of plasmonic modes can serve for guiding of the propagating fields [14,15], as well as offering a path for rational engineering of a desired optical response and local field profile [4].…”

Section: Introductionmentioning

confidence: 99%

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

et al. 2013

View full text Add to dashboard Cite

Abstract:Using a fully quantum mechanical approach we study the optical response of a strongly coupled metallic nanowire dimer for variable separation widths of the junction between the nanowires. The translational invariance of the system allows to apply the time-dependent density functional theory (TDDFT) for nanowires of diameters up to 10 nm which is the largest size considered so far in quantum modeling of plasmonic dimers. By performing a detailed analysis of the optical extinction, induced charge densities, and near fields, we reveal the major nonlocal quantum effects determining the plasmonic modes and field enhancement in the system. These effects consist mainly of electron tunneling between the nanowires at small junction widths and dynamical screening. The TDDFT results are compared with results from classical electromagnetic calculations based on the local Drude and non-local hydrodynamic descriptions of the nanowire permittivity, as well as with results from a recently developed quantum corrected model. The latter provides a way to include quantum mechanical effects such as electron tunneling in standard classical electromagnetic simulations. We show that the TDDFT results can be thus retrieved semi-quantitatively within a classical framework. We also discuss the shortcomings of classical non-local hydrodynamic approaches. Finally, the implications of the actual position of the screening charge density at the gap interfaces are discussed in connection with plasmon ruler applications at subnanometric distances. References and links 1. L. Kelly, E. Coronado, L. L. Zhao, and G. C. Schatz, "The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment," J. Phys. Chem. B 107, 668-667 (2003 B 48, 18178-18188 (1993). 68. P. Apell, and D. R. Penn, "Optical properties of small metal spheres: surface effects," Phys. Rev. Lett. 50, 1316Lett. 50, -1319Lett. 50, (1983. 69. J.-H. Klein-Wiele, P. Simon, and H.-G. Rubahn, "Size-Dependent Plasmon lifetimes and electron-phonon coupling time constants for surface bound Na clusters," Phys. Rev. Lett. 80, 45-48 (1998 B 52, 14219-14234 (1995). 81. L. Serra, and A. Rubio, "Core polarization in the optical response of metal clusters: generalized time-dependent density-functional theory," Phys. Rev. Lett. 78, 1428Lett. 78, -1431Lett. 78, (1997. 82. E. Prodan, P. Nordlander, and N. J. Halas, "Electronic structure and optical properties of Gold nanoshells," Nano Lett. 3, 1411Lett. 3, -1415Lett. 3, (2003. 83. E. Prodan, P. Nordlander, and N. J. Halas, "Effects of dielectric screening on the optical properties of metallic nanoshells," Chem. Phys. Lett. 368, 94-101 (2003). 84. K.-D. Tsuei, E. W. Plummer, A. Liebsch, K. Kempa, and P. Bakshi, "Multipole plasmon modes at a metal surface," Phys. Rev. Lett. 64, 44-47 (1990). 85. A. J. Bennett, "Influence of the electron charge distribution on surface-plasmon dispersion," Phys. 80, 5105-5108 (1998). 88. S. Berciaud, L. Cognet, P. Tamarat, and B. Lounis, "Observation of intrinsic si...

show abstract

Section: Introductionmentioning

confidence: 99%

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Another parameter dictating the intensity of Raman signal is the local field enhancement that arises from plasmonic resonances, tapers, gaps, and high curvature in the antenna design [46,47]. Impedance matching and reduction of mode volume of the antenna provide maximum local field enhancement [43].…”

Section: Simulation Resultsmentioning

confidence: 99%

Antenna Design for Directivity-Enhanced Raman Spectroscopy

Ahmed

Pang

Hajisalem

et al. 2012

International Journal of Optics

View full text Add to dashboard Cite

Antenna performance can be described by two fundamental parameters: directivity and radiation efficiency. Here, we demonstrate nanoantenna designs in terms of improved directivity. Performance of the antennas is demonstrated in Raman scattering experiments. The radiated beam is directed out of the plane by using a ground plane reflector for easy integration with commercial microscopes. Parasitic elements and parabolic and waveguide nanoantennas with a ground plane are explored. The nanoantennas were fabricated by a series of electron beam evaporation steps and focused ion beam milling. As we have shown previously, the circular waveguide nanoantenna boosts the measured Raman signal by 5.5x with respect to a dipole antenna over a ground plane; here, we present the design process that led to the development of that circular waveguide nanoantenna. This work also shows that the parabolic nanoantenna produces a further fourfold improvement in the measured Raman signal with respect to a circular waveguide nanoantenna. The present designs are nearly optimal in the sense that almost all the beam power is coupled into the numerical aperture of the microscope. These designs can find applications in microscopy, spectroscopy, light-emitting devices, photovoltaics, single-photon sources, and sensing.

show abstract

“…As a matter of fact, in a system consisting of isolated metal particles, dimers, and other higher-order clusters, isolated particles seem to contribute very little to the overall signals. [11][12][13][14][15] Through experiments and simulations, it is becoming clear what would constitute an effective "hot spot". The gap must be less than 10 nm wide and preferably formed by two elongated silver features.…”

Section: Introductionmentioning

confidence: 99%

Morphology Effects of Cap-shaped Silver Nanoparticle Films as a SERS Platform

Okamoto

2016

ANAL. SCI.

View full text Add to dashboard Cite

In this paper, we evaluate randomly adsorbed cap-shaped silver nanoparticles for applications to surface-enhanced Raman spectroscopy, SERS. They were prepared by depositing silver on top of surface-adsorbed monodisperse SiO2 nanospheres, in a manner similar to the method for preparing metal film on nanosphere, MFON, but one major difference lies in the fact that nanospheres are randomly adsorbed rather than as a close-packed MFON. With random MFON, it is possible to incorporate nanospheres with more than one size. Mixing has been found to increase SERS performance. More specifically, by using 50 and 100 nm nanospheres, we found that substrates containing both types outperform substrates prepared from 100% of either 50 or 100 nm nanospheres. As evaluated by spectrophotometry, this increase could not be attributed to an increase in the extinction coefficient of the substrate at the irradiation wavelength of SERS measurements.

show abstract

Plasmonic Nanoparticle Arrays with Nanometer Separation for High-Performance SERS Substrates

Cited by 238 publications

References 41 publications

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

Quantum effects and nonlocality in strongly coupled plasmonic nanowire dimers

Antenna Design for Directivity-Enhanced Raman Spectroscopy

Morphology Effects of Cap-shaped Silver Nanoparticle Films as a SERS Platform

Contact Info

Product

Resources

About