Direct observation of localized surface plasmon coupling

Krenn, Joachim R.; Weeber, Jean-Claude; Dereux, Alain; Bourillot, Eric; Goudonnet, J. P.; Schider, Gerburg; Leitner, A.; Aussenegg, F. R.; Girard, Christian

doi:10.1103/physrevb.60.5029

Cited by 105 publications

(69 citation statements)

References 16 publications

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“…It is for example responsible for non-radiative energy transfer between neighboring particles [24][25][26]. The near field also produces the SERS effect when molecules are adsorbed on the particle [1,2,27].…”

Section: R E S U L T S 31mentioning

confidence: 99%

Influence of the cross section and the permittivity on the plasmon-resonance spectrum of silver nanowires

Kottmann

Martin

2001

Applied Physics B: Lasers and Optics

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We investigate the plasmon resonances for silver nanowires with a non-regular cross section. To study the relationship between the cross section and the spectrum of the plasmon resonances, we consider cross sections evolving from a rectangular shape to a triangular one. In particular, we study the influence of the sharpness of a corner on the near-field enhancement at the vicinity of a particle and discuss its implications for surface-enhanced Raman scattering. We also investigate the influence of the absorption on the plasmon-resonance spectrum and on the near-field enhancement.

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Section: R E S U L T S 31mentioning

confidence: 99%

Influence of the cross section and the permittivity on the plasmon-resonance spectrum of silver nanowires

Kottmann

Martin

2001

Applied Physics B: Lasers and Optics

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“…Note that our approach provides information that is different from the light emission induced by electron beams which was reported already [20]. In such experiments photons are generated by electrons passing the optical antenna, such giving information on the 3D electrical field distribution around the antenna, similarly to SNOM-experiments [16,17,18,19]. The PEEM method therefore promises to shed more light on the optical near field right at the metal surface, which up to now has been very difficult to access quantitatively.…”

mentioning

confidence: 97%

“…Dielectric tips are less perturbing but have only limited resolution. They have been used to investigate the optical near fields of several plasmonic nanostructures [17]. The use of almost pointlike probes for the near field such as a single molecule [18] or the end of a carbon nanotube [19] circumvents the aforementioned problems but the experimental difficulties prevent these approaches from being applicable as a standard method for the investigation of a larger amount of samples.…”

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confidence: 99%

Photoemission Electron Microscopy as a Tool for the Investigation of Optical Near Fields

et al. 2005

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Photoemission electron microscopy was used to image the electrons photoemitted from specially tailored Ag nanoparticles deposited on a Si substrate (with its native oxide SiO x ). Photoemission was induced by illumination with a Hg UV-lamp (photon energy cutoffhω U V = 5.0 eV, wavelength λ U V = 250 nm) and with a Ti:Sapphire femtosecond laser (hω l = 3.1 eV, λ l = 400 nm, pulse width below 200 fs), respectively. While homogeneous photoelectron emission from the metal is observed upon illumination at energies above the silver plasmon frequency, at lower photon energies the emission is localized at tips of the structure. This is interpreted as a signature of the local electrical field therefore providing a tool to map the optical near field with the resolution of emission electron microscopy.

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“…4 -6 The enhanced local fields of plasmon resonant particles are useful for a variety of applications, including biosensors, [7][8][9] as sources for nanolithography 10 and as probes in scanning near-field optical microscopy ͑SNOM͒. 11,12 Finally, their spectral selectivity may make plasmon resonant particles a key component in future passive optical devices based on evanescent optical transport [13][14][15] or even in newly proposed active optical components. 16 In recent years, considerable progress has been made in the fabrication of metallic nanostructures in a controlled manner, including features in the 10-50 nm range.…”

Section: Introductionmentioning

confidence: 99%

Plasmon resonances of silver nanowires with a nonregular cross section

et al. 2001

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We investigate numerically the spectrum of plasmon resonances for metallic nanowires with a nonregular cross section, in the 20-50 nm range. We first consider the resonance spectra corresponding to nanowires whose cross sections form different simplexes. The number of resonances strongly increases when the section symmetry decreases: A cylindrical wire exhibits one resonance, whereas we observe more than five distinct resonances for a triangular particle. The spectral range covered by these different resonances becomes very large, giving to the particle-specific distinct colors. At the resonance, dramatic field enhancement is observed at the vicinity of nonregular particles, where the field amplitude can reach several hundred times that of the illumination field. This near-field enhancement corresponds to surface-enhanced Raman scattering ͑SERS͒ enhancement locally in excess of 10 12 . The distance dependence of this enhancement is investigated and we show that it depends on the plasmon resonance excited in the particle, i.e., on the illumination wavelength. The average Raman enhancement for molecules distributed on the entire particle surface is also computed and discussed in the context of experiments in which large numbers of molecules are used.

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Direct observation of localized surface plasmon coupling

Cited by 105 publications

References 16 publications

Influence of the cross section and the permittivity on the plasmon-resonance spectrum of silver nanowires

Influence of the cross section and the permittivity on the plasmon-resonance spectrum of silver nanowires

Photoemission Electron Microscopy as a Tool for the Investigation of Optical Near Fields

Plasmon resonances of silver nanowires with a nonregular cross section

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