Retardation-induced plasmon resonances in coupled nanoparticles

Kottmann, Jörg P.; Martin, Olivier J. F.

doi:10.1364/ol.26.001096

Cited by 175 publications

(132 citation statements)

References 16 publications

Supporting

Mentioning

117

Contrasting

Unclassified

Order By: Relevance

“…Additional modes at higher energies are also obvious in the spectra of the single particles in Figure 2a. A similar feature, attributed to hybridization of the individual plasmon modes at small interparticle separations has been predicted theoretically, 20,29,45 and was observed following laser-induced separation of previously touching spheres which resulted in . Surface charge density of interacting cylindrical, spherically capped gold nanorods placed 1.5 nm apart and with dimensions 78 nm × 24 nm, calculated using the electrostatic approximation 43,44 and where blue represents one charge (for example -ve) and the red the opposite charge (+ve) of the dipole.…”

supporting

confidence: 74%

Plasmon Coupling of Gold Nanorods at Short Distances and in Different Geometries

et al. 2009

View full text Add to dashboard Cite

The experimentally determined scattering spectra of discrete, crystalline, gold nanorod dimers arranged side-to-side, end-to-end, at right angles in different orientations and also with longitudinal offsets are reported along with the electron micrographs of the individual dimers. The spectra exhibit both red-and blue-shifted surface plasmon resonances, consistent with the plasmon hybridization model. However, the plasmon coupling constant for gold dimers with less than a few nanometers separation between the particles does not obey the exponential dependence predicted by the Universal Plasmon Ruler equation. The experimentally determined spectra are compared with electrodynamic calculations and the interactions between the individual rod plasmons in different dimer orientations are elucidated.

show abstract

supporting

confidence: 74%

Plasmon Coupling of Gold Nanorods at Short Distances and in Different Geometries

et al. 2009

View full text Add to dashboard Cite

show abstract

“…9,10 Exploring the properties and underlying physics of individual nanoparticles continues to be an area of keen activity, in part because the underlying physics has still to be fully explored and in part due to the many potential applications. The sensitivity of the LSPR to changes in particle shape and the manner in which adjacent particles interact are particularly important and have been the subject of many recent investigations, [11][12][13][14] nonetheless, it is the resonances of individual nanoparticles that usually dominate.…”

Section: Introductionmentioning

confidence: 99%

Transition from localized surface plasmon resonance to extended surface plasmon-polariton as metallic nanoparticles merge to form a periodic hole array

Aştilean²,

2004

View full text Add to dashboard Cite

We present results of experiments to determine the dispersion of the plasmon modes associated with periodic silver nanoparticle and nanohole arrays fabricated using an extension of the nanosphere lithography technique. Ordered monolayers of polystyrene nanospheres were used as a deposition mask through which silver was deposited by thermal evaporation, subsequent removal of the nanospheres thus leaving an array of metallic nanoparticles. By reactive-ion etching of the nanospheres in an oxygen plasma prior to silver deposition, arrays consisting of particles of increasing size were fabricated. The extremities of the particles eventually merge to create a continuous metallic network perforated by subwavelength holes, thus allowing a study of the particlehole transition. Combining optical measurements of transmittance and reflectance with information gained using scanning electron microscopy, three separate regimes were observed. For low etch times the samples comprise mainly individual nanoparticles and the optical response is dominated by localized surface plasmon resonances that show no dispersion. As the etch time is increased almost all of the nanoparticles merge with adjacent particles, although many defects are present-notably where some particles fail to merge, a small gap being left between them. The presence of these defects prevents an abrupt structural transition from metallic nanoparticles to a continuous metallic film perforated by an array of nanoholes. The presence of such gaps also results in dispersion data that lack clearly defined features. A further increase in etch time leads to samples with no gaps: instead, a continuous metal film perforated by a nanohole array is produced. The optical response of these structures is dominated by extended surface plasmon-polariton modes.

show abstract

“…With the rapid advances in the fabrication of very small particles [1,2,3] and nanowires [4,5,6], their optical properties are now used in a wide range of applications, including biosensors [7,8,9,10], near-field microscopy [11,12,13] and new optical devices [14,15,16,17]. Since the plasmons are associated with large electromagnetic fields near the particle surface, they play a key role in surface enhanced Raman scattering (SERS) [18].…”

Section: Introductionmentioning

confidence: 99%

Plasmon resonant coupling in metallic nanowires

Kottmann¹,

Martin²

2001

Opt. Express

Self Cite

304

237

View full text Add to dashboard Cite

Abstract:We investigate the plasmon resonances of interacting silver nanowires with a 50 nm diameter. Both non-touching and intersecting configurations are investigated. While individual cylinders exhibit a single plasmon resonance, we observe much more complex spectra of resonances for interacting structures. The number and magnitude of the different resonances depend on the illumination direction and on the distance between the particles. For very small separations, we observe a dramatic field enhancement between the particles, where the electric field amplitude reaches a hundredfold of the illumination. A similar enhancement is observed in the grooves created in slightly intersecting particles. The topology of these different resonances is related to the induced polarization charges. The implication of these results to surface enhanced Raman scattering (SERS) are discussed. Spectrosc. 31, 625-631 (2000). 11. T. J. Silva and S. Schultz, "A scanning near-field optical microscope for the imaging of magnetic domains in reflection," Rev. Sci. Inst. 67, 715-725 (1996). 2590-2593 (1999).

show abstract

Retardation-induced plasmon resonances in coupled nanoparticles

Cited by 175 publications

References 16 publications

Plasmon Coupling of Gold Nanorods at Short Distances and in Different Geometries

Plasmon Coupling of Gold Nanorods at Short Distances and in Different Geometries

Transition from localized surface plasmon resonance to extended surface plasmon-polariton as metallic nanoparticles merge to form a periodic hole array

Plasmon resonant coupling in metallic nanowires

Contact Info

Product

Resources

About