Substrate effects on the optical properties of spheroidal nanoparticles

Román-Velázquez, C. E.; Noguez, Cecilia; Barrera, Rubén G.

doi:10.1103/physrevb.61.10427

Cited by 47 publications

(47 citation statements)

References 27 publications

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“…In general, the multipolar effects have been found to become more important as a/b tends to unity, i.e., when the actual shape approaches spherical. [149,150] Recent experimental observation in supported silver nanoparticles has been consistent with the theoretical predictions. [151][152][153][154] Effect of particle-particle interaction on optical properties of 1D chains There is an intense and growing interest in controlled patterning and alignment of nanostructures from the perspective of their synthesis and unique properties, especially with respect to their excellent optical response.…”

Section: Mechanistic View Of Spr In Metal Nanoparticlessupporting

confidence: 65%

“…The structure of these resonances is more evident when the contrast between the dielectric responses of the ambient and substrate increases. [149,150] When the particle is in close contact with a substrate, an infinite number of multipolar SPRs is possible and smooth spectra are expected. On the contrary, when the particle is located at a certain distance above the substrate, a welldefined structure of resonances is found.…”

Section: Mechanistic View Of Spr In Metal Nanoparticlesmentioning

confidence: 98%

“…As the particle approaches the substrate, the multipolar excitations are evident since the spectra become wider and several peaks appear. [149,150] In Fig. 6d, the extinction coefficient is shown for the transversal modes of a silver prolate at d∼0 from a TiO 2 substrate.…”

Section: Mechanistic View Of Spr In Metal Nanoparticlesmentioning

confidence: 98%

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Plasmonic Optical Properties and Applications of Metal Nanostructures

2008

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In this review article, we provide an overview of recent research activities in the study of plasmonic optical properties of metal nanostructures with emphasis on understanding the relation between surface plasmon absorption and structure. Both experimental results and theoretical calculations have indicated that the plasmonic absorption strongly depends on the detailed structure of the nanomaterials. Examples discussed include spherical nanoparticles, nanorods, nanowires, hollow nanospheres, aggregates, and nanocages. Plasmon-phonon coupling measured from dynamic studies as a function of particle size, shape, and aggregation state is also reviewed. The fascinating optical properties of metal nanostructures find important applications in a number of technological areas including surface plasmon resonance, surface-enhanced Raman scattering, and photothermal imaging and therapy. Their novel optical properties and emerging applications are illustrated using specific examples from recent literature. The case of hollow nanosphere structures is highlighted to illustrate their unique features and advantages for some of these applications.

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Section: Mechanistic View Of Spr In Metal Nanoparticlessupporting

confidence: 65%

Section: Mechanistic View Of Spr In Metal Nanoparticlesmentioning

confidence: 98%

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Plasmonic Optical Properties and Applications of Metal Nanostructures

2008

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“…The inclusion of multipolar interactions between the particle pair and its image gives rise to resonances additional to the dipolar one. The structure of these resonances is more evident when the contrast between the dielectric responses of the ambient and substrate increases [11,18]. For example, when a particle is in close contact with (or embedded in) the substrate, smooth spectra are obtained.…”

Section: Designs Results and Discussionmentioning

confidence: 94%

Plasmonics Effects of Nanometal Embedded in a Dielectric Substrate

Chau¹,

Jiang²

2011

Plasmonics

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We numerically report on first realization of nearfield interaction and localized surface Plasmon resonance of a pair of silver-shell nanospheres with different dielectric holes embedded in a dielectric substrate using finite element method. An electromagnetic mode different from the solid case of the same volume is excited inside and outside the shell surface, resulting in an intensity enhancement in a gap of particle pair surrounding the particlesubstrate interface. We find that the embedded depth of the nanoparticles pair in a substrate will influence the position of the localized fields which is confined in the gap. Besides, the near-field intensity becomes less intense and the spectrum of peak resonances red-shifted as the index difference of interface and embedded depth decreases. The proposed models have been prepared to cover the ultraviolet-visible, visible, and near-infrared (NIR) regions with application to sensors and spectroscopy purposes by varying the embedded depth and pertinent to the functionality of sensors, spectroscopy, and other optical devices.

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“…This approach may be useful to determine or estimate the orientation of biomolecules relative to the surface of SPPRsensors for a more comprehensive understanding and quantitative estimation of biomolecular layers. One should note that interaction between the molecule and the surface can lead to local field enhancement effect which causes strong enhancement of molecular polarizability [13].…”

Section: Resultsmentioning

confidence: 99%

3D-quantification of biomolecular covers using surface plasmon-polariton resonance experiment

Chegel¹,

Chegel²,

Guiver³

et al. 2008

Sensors and Actuators B: Chemical

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3-D quantification of biomolecular covers using surface plasmonpolariton resonance experiment Chegel, V.; Chegel, Yu.; Guiver, Michael; Lopatynskyi, A.; Lopatynska, O.; Lozovski, V. Sensors and Actuators B 134 (2008) The concentration of surface molecules N s and components of molecular susceptibility jl (ω) can both be determined from surface plasmon-polariton resonance (SPPR) experiments, instead of effective layer thickness and index of refraction, which are usually determined. The theoretical consideration of a molecular layer as monolayer of separated 3D-oscillators provides a new perspective for investigating molecules during SPPR experiment. It is shown that SPPR response and the form of the reflective curve depend on the form of a biomolecule and its orientation relative to the surface of the metal-carrier of plasmon oscillations. The experimental data for immunological reaction for the calculation of surface molecular concentration and mass of biomolecular covering are presented.

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Substrate effects on the optical properties of spheroidal nanoparticles

Cited by 47 publications

References 27 publications

Plasmonic Optical Properties and Applications of Metal Nanostructures

Plasmonic Optical Properties and Applications of Metal Nanostructures

Plasmonics Effects of Nanometal Embedded in a Dielectric Substrate

3D-quantification of biomolecular covers using surface plasmon-polariton resonance experiment

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