Controlled synthesis and quantum-size effect in gold-coated nanoparticles

Zhou, Hongyao; Honma, Itaru; Komiyama, Hiroshi; Haus, Joseph W.

doi:10.1103/physrevb.50.12052

Cited by 256 publications

(202 citation statements)

References 14 publications

Supporting

Mentioning

193

Contrasting

Unclassified

Order By: Relevance

“…The surface plasmon resonance is found to be shifted in nanoparticles coated with gold [7]. The optical properties of nanoparticles may also be affected by quantum size effects [8]. In general, it is expected that the local field effects play a significant role in the nonlinear response in composites consisting of small particles as the response depends on high powers of the field [9].…”

Section: Introductionmentioning

confidence: 99%

Second-harmonic generation for a dilute suspension of coated particles

Hui

Stroud

2004

Phys. Rev. B

View full text Add to dashboard Cite

We derive an expression for the effective second-harmonic coefficient of a dilute suspension of coated spherical particles. It is assumed that the coating material, but not the core or the host, has a nonlinear susceptibility for second-harmonic generation (SHG). The resulting compact expression shows the various factors affecting the effective SHG coefficient. The effective SHG per unit volume of nonlinear coating material is found to be greatly enhanced at certain frequencies, corresponding to the surface plasmon resonance of the coated particles. Similar expression is also derived for a dilute suspension of coated discs. For coating materials with third-harmonic (THG) coefficient, results for the effective THG coefficients are given for the cases of coated particles and coated discs.

show abstract

Section: Introductionmentioning

confidence: 99%

Second-harmonic generation for a dilute suspension of coated particles

Hui

Stroud

2004

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…However, in the case of thin layers we should take into consideration the quantum effects of finite size [54]. Tabulated values of ε i should be replaced by the following correction:…”

Section: Finite-size Effectsmentioning

confidence: 99%

“…where ω = 2πc/λ is the frequency of incident radiation; ω p is the plasma frequency; γ bulk is the relaxation constant for a bulk and γ fin is [54]:…”

Section: Finite-size Effectsmentioning

confidence: 99%

See 1 more Smart Citation

New ideally absorbing Au plasmonic nanostructures for biomedical applications

Zakomirnyi

Rasskazov

Карпов

et al. 2017

Journal of Quantitative Spectroscopy and Radiative Transfer

View full text Add to dashboard Cite

In this paper a new set of plasmonic nanostructures operating at the conditions of an ideal absorption [1] was proposed for novel biomedical applications. We consider spherical x/Au nanoshells and Au/x/Au nanomatryoshkas, where 'x' changes from conventional Si and SiO 2 to alternative plasmonic materials [2], such as zinc oxide doped with aluminum, gallium and indium tin oxide. The absorption peak of proposed nanostructures lies within 700-1100nm wavelength region and corresponds to the maximal optical transparency of hemoglobin and melanin as well as to the radiation frequency of available pulsed medical lasers. It was shown that the ideal absorption takes place in a given wavelength region for Au coatings with thickness less than 12nm. In this case finite quantum size effects for metallic nanoshells play significant role. The mathematical model for the search of the ideal absorption conditions was modified by taking into account the finite quantum size effects.

show abstract

“…An enhancement of the local field by a factor 10 is expected around 500 nm, close to the surface plasmon resonance. Preliminary experiments on Au2 S particles coated with gold have been recently realized [35].…”

Section: Melallic Coatingmentioning

confidence: 99%

Light Emission by Semiconductor Nanostructures in Dielectric Medium or Close to Plane Interface

Lavallard

1996

Acta Phys. Pol. A

View full text Add to dashboard Cite

We review several situations in which the emission rate of a nanostructure is modified by its environment. We first consider smaJl objects embedded in media with different refractive indices. The local electromagnetic field and the rate of spontaneous emission of the nanostructure are enhanced or inhibited by the induced dipole charges on the interface. In quantum wells or nanocrystals embedded in a low dielectric constant medium, the binding energy of excitons is increased. In anisotropic microcrystals, the local field is anisotropic and emission of light is polarized. We consider especially the case of p+-doped porous silicon in which nanocrystals are elongated. Another interesting situation occurs when a dipole is in the vicinity of a dielectric interface. The local field acting on the dipole results from the interferences of incident and reflected beams. Contributions from evanescent waves are important when the dipole is located in the medium of low refractive index, very close to the surface. The intensity of emission and its pattern are modified by the vicinity of the dielectric interface. Close to the interface semiconductor/air, the exciton binding energy is increased. In the vicinity of a metallic surface, á nonradiative transfer to the metal occurs for small distances of the nano-object or quantum weJl to the surface and the quantum efficiency varies with the distance to the metallic surface. The exciton binding energy of a quantum well is decreased close to a metallic surface.PACS numbers: 78.20.Βh, 78.55.Cr, 78.55.Et 1. Introduction The rate of spontaneous emission of a dipole is not an intrinsic property of the dipole but depends on its environment [1]: dielectric medium [2-5], dielectric interface [6][7][8], metallic interface [9,10] or cavity [11]. The modification of the emission rate of a dipole has been studied theoretically for many years. Numerous experimental studies have been done either with fluorescent ions or dye moleculeS [12][13][14][15][16][17]. In semiconductor physics the effect of a cavity on the rate of spontaneous emission of a quantum well was recognized recently [18,19], and during the last years, only a few studies have been done on the effect of a dielectric

show abstract

Controlled synthesis and quantum-size effect in gold-coated nanoparticles

Cited by 256 publications

References 14 publications

Second-harmonic generation for a dilute suspension of coated particles

Second-harmonic generation for a dilute suspension of coated particles

New ideally absorbing Au plasmonic nanostructures for biomedical applications

Light Emission by Semiconductor Nanostructures in Dielectric Medium or Close to Plane Interface

Contact Info

Product

Resources

About