Anisotropic nonlinear optical absorption of gold nanorods in a silica matrix

Lamarre, J.-M.; Billard, F.; Kerboua, Chahineze Harkati; Lequime, Michel; Roorda, S.; Martinů, L.

doi:10.1016/j.optcom.2007.09.018

Cited by 51 publications

(24 citation statements)

References 37 publications

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“…[113] Also showing anisotropy is the collective response from aligned nanorods embedded in a silica matrix, formed through the directional bombardment of nanospheres with heavy ions. [115] Lamarre et al [116] used such samples to conduct a systematic study of the polarization-dependent nonlinear effects. Their study, based on l ¼ 532 nm irradiances below 5 GW cm À2 , yielded a nonlinear saturable absorption, where the nonlinear absorption coefficient was 5.7 times larger along the long axis of the nanorod.…”

Section: à2mentioning

confidence: 99%

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

2009

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Noble metal nanoparticles are capable of confining resonant photons in such a manner as to induce coherent surface plasmon oscillation of their conduction band electrons, a phenomenon leading to two important properties. Firstly, the confinement of the photon to the nanoparticle's dimensions leads to a large increase in its electromagnetic field and consequently great enhancement of all the nanoparticle's radiative properties, such as absorption and scattering. Moreover, by confining the photon's wavelength to the nanoparticle's small dimensions, there exists enhanced imaging resolving powers, which extend well below the diffraction limit, a property of considerable importance in potential device applications. Secondly, the strongly absorbed light by the nanoparticles is followed by a rapid dephasing of the coherent electron motion in tandem with an equally rapid energy transfer to the lattice, a process integral to the technologically relevant photothermal properties of plasmonic nanoparticles. Of all the possible nanoparticle shapes, gold nanorods are especially intriguing as they offer strong plasmonic fields while exhibiting excellent tunability and biocompatibility. We begin this review of gold nanorods by summarizing their radiative and nonradiative properties. Their various synthetic methods are then outlined with an emphasis on the seed-mediated chemical growth. In particular, we describe nanorod spontaneous self-assembly, chemically driven assembly, and polymer-based alignment. The final section details current studies aimed at applications in the biological and biomedical fields.

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Section: à2mentioning

confidence: 99%

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

2009

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“…Actually, the composite nanomaterials have a synergistic effect of each component [18]. In comparison to the individual components, the composites could exhibit better physical, chemical properties, and performance characteristics [19,20]. Therefore, the SiO 2 /Au composite nanoparticles were hopeful to obtain good conductivity and favorable environment to retain the enzyme activity.…”

Section: Introductionmentioning

confidence: 99%

Enzyme biosensor based on the immobilization of HRP on SiO2/BSA/Au composite nanoparticles

Yuan

Zhuo

et al. 2010

Appl Biochem Biotechnol

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In this work, an enzyme biosensor based on the immobilization of horseradish peroxidase (HRP) on SiO₂/BSA/Au/thionine/nafion-modified gold electrode was fabricated successfully. Firstly, nafion was dropped on the surface of the gold electrode to form a nafion film followed by chemisorption of thionine (Thi) as an electron mediator via the ion-exchange interaction between the Thi and nafion. Subsequently, the SiO₂/BSA/Au composite nanoparticles were assembled onto Thi film through the covalent bounding with the amino groups of Thi. Finally, HRP was immobilized on the SiO₂/BSA/Au composite nanoparticles due to the covalent conjugation to construct an enzyme biosensor. The surface topographies of the SiO₂/BSA/Au composite nanoparticles were investigated by using scanning electronic microscopy. The stepwise self-assemble procedure of the biosensor was further characterized by means of cyclic voltammetry and chronoamperometry. The enzyme biosensor showed high sensitivity, good stability and selectivity, a wide linear response to hydrogen peroxide (H₂O₂) in the range of 8.0 x 10⁻⁶ ~3.72 x 10⁻³ mol/L, with a detection limit of 2.0 x 10⁻⁶ mol/L. The Michaelies-Menten constant K(app)(M) value was estimated to be 2.3 mM.

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“…Since AuNRs can provide intensive local electromagnetic fields and large field enhancements [268], there are impressive nonlinear properties leading to applications such as optical devices [269]. AuNRs show important potential in metamaterials, e.g.…”

Section: Optical Tuningmentioning

confidence: 99%

Anisotropic Gold Nanoparticles: Preparation, Properties, and Applications

Xue

2015

Anisotropic Nanomaterials

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Anisotropic metal nanoparticles with a catalog of promising anisotropic electronic, optical, and chemical properties have been regarded as enabling building blocks in the bottom-up fabrication of functional materials and devices. Specifically, anisotropic gold nanoparticles are currently emerging as fascinating materials due to their unique shape-, size-, and surface-dependent properties. In this chapter, we present the synthesis, properties and applications of different one-, twoand three-dimensional anisotropic gold nanoparticles (AuNPs). The most widely adopted top-down and bottom-up synthesis approaches have been discussed in addition to some of the recently introduced new methods for the fabrication of differently shaped anisotropic AuNPs. The optical property, photothermal effect, surface enhanced Raman scattering, fluorescence enhancement and quenching, surface modification, toxicology, and supramolecular organizations of anisotropic AuNPs have been highlighted. Various practical and potential applications of anisotropic AuNPs in catalysis, sensing, photothermal therapy, drug and gene delivery, and biological and biomedical areas are briefly outlined.

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Anisotropic nonlinear optical absorption of gold nanorods in a silica matrix

Cited by 51 publications

References 37 publications

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications

Enzyme biosensor based on the immobilization of HRP on SiO2/BSA/Au composite nanoparticles

Anisotropic Gold Nanoparticles: Preparation, Properties, and Applications

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