Journal ArticleDOI
Universal Scaling of Plasmon Coupling in Metal Nanostructures: Extension from Particle Pairs to Nanoshells
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This letter proposes a simple expression for predicting the dipolar plasmon resonance of a silica-gold nanoshell of given dimensions, and uses the universal scaling behavior in the Nanoshell system to extend it to the dielectric core-metal shell nanostructure.Abstract:
It has been recently shown that the strength of plasmon coupling between a pair of plasmonic metal nanoparticles falls as a function of the interparticle gap scaled by the particle size with a near-exponential decay trend that is universally independent of nanoparticle size, shape, metal type, or medium dielectric constant. In this letter, we extend this universal scaling behavior to the dielectric core-metal shell nanostructure. By using extended Mie theory simulations of silica core-metal nanoshells, we show that when the shift of the nanoshell plasmon resonance wavelength scaled by the solid nanosphere resonance wavelength is plotted against the shell thickness scaled by the core radius, nanoshells with different dimensions (radii) exhibit the same near-exponential decay. Thus, the nanoshell system becomes physically analogous to the particle-pair system, i.e., the nanoshell plasmon resonance results from the coupling of the inner shell surface (cavity) and the outer shell surface (sphere) plasmons over a separation distance essentially given by the metal shell thickness, which is consistent with the plasmon hybridization model of Prodan, Halas, and Nordlander. By using the universal scaling behavior in the nanoshell system, we propose a simple expression for predicting the dipolar plasmon resonance of a silica-gold nanoshell of given dimensions.read more
Citations
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Noble Metals on the Nanoscale: Optical and Photothermal Properties and Some Applications in Imaging, Sensing, Biology, and Medicine
TL;DR: How the unique tunability of the plasmon resonance properties of metal nanoparticles through variation of their size, shape, composition, and medium allows chemists to design nanostructures geared for specific bio-applications is emphasized.
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Plasmons in strongly coupled metallic nanostructures.
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Gold Nanorods: From Synthesis and Properties to Biological and Biomedical Applications
TL;DR: Of all the possible nanoparticle shapes, gold nanorods are especially intriguing as they offer strong plasmonic fields while exhibiting excellent tunability and biocompatibility, according to a review of their radiative and nonradiative properties.
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Gold nanoparticles: Optical properties and implementations in cancer diagnosis and photothermal therapy
TL;DR: The surface plasmon resonance of gold nanoparticles leads to strong electromagnetic fields on the particle surface and consequently enhances all the radiative properties such as absorption and scattering as discussed by the authors, and the strongly absorbed light is converted to heat quickly via a series of nonradiative processes.
Journal ArticleDOI
Surface plasmon resonance in gold nanoparticles: a review.
TL;DR: The general overview of the field and the background for appropriate modelling of the physical phenomena are provided and the current state of the art and most recent applications of plasmon resonance in Au NPs are reported.
References
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Journal ArticleDOI
The Optical Properties of Metal Nanoparticles: The Influence of Size, Shape, and Dielectric Environment
TL;DR: In this paper, the authors describe recent progress in the theory of nanoparticle optical properties, particularly methods for solving Maxwell's equations for light scattering from particles of arbitrary shape in a complex environment.
Journal ArticleDOI
Nanoshell-mediated near-infrared thermal therapy of tumors under magnetic resonance guidance
Leon R. Hirsch,R.J. Stafford,James A. Bankson,S.R. Sershen,Belinda Rivera,Roger E. Price,John D. Hazle,Nancy J. Halas,Jennifer L. West +8 more
TL;DR: In vivo studies under magnetic resonance guidance revealed that exposure to low doses of NIR light in solid tumors treated with metal nanoshells reached average maximum temperatures capable of inducing irreversible tissue damage, and found good correlation with histological findings.
Journal ArticleDOI
A hybridization model for the plasmon response of complex nanostructures.
TL;DR: A simple and intuitive picture that describes the plasmon response of complex nanostructures of arbitrary shape is presented, an electromagnetic analog of molecular orbital theory, that can be understood as the interaction or "hybridization" of elementary plasmons supported by nanostructure of elementary geometries.
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The use of nanocrystals in biological detection
TL;DR: The emerging ability to control the patterns of matter on the nanometer length scale can be expected to lead to entirely new types of biological sensors capable of sensing at the single-molecule level in living cells, and capable of parallel integration for detection of multiple signals.
Journal ArticleDOI
Shape and size dependence of radiative, non-radiative and photothermal properties of gold nanocrystals
Stephan Link,Mostafa A. El-Sayed +1 more
TL;DR: In this article, the physical origin of surface plasmon absorption in gold nanoparticles with emphasis on the Mie and also the Maxwell-Garnett theory is discussed. And the effects of particle size and shape on the resonance condition are reviewed.