Selective Excitation of Individual Plasmonic Hotspots at the Tips of Single Gold Nanostars

Hrelescu, Calin; Sau, Tapan K.; Rogach, Andrey L.; Jäckel, Frank; Laurent, Guillaume; Douillard, Ludovic; Charra, Fabrice

doi:10.1021/nl103007m

Cited by 182 publications

(183 citation statements)

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“…Modern chemical methods for production such particles are able to provide almost atomically sharp edges in the crystallographic directions [18][19][20]. Synthesis of metal nanostars has allowed recently to strongly enhance the near fields at the plasmonic resonance [21].In this Letter, we predict and analyze a strong impact of corners of metal nanoparticles on fundamental plasmonic properties. Both the spectrum and the spatial structure of the plasmonic modes are strongly affected by the corners showing simple and universal features.…”

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Metal nanoparticles with sharp corners: Universal properties of plasmon resonances

Sturman¹,

Podivilov²,

Gorkunov³

2013

EPL

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We predict the simultaneous occurrence of two fundamental phenomena for metal nanoparticles possessing sharp corners: First, the main plasmonic dipolar mode experiences strong red shift with decreasing corner curvature radius; its resonant frequency is controlled by the apex angle of the corner and the normalized (to the particle size) corner curvature. Second, the split-off plasmonic mode experiences strong localization at the corners. Altogether, this paves the way for tailoring of metal nano-structures providing wavelength-selective excitation of localized plasmons and a strong near-field enhancement of linear and nonlinear optical phenomena.PACS numbers: 73.20. Mf, 42.25.Fx, 78.40.Kc Plasmon excitations of metal nanoparticles, including 2D particles (nanowires), is a vast and hot research area. Potential applications of nano-plasmons span from nanolasers (spasers) [1-3] to bio-sensors and sensors of single atoms and molecules [4,5]. It is highly important to apprehend the possibilities of tailoring of plasmonic resonances and the extends of concentration of the light energy deeply on the sub-wavelength scale.Analytical plasmonic solutions to Maxwell's equations are available only for metal nanoparticles of simplest 2D and 3D shapes -like circular cylinder, sphere, and ellipsoid [6,7]. They include the optical permittivity of the Using direct numerical methods, serious efforts have been undertaken to ascertain the phenomenology of the plasmonic response of 2D and 3D particles of more complicated shapes [8][9][10][11]. The general outcome is that the deviations from the most symmetric shapes result in enriching plasmon spectrum and in the appearance of new red-shifted resonances. In the 2D case, the strongest shape effects were found for triangular cross-sections.Regardless of the plasmonic effects, the presence of sharp tips and corners (metal or dielectric) is known to lead to the corner singularities, i.e., to a strong local enhancement of electromagnetic fields [12,13]. At the same time, the impact of tips and corners on the plasmonic properties of nanoparticles remains in essence unexplored. In numerical simulations, the sharp surface features are typically rounded to avoid numerical instabilities. Non-rounded π/2-corners lead to divergence of numerical methods for ε M → −3 [14]. Mathematical foundations of the plasmonic theory [15,16] refer to sufficiently smooth (Lyapunov) surfaces. A recent heuristic attempt to deal with plasmonic properties of nanoparticles possessing perfectly sharp features [17] is strongly unconvincing.Experimentally, the presence of sharp features of metal nanoparticles is far from exotic. Modern chemical methods for production such particles are able to provide almost atomically sharp edges in the crystallographic directions [18][19][20]. Synthesis of metal nanostars has allowed recently to strongly enhance the near fields at the plasmonic resonance [21].In this Letter, we predict and analyze a strong impact of corners of metal nanoparticles on fundamental plasmonic properties...

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confidence: 95%

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Metal nanoparticles with sharp corners: Universal properties of plasmon resonances

Sturman¹,

Podivilov²,

Gorkunov³

2013

EPL

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“…[14][15][16] Due to their localized surface plasmon resonances, noble metal nanoparticles provide strongly enhanced and highly localized electromagnetic fields close to their surface. 17 Their optical and field-enhancing properties allow for manipulating and enhancing fluorescence, Raman scattering, charge and energy transfer, and local temperature. [18][19][20][21] The surface plasmon resonances can be tuned through controlling size, shape and material of the nanoparticles via advanced colloidal chemistry.…”

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Enhancing Single-Nanoparticle Surface-Chemistry by Plasmonic Overheating in an Optical Trap

Lutich

et al. 2012

Nano Lett.

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Surface-chemistry of individual, optically trapped plasmonic nanoparticles is modified and accelerated by plasmonic overheating. Depending on the optical trapping power, gold nanorods can exhibit red-shifts of their plasmon resonance (i.e. increasing aspect ratio) under oxidative conditions. In contrast, in bulk exclusively blue shifts (decreasing aspect ratios) are observed. Supported by calculations, we explain this finding by local temperatures in the trap exceeding the boiling point of the solvent which can not be achieved in bulk.Keywords noble metal nanoparticles; plasmon resonance; colloidal chemistry; nano-/microfluidics; gold nanorods; plasmonic heating Miniaturization is a successful approach to faster, more efficient applications in physics and chemistry. In chemistry, the reduction of reaction volumes is expected to lead to highthroughput, portable analytical and sensing applications, and fundamental insights into single-molecule chemical reactions. [1][2][3] Lab-on-a-chip applications frequently employ microor nanofluidic structures. [4][5][6][7] However, these approaches do not change the outcome of a chemical reaction. Optical trapping on the other hand, being compatible with micro-or nanofluidic systems, is a well-established technique that has been widely applied to singlemolecule force and optical spectroscopy, non-invasive manipulation, and chemical reactions monitoring . [8][9][10][11][12][13] More recently, optical trapping has been applied to plasmonic noble metal nanoparticles. [14][15][16] Due to their localized surface plasmon resonances, noble metal nanoparticles provide strongly enhanced and highly localized electromagnetic fields close to their surface. 17 Their optical and field-enhancing properties allow for manipulating and enhancing fluorescence, Raman scattering, charge and energy transfer, and local temperature. [18][19][20][21] The surface plasmon resonances can be tuned through controlling size, shape and material of the nanoparticles via advanced colloidal chemistry. 22 Gold nanorods for instance, display two different plasmon modes: one transversal, in which the electrons oscillate perpendicular to the long axis of the rod, and the other red shifted longitudinal, in which the electrons oscillate along the long axis of the nanorod. 23 Europe PMC Funders Author Manuscripts sensitively depends on the nanorod's aspect ratio: the higher the aspect ratio, the more red shifted the longitudinal plasmon resonance.Here we apply the plasmonic heating effect of a single gold nanoparticle in an optical trap to both accelerate and modify chemical reactions on the surface of the particle. We show that individual optically trapped plasmonic particles modify and accelerate surface-chemistry by plasmonic overheating to yield different and faster results than the corresponding bulk reactions. Individual gold nanorods under oxidative conditions can display a red-shift of their localized surface plasmon resonances corresponding to an increasing aspect ratio, while in bulk exclusively bl...

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“…100 This application can be essential for the fabrication of optoelectronic devices and sensors. [101][102][103] The printing technique itself can be controlled in a way that is very gentle to the individual precursors. It was shown by Do et al that it is possible to print nanoparticles fabricated with an attached nanopropeller made from a DNA-origami structure without destroying these hybrid nanostructures.…”

Section: Nanofabricationmentioning

confidence: 99%

Optical trapping and manipulation of plasmonic nanoparticles: fundamentals, applications, and perspectives

et al. 2014

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This feature article discusses the optical trapping and manipulation of plasmonic nanoparticles, an area of current interest with potential applications in nanofabrication, sensing, analytics, biology and medicine. We give an overview over the basic theoretical concepts relating to optical forces, plasmon resonances and plasmonic heating. We discuss fundamental studies of plasmonic particles in optical traps and the temperature profiles around them. We place a particular emphasis on our own work employing optically trapped plasmonic nanoparticles towards nanofabrication, manipulation of biomimetic objects and sensing.

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Selective Excitation of Individual Plasmonic Hotspots at the Tips of Single Gold Nanostars

Cited by 182 publications

References 40 publications

Metal nanoparticles with sharp corners: Universal properties of plasmon resonances

Metal nanoparticles with sharp corners: Universal properties of plasmon resonances

Enhancing Single-Nanoparticle Surface-Chemistry by Plasmonic Overheating in an Optical Trap

Optical trapping and manipulation of plasmonic nanoparticles: fundamentals, applications, and perspectives

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