Plasmonic Nanoantennas: Angular Scattering Properties of Multipole Resonances in Noble Metal Nanorods

Encina, Ezequiel Roberto; Coronado, Eduardo A.

doi:10.1021/jp7120142

Cited by 52 publications

(70 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For shorter NWs with considerably smaller aspect ratio the contribution of sub-and super-radiant modes becomes more significant. 32,35,36 We fitted all experimental BFP patterns with a combination of the NW pattern I NW and the pattern consisting of randomly oriented dipoles I NC : (7) After adjusting the orientation angle Ψ with respect to the NW axis the free fit parameters were the amplitudes of the different channel contributions D and W, the real part of the plasmon wavevector together with the propagation length L D , the wire length L and the NC position a. Representative fits of experimental BFP patterns are shown in Figure 3 (e)-(f) and in the Supporting Info, Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Radiation Channels Close to a Plasmonic Nanowire Visualized by Back Focal Plane Imaging

et al. 2013

View full text Add to dashboard Cite

We investigated the angular radiation patterns, a key characteristic of an emitting system, from individual silver nanowires decorated with rare earth ion-doped nanocrystals. Back focal plane radiation patterns of the nanocrystal photoluminescence after local two-photon excitation can be described by two emission channels: Excitation of propagating surface plasmons in the nanowire followed by leakage radiation and direct dipolar emission observed also in the absence of the nanowire. Theoretical modeling reproduces the observed radiation patterns which strongly depend on the position of excitation along the nanowire. Our analysis allows to estimate the branching ratio into both emission channels and to determine the diameter dependent surface plasmon quasimomentum, important parameters of emitter-plasmon structures. KeywordsPlasmonics; metallic nanowires; rare earth ions; back focal plane imaging; up-conversion Propagating surface plasmon polaritons (SPPs) are electromagnetic waves bound to a metaldielectric interface. They offer the distinguished possibility to concentrate light to subwavelength scales and transport this energy over a length several magnitudes larger. [1][2][3][4] These properties provide the basis for plasmonics, a very active research area aiming at optical device miniaturization and the integration of optics and electronics on a single chip. 5,6 Metallic nanowires (NWs) have drawn particular attention as plasmonic building blocks due to their successful implementation as waveguides, 7-9 routers and logic gates. 10-12 SPPs on metallic NWs have been investigated by direct visualization, 13 using a scanning aperture probe, 14 by electrical detection 15 as well as by calculations. 16 A key step in plasmonic applications of NWs is the coupling of the initial energy source to the NW and the contributing energy relaxation pathways. 17,18 Importantly, subwave-length light confinement by the SPPs can be used to enhance the interaction between objects and light. 19 This coupling and the excitation and propagation of SPPs have been experimentally visualized by leakage radiation microscopy 20-22 combined with imaging of the back focal plane (BFP) for a variety of plasmonic structures and devices. [23][24][25] In this manuscript we studied the coupling of the emission from rare earth doped nanocrystals to SPP modes in silver NWs on glass. We use the ability of these nanocrystals to exhibit stable, non-bleaching upconverted photoluminescence (PL) on the anti-Stokes side * To whom correspondence should be addressed achim.hartschuh@cup.uni-muenchen.de. Europe PMC Funders Group Europe PMC Funders Author ManuscriptsEurope PMC Funders Author Manuscripts of the laser energy 26 to avoid temporal intensity fluctuations and to exclude any background contribution from laser scattering, metal luminescence or the sample substrate. Importantly, since two-photon excitation requires high excitation densities it will only be efficient at the position of the laser focus. Two-photon excitation of NCs located outsid...

show abstract

Section: Resultsmentioning

confidence: 99%

Radiation Channels Close to a Plasmonic Nanowire Visualized by Back Focal Plane Imaging

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Our numerical calculations are based on simple non-chiral geometries, via exciting the first few orders of multipolar SP resonance. In the literature, the phenomena of multipolar SP resonance of metallic nanoparticles have been widely reported for various symmetry-breaking geometries [43][44][45][46][47][48][49][50], including the flat triangular nanoprisms [51][52][53] used in this work. We show that the angular momentum carried by the scattered field depends greatly on the azimuthal charge distribution on the plasmonic surface, which is governed by the order of the multipolar SP resonance.…”

Section: Introductionmentioning

confidence: 99%

Optical torque from enhanced scattering by multipolar plasmonic resonance

Lee

Fung²,

Jin

et al. 2014

Nanophotonics

View full text Add to dashboard Cite

Abstract:We present a theoretical study of the optical angular momentum transfer from a circularly polarized plane wave to thin metal nanoparticles of different rotational symmetries. While absorption has been regarded as the predominant mechanism of torque generation on the nanoscale, we demonstrate numerically how the contribution from scattering can be enhanced by using multipolar plasmon resonance. The multipolar modes in non-circular particles can convert the angular momentum carried by the scattered field and thereby produce scattering-dominant optical torque, while a circularly symmetric particle cannot. Our results show that the optical torque induced by resonant scattering can contribute to 80% of the total optical torque in gold particles. This scattering-dominant torque generation is extremely mode-specific, and deserves to be distinguished from the absorption-dominant mechanism. Our findings might have applications in optical manipulation on the nanoscale as well as new designs in plasmonics and metamaterials.

show abstract

“…16 Recently, the Fano-like line shape of multipolar plasmon resonance has attracted particular attention as a medium for understanding B plasmonic interference phenomena. 7,17,18 Furthermore, multipolar plasmon modes of different orders show distinct radiation properties, 5,19 which opens new possibilities for light manipulation, nanoantenna design, and fluorescence control. 20,21 These unique properties of multipolar plasmon resonance create many new opportunities for nanoplasmonic and nanophotonic applications.…”

mentioning

confidence: 99%

Gold Nanobipyramid-Directed Growth of Length-Variable Silver Nanorods with Multipolar Plasmon Resonances

et al. 2015

View full text Add to dashboard Cite

We report on a method for the preparation of uniform and length-variable Ag nanorods through anisotropic Ag overgrowth on high-purity Au nanobipyramids. The rod diameters can be roughly tailored from ∼20 nm to ∼50 nm by judicious selection of differently sized Au nanobipyramids. The rod lengths can be tuned from ∼150 nm to ∼550 nm by varying the Ag precursor amount during the overgrowth process and/or by anisotropic shortening through mild oxidation. The controllable aspect ratios, high purity, and high dimensional uniformity of these Ag nanorods enable the observation of Fabry-Pérot-like multipolar plasmon resonance modes in the colloidal suspensions at the ensemble level, which has so far been demonstrated only on Au nanorods prepared electrochemically with anodic aluminum oxide templates. Depending on the mode order and geometry of the Ag nanorods, the multipolar plasmon wavelengths can be readily tailored over a wide spectral range from the visible to near-infrared region. We have further elucidated the relationships between the multipolar plasmon wavelengths and the geometric dimensions of the Ag nanorods at both the ensemble and single-particle levels. Our results indicate that the Au nanobipyramid-directed, dimensionally controllable Ag nanorods will be an attractive and promising candidate for developing multipolar plasmon-based devices and applications.

show abstract

Plasmonic Nanoantennas: Angular Scattering Properties of Multipole Resonances in Noble Metal Nanorods

Cited by 52 publications

References 42 publications

Radiation Channels Close to a Plasmonic Nanowire Visualized by Back Focal Plane Imaging

Radiation Channels Close to a Plasmonic Nanowire Visualized by Back Focal Plane Imaging

Optical torque from enhanced scattering by multipolar plasmonic resonance

Gold Nanobipyramid-Directed Growth of Length-Variable Silver Nanorods with Multipolar Plasmon Resonances

Contact Info

Product

Resources

About