Influence of Cross Sectional Geometry on Surface Plasmon Polariton Propagation in Gold Nanowires

Nauert, Scott L.; Paul, Aniruddha; Zhen, Yu-Rong; Solís, David; Vigderman, Leonid; Zubarev, Eugene R.; Nordlander, Peter; Link, Stephan

doi:10.1021/nn405183r

Cited by 41 publications

(58 citation statements)

References 52 publications

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“…1. It is important to note that the growth solution contains some Hofmeister anions from the beginning, such as bromide (from CTAB), nitride (from AgNO 3 . 45 The rest of the four salts did allow the synthesis of Au NRs and more importantly tuned the L-LSPR band either to longer or shorter wavelengths.…”

Section: Resultsmentioning

confidence: 99%

Fine-tuning of gold nanorod dimensions and plasmonic properties using the Hofmeister effects

et al. 2016

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Gold nanorods (Au NRs) present unique optical and electronic properties that depend on their morphology. Their applications in sensing and therapeutics require easy syntheses with a precise control over their dimensions. Here, we report a method for the synthesis of highly pure and monodisperse Au NRs with fine-tuneable dimensions and longitudinal localised surface plasmon resonance by addition of Hofmeister salts into the growth medium. The control of Au NR formation relies on the double interaction between the salt-gold and salt-surfactant (cetyl trimethylammonium bromide, CTAB). With the addition of Hofmeister salts (i.e. NaNO3, NaBr, NaCl and NaHSO4) we can fine-tune the aspect ratio of Au NRs in the range of 3.3 to 4.8 with a precision of 0.1 and the longitudinal adsorption band from 777 to 960 nm. In addition, we have studied the physical changes of the CTAB micelles induced by the salts using rheology, microscopy and lightscattering techniques. We report for the first time electron microscopy imaging of the micelles under Au NR growth conditions. With the comprehensive characterization of CTAB micelle in the growth solution, this study provides a deeper understanding of the anisotropic growth of metallic crystals. have low affinity for gold, like nitrate, bisulphate and chloride, their addition yields longer aspect ratio rods. However, anions with high affinity for gold, like bromide, reduce the gold deposition, producing shorter aspect ratio rods. Interestingly, CTAB micelles are mainly sphere-shaped in all solutions. The addition of salt increases the overall micelle size by increasing the non-spherical micelle population, although spherical shape is still the predominant one. Hence, these results provide not just a new strategy for the precise tuning of the optical properties and morphology of Au NRs, but also a deeper understanding of the anisotropic growth mechanism of the nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Fine-tuning of gold nanorod dimensions and plasmonic properties using the Hofmeister effects

et al. 2016

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“…Specifically, crystalline silver nanowires present a pentagonal cross-section shape leading to strong mode confinement at the corners (see Fig. 12) [134,149]. This mode confinement significantly increases the Purcell factor near the edge of the nanowire compared to a circular nanowire [105].…”

Section: Purcell Factor Near a Plasmonic Waveguidementioning

confidence: 99%

Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources

Francs

Barthès

Bouhélier

et al. 2016

J. Opt.

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Abstract. The Purcell factor Fp is a key quantity in cavity quantum electrodynamics (cQED) that quantifies the coupling rate between a dipolar emitter and a cavity mode. Its simple form Fp ∝ Q/V unravels the possible strategies to enhance and control light-matter interaction. Practically, efficient light-matter interaction is achieved thanks to either i) high quality factor Q at the basis of cQED or ii) low modal volume V at the basis of nanophotonics and plasmonics. In the last decade, strong efforts have been done to derive a plasmonic Purcell factor in order to transpose cQED concepts to the nanocale, in a scale-law approach. In this work, we discuss the plasmonic Purcell factor for both delocalized (SPP) and localized (LSP) surface-plasmon-polaritons and briefly summarize the expected applications for nanophotonics. On the basis of the SPP resonance shape (Lorentzian or Fano profile), we derive closed form expression for the coupling rate to delocalized plasmons. The quality factor factor and modal confinement of both SPP and LSP are quantified, demonstrating their strongly subwavelength behaviour.

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“…The propagation length is related to not only the diameter of the nanowires, but also to the cross section shape. As shown in Figure 9, Nauert et al [110] investigated the pentagonal and five pointed star cross section of GNWs. They addressed how the cross section and SPP mode number influenced the absorptive and radiative losses.…”

Section: Recent Development In the Use Of Gold Nanoparticles Basedmentioning

confidence: 99%

“…GNWs with a five-point star cross section have a shorter propagation length and a higher coupling efficiency than those with a pentagonal cross section. This is because the electric fields are located at the sharp ridges of GNWs, which leads to higher absorptive losses [110], while scattering losses were found to be dependent on the plasmon mode rather than cross sectional geometry.…”

Section: Recent Development In the Use Of Gold Nanoparticles Basedmentioning

confidence: 99%

New Gold Nanostructures for Sensor Applications: A Review

et al. 2014

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Gold based structures such as nanoparticles (NPs) and nanowires (NWs) have widely been used as building blocks for sensing devices in chemistry and biochemistry fields because of their unusual optical, electrical and mechanical properties. This article gives a detailed review of the new properties and fabrication methods for gold nanostructures, especially gold nanowires (GNWs), and recent developments for their use in optical and electrochemical sensing tools, such as surface enhanced Raman spectroscopy (SERS).

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Influence of Cross Sectional Geometry on Surface Plasmon Polariton Propagation in Gold Nanowires

Cited by 41 publications

References 52 publications

Fine-tuning of gold nanorod dimensions and plasmonic properties using the Hofmeister effects

Fine-tuning of gold nanorod dimensions and plasmonic properties using the Hofmeister effects

Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources

New Gold Nanostructures for Sensor Applications: A Review

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