Gold Nanoparticles on Polarizable Surfaces as Raman Scattering Antennas

Chen, Shiuan Yeh; Mock, Jack J.; Hill, Ryan T.; Chilkoti, Ashutosh; Smith, David R.; Lazarides, Anne A.

doi:10.1021/nn101644s

Cited by 91 publications

(80 citation statements)

References 78 publications

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“…Electrical field enhancement requires proximal Ag nanoparticles which requires a considerable density or remnant Ag to be in close proximity and unimpeded by the Si matrix in which it sits, or else larger structures with sharply defined edge that are close together, in order to provide an plasmonic enhancement of vibrational signal of adsorbed moieties on the NWs. 57 Our EDX analysis suggests that the majority of the metallic Ag is removed and typically, only localized clumps remain, where found, rather than a distribution of metallic Ag at SERRS relative spatial densities within the roughened region of the surface. Clear signals from Ag 0 are characteristically found in areas with a larger density of wider diameter NWs indicating that the quantity and distribution are sufficiently small.…”

Section: B Compositional Characterization Of Etched P-type Si Nwsmentioning

confidence: 72%

Doping controlled roughness and defined mesoporosity in chemically etched silicon nanowires with tunable conductivity

McSweeney

Lotty

Mogili

et al. 2013

Journal of Applied Physics

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By using Si(100) with different dopant type (n++-type (As) or p-type (B)), we show how metal-assisted chemically etched (MACE) nanowires (NWs) can form with rough outer surfaces around a solid NW core for p-type NWs, and a unique, defined mesoporous structure for highly doped n-type NWs. We used high resolution electron microscopy techniques to define the characteristic roughening and mesoporous structure within the NWs and how such structures can form due to a judicious choice of carrier concentration and dopant type. The n-type NWs have a mesoporosity that is defined by equidistant pores in all directions, and the inter-pore distance is correlated to the effective depletion region width at the reduction potential of the catalyst at the silicon surface in a HF electrolyte. Clumping in n-type MACE Si NWs is also shown to be characteristic of mesoporous NWs when etched as high density NW layers, due to low rigidity (high porosity). Electrical transport investigations show that the etched nanowires exhibit tunable conductance changes, where the largest resistance increase is found for highly mesoporous n-type Si NWs, in spite of their very high electronic carrier concentration. This understanding can be adapted to any low-dimensional semiconducting system capable of selective etching through electroless, and possibly electrochemical, means. The process points to a method of multiscale nanostructuring NWs, from surface roughening of NWs with controllable lengths to defined mesoporosity formation, and may be applicable to applications where high surface area, electrical connectivity, tunable surface structure, and internal porosity are required

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Section: B Compositional Characterization Of Etched P-type Si Nwsmentioning

confidence: 72%

Doping controlled roughness and defined mesoporosity in chemically etched silicon nanowires with tunable conductivity

McSweeney

Lotty

Mogili

et al. 2013

Journal of Applied Physics

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“…The laterally polarized dipole component which is responsible for the green scattering spot was not considered in this calculation due to its small contribution to the main resonance peak. 5,6,19,20 …”

Section: Simulationmentioning

confidence: 99%

Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances

2015

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ARTICLE This journal isThe effect of nanoscale surface roughness on the surface plasmon resonance of gold nanoparticles on thermally evaporated gold films is investigated experimentally and numerically. Single-particle scattering spectra obtained from 80 nm diameter gold particles on a gold film show significant particle-to-particle variation of the peak scattering wavelength of ±28 nm. The experimental results are compared with numerical simulations of gold nanoparticles positioned on representative rough gold surfaces, modeled based on atomic force microscopy measurements. The predicted spectral variation and average resonance wavelength show good agreement with the measured data. The study shows that surface roughness can have a significant impact on the spectral performance of particlebased plasmonic devices.

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“…In the metallic nanoparticles and nanorods based on dipole resonances, strong local eld-enhancement can be achieved, [1][2][3] which has been exploited to improve spontaneous emission enhancement, 4 white light supercontinuum generation, 5 and surface enhanced Raman spectroscopy. 6,7 Beyond dipole plasmon mode, having access to higher order modes in eld expansion can provide fundamental control over optical elds to engineer electromagnetic parameters like phase, 8 polarization state, directions of radiation and optical angular momentum. 9 The capability to tune the plasmon resonance modes in optical nanoantennas has played a critical role in plasmonics.…”

Section: Introductionmentioning

confidence: 99%

Tunable plasmon modes in single silver nanowire optical antennas characterized by far-field microscope polarization spectroscopy

Qian

Long

et al. 2014

Nanoscale

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Performing far-field microscope polarization spectroscopy and finite element method simulations, we investigated experimentally and theoretically the surface plasmon modes in single Ag nanowire antennas.Our results show that the surface plasmon resonances in the single Ag nanowire antenna can be tuned from the dipole plasmon mode to a higher order plasmon mode, which would result in the emission with different intensities and polarization states, for the semiconductor quantum dots coupled to the nanowire antenna. The fluorescence polarization is changed with different polarized excitation of the 800 nm light beam, while it remains parallel to the Ag nanowire axis at the 400 nm excitation. The 800 nm incident light interacts nonresonantly with the dipole plasmon mode with the polarized excitation parallel to the Ag nanowire axis, while it excites a higher order plasmon mode with the perpendicular excitation. Under excitation of 400 nm, either the parallel or perpendicular excitation can only result in a dipole plasmon mode. In addition, we demonstrate that the single Ag nanowire antenna can work as an energy concentrator for enhancing the two-photon excited fluorescence of semiconductor quantum dots.

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Gold Nanoparticles on Polarizable Surfaces as Raman Scattering Antennas

Cited by 91 publications

References 78 publications

Doping controlled roughness and defined mesoporosity in chemically etched silicon nanowires with tunable conductivity

Doping controlled roughness and defined mesoporosity in chemically etched silicon nanowires with tunable conductivity

Effect of surface roughness on substrate-tuned gold nanoparticle gap plasmon resonances

Tunable plasmon modes in single silver nanowire optical antennas characterized by far-field microscope polarization spectroscopy

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