Pronounced Effects of Anisotropy on Plasmonic Properties of Nanorings Fabricated by Electron Beam Lithography

Near, Rachel D.; Tabor, Christopher E.; Duan, Jingliang; Pachter, Ruth; El‐Sayed, Mostafa A.

doi:10.1021/nl300622p

Cited by 111 publications

(89 citation statements)

References 58 publications

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“…The powerful electron beam tool provided precise structuring at the nanoscale, 21 which allowed us to fabricate a wide range of nanoring structures of varying diameter, spacing and height, resulting in various aspect-ratios. In contrast to fabrication based on lift-off, 19 The resonance wavelength of the magnetic LSPR depends on several parameters that permits us to tune the response over the whole NIR range. For instance, the resonance wavelength depends strongly on the refractive index of the underlying substrate, as noticed in previous works.…”

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confidence: 99%

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

et al. 2013

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Light-interaction at optical frequencies is mostly mediated by the electric component of the electromagnetic field, being the response to the magnetic component usually negligible.Recently, it has be shown that properly engineered metallic nanoparticles can provide a magnetic response at optical frequencies originated from real or virtual flows of electric current in the structure. In this work, we demonstrate a new plasmonic mode which emerges from the strong coupling of high-aspect ratio gold nanorings. The resonance changes its character from electric to magnetic when increasing the height of the nanorings, giving rise to magnetic plasmons. Numerical simulations show that a virtual current loop appears at resonance for

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Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

et al. 2013

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“…2,[6][7][8][9][10][11] Hollow nanostructures are even more sensitive than their solid analogues, as they have an extra degree of tunability afforded via control of the wall width. [12][13][14][15][16][17] The wall width of a hollow nanostructure determines how the inner and outer surface plasmons of a single nanoparticle interact with one another and how they interact with the plasmons on other nanoparticles within coupling range. 2, 6-11, 16, 17 It has been demonstrated that as two plasmonic particles are brought together, their near-fields begin to overlap and couple, which affects the plasmon resonance of the overall system.…”

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confidence: 99%

Hollow gold nanorectangles: The roles of polarization and substrate

Near

El‐Sayed

2013

The Journal of Chemical Physics

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Dimers of hollow gold nanorectangles ((197 ± 4) × (134 ± 6) nm outside and (109 ± 5) × (53 ± 3) nm inside) were fabricated via electron beam lithography with interparticle separations ranging from 27 ± 2 nm to 596 ± 8 nm. Spectroscopic investigation of these arrays showed multiple peaks under illumination polarized both parallel and perpendicular to the interparticle axis. Discrete dipole approximation theoretical calculations were used to investigate the nature of these multiple peaks. These calculations demonstrate that the multiple peaks arise due to a combination of multiple plasmon modes and interactions with the substrate. The substrate effects are more pronounced for the parallel polarization because parallel polarization (along the long axis) of the nanorectangles results in a much stronger dipole mode than for the perpendicular polarization (along the short axis). Next, we show how these peaks change, as the hollow nanorectangles are brought within coupling range of one another. In this endeavor, we make use of our previously reported method to directly convert scanning electron microscope images of the nanoparticles into the shape files for the theoretical calculations.

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“…In order to enhance the regularity, the hybrid droplets may often need to be treated with unipolar gas ions or the surface needs to be modified with additional functional materials to produce wider ranges for the charges on a hybrid droplet for use in optical nanodevices, such as near infrared (NIR)-surface-enhanced Raman scattering (SERS) 28,29 and NIR-surface plasmon resonance (SPR). [30][31][32][33] We further tested the surface-enhanced Raman scattering (SERS) and Fourier transform (FT)-NIR properties of nanoscale Ag dots and rings because those structures are suitable for such applications. There are many approaches reported in the literature for producing SERS-and NIR-active nanoscale metallic surfaces from the fact that their SERS or SPR can be controlled by changing size, shape, or composition of metallic structure, effectively allowing for the control of light on the nanoscale.…”

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An aerosol-based soft lithography to fabricate nanoscale silver dots and rings for spectroscopic applications

2015

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Site-selective deposition of aerosol Pd nanoparticles on a substrate was employed to fabricate nanoscale Ag dots and rings through a subsequent electroless deposition. The fabricated nanoscale dot and ring arrays respectively showed properties in surface-enhanced Raman (SER, with a 1.8 × 10(5) enhancement factor) and Fourier transform near infrared (FT-NIR, at 6153 cm(-1) absorption band) spectra.

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Pronounced Effects of Anisotropy on Plasmonic Properties of Nanorings Fabricated by Electron Beam Lithography

Cited by 111 publications

References 58 publications

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

Magnetic Hot Spots in Closely Spaced Thick Gold Nanorings

Hollow gold nanorectangles: The roles of polarization and substrate

An aerosol-based soft lithography to fabricate nanoscale silver dots and rings for spectroscopic applications

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