Surface-plasmon enhancement of Brillouin light scattering from gold-nanodisk arrays on glass

Utegulov, Zhandos; Shaw, Justin M.; Draine, B. T.; Kim, S. A.; Johnson, Ward L.

doi:10.1117/12.735253

Cited by 14 publications

(17 citation statements)

References 31 publications

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“…The discontinuity in |E| 2 at the boundary is spread out over a distance ∼ d. The DDA obviously cannot reproduce field structure near the target surface on scales smaller than the dipole separation d, but fields on scales larger than d appear to be quite accurate. DDSCAT and DDfield should be useful tools for studying electromagnetic fields around arrays of nanostructures, such as gold nanodisks [17,18].…”

Section: Near-field Evaluationmentioning

confidence: 99%

Discrete-dipole approximation for periodic targets: theory and tests

2008

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The discrete-dipole approximation (DDA) is a powerful method for calculating absorption and scattering by targets that have sizes smaller than or comparable to the wavelength of the incident radiation. The DDA can be extended to targets that are singly or doubly periodic. We generalize the scattering amplitude matrix and the 4 x 4 Mueller matrix to describe scattering by singly and doubly periodic targets and show how these matrices can be calculated using the DDA. The accuracy of DDA calculations using the open-source code DDSCAT is demonstrated by comparison with exact results for infinite cylinders and infinite slabs. A method for using the DDA solution to obtain fields within and near the target is presented, with results shown for infinite slabs.

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Section: Near-field Evaluationmentioning

confidence: 99%

Discrete-dipole approximation for periodic targets: theory and tests

2008

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“…The electrical field distribution was analyzed by Utegulov et al [29] using the discrete dipole approximation algorithm. However, the physics related to the observed phenomena remains largely unknown.…”

Section: Discussionmentioning

confidence: 99%

“…The enhancement factor for Raman signal can reach 10 11 , which enables single-molecule-level detection. Previous studies indicated that surface acoustic wave is observable in the interface between gold nano-structures and its substrate [29]. However, its signal enhancement in the surrounding medium has not been thoroughly studied.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we utilized a similar gold nanodisk array (alkaline-earth boro-aluminosilicate glass coated with periodic arrays of gold nanodisks [29]) and observed the Brillouin scattering signal with and without the presence of the nano-structures. The signal enhancements were observed for the bulk phonons within various liquids (including DMSO and water) in the vicinity of gold nanodisks.…”

Section: Introductionmentioning

confidence: 99%

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Surface-enhanced Brillouin scattering in a vicinity of plasmonic gold nanostructures

2015

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Brillouin spectroscopy is a powerful tool for non-invasive elasticity-specific optical imaging. We report an observation of enhancements of Brillouin scattering from liquid samples in the presence of gold nanostructures. These enhancements are attributed to surface plasmons generated by nanostructures and are found to be dependent on the nanostructures' architecture (i.e. their sizes and aspect ratios). These observations suggest that plasmonic nanostructures composed of nanodisk arrays can provide a platform for practical implementation of surfaceenhanced Brillouin scattering, which is capable of localizing interaction to a nanoscopic volume to facilitate high spatial resolution elasticity measurements. KEYWORDSSpontaneous Brillouin scattering, Brillouin spectroscopy, surface enhanced Brillouin scattering, virtually imaged phased array (VIPA)

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“…The restriction of a narrow range of phonon wavevectors can be relaxed, and the need for a Kretschmann prism can be eliminated, by employing a periodically corrugated noble-metal film for plasmon mediation. 11,12 In a previous report, 13 we suggested that periodic arrays of noble-metal nanodisks or nanolines may provide a more flexible platform than the Kretschmann geometry or corrugated noblemetal films for SEBS, enabling measurements over a wider range of incident angles. Our measurements on gold-nanodisk arrays on glass provided evidence for modest enhancement (factors of 2-6) of phonon spectra from this structure over a relatively broad range of angles.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Arrays of Gold Nanodisks for Plasmon-Mediated Brillouin Light Scattering

et al. 2009

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Distributions of electric fields in two-dimensional arrays of gold nanodisks on a Si 3 N 4 membrane, with light incident through the membrane, are modeled with the aim of determining array geometries for effective plasmon-mediated Brillouin light scattering ("surface-enhanced Brillouin scattering") from phonons or magnons in a specimen placed in contact with such an array. Particular attention is devoted to average intensities and higher-wavevector components of the fields in a plane 2 nm from the circular nanodisk/vacuum interface, which is anticipated to be in the vicinity of the surface of a specimen. For nanodisks with diameters of 50 nm, the average intensity near the circular nanodisk/vacuum interface increases as the angle of the incident light approaches the normal of the Si 3 N 4 surface. At low angles of incidence relative to the Si 3 N 4 normal, average intensities also increase with decreasing array spacing, primarily because of the corresponding changes in fractional coverage area of the gold. The highest average intensities (with near-normal incidence and 70 nm array periodicity) are found to be ∼3 times that of the incident light. More significantly, higher-wavevector components of the fields are found to have intensities comparable to the incident light. This finding provides evidence for the feasibility of using surface plasmons in nanodisk or nanoline arrays to mediate Brillouin scattering from phonons or magnons with wavelengths of a few tens of nanometers, which would extend the wavevector range of Brillouin-scattering metrology by an order of magnitude.

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Surface-plasmon enhancement of Brillouin light scattering from gold-nanodisk arrays on glass

Cited by 14 publications

References 31 publications

Discrete-dipole approximation for periodic targets: theory and tests

Discrete-dipole approximation for periodic targets: theory and tests

Surface-enhanced Brillouin scattering in a vicinity of plasmonic gold nanostructures

Optimization of Arrays of Gold Nanodisks for Plasmon-Mediated Brillouin Light Scattering

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