Tunable plasmon resonances in a metallic nanotip–film system

Uetsuki, Kazumasa; Verma, Prabhat; Nordlander, Peter; Kawata, Satoshi

doi:10.1039/c2nr31542d

Cited by 23 publications

(19 citation statements)

References 37 publications

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“…While not an exact match, there are features that can be evaluated to qualitatively assess the electric fields in this geometry. It is worth noting that parameters, such as roughness 38 and the thickness of the gold film 39 , are known to perturb the result. Nonetheless, the model provides a picture for interpreting the TERS result.…”

Section: Resultsmentioning

confidence: 99%

Experimental correlation of electric fields and Raman signals in SERS and TERS

et al. 2015

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Enhanced Raman scattering from plasmonic nanostructures associated with surface enhanced (SERS) and tip enhanced (TERS) is seeing a dramatic increase in applications from bioimaging to chemical catalysis. The importance of gap-modes for high sensitivity indicates plasmon coupling between nanostructures plays an important role. However, the observed Raman scattering can change with different geometric arrangements of nanoparticles, excitation wavelengths, and chemical environments; suggesting differences in the local electric field. Our results indicate that molecules adsorbed to the nanostructures are selectively enhanced in the presence of competing molecules. This selective enhancement arises from controlled interactions between nanostructures, such as an isolated nanoparticle and a TERS tip. Complementary experiments suggest that shifts in the vibrational frequency of reporter molecules can be correlated to the electric field. Here we present a strategy that utilizes the controlled formation of coupled plasmonic structures to experimentally measure both the magnitude of the electric fields and the observed Raman scattering.

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Section: Resultsmentioning

confidence: 99%

Experimental correlation of electric fields and Raman signals in SERS and TERS

et al. 2015

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“…By coupling the tip with a metal film or a metal nanoparticle on the film, nanogap can be controllably created. Tip-enhanced Raman spectroscopy (TERS) has been developed based on the hot-spots in the tip-substrate coupled structures [15,[60][61][62][63].…”

Section: Hot Spots For Surface-enhanced Raman Scattering (Sers)mentioning

confidence: 99%

Plasmonics in composite nanostructures

Wei

2014

Materials Today

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Plasmonics is a rapidly developing research field with many potential applications in fields ranging from bioscience, information processing and communication to quantum optics. It is based on the generation, manipulation and transfer of surface plasmons (SPs) that have the ability to manipulate light at the nanoscale. Realizing plasmonic applications requires understanding how the SP-based properties depend on the nanostructures and how these properties can be controlled. For that purpose composite nanostructures are particularly interesting because many novel and extraordinary properties unattainable in single nanostructures can be obtained by designing composite nanostructures with various materials. Here, we review recent advances in the studies of three classes of composite nanostructure that are important for plasmonics: metal-metal, metal-dielectric, and metalsemiconductor composite nanostructures.

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“…The resonant wavelength is red-shifted as the distance decreases. However, when the thickness of the substrate is thin enough, hybridized plasmon resonances occur due to interaction between the localized plasmon resonance of the tip and the delocalized SPPs of the thin substrate (Figure 7.16) [80]. The lower energy resonance is highly tunable, and decreases with reduced substrate thickness.…”

Section: Metallic Probe Tip: Design and Fabricationmentioning

confidence: 99%