Molecular plasmonics for nanoscale spectroscopy

Sonntag, Matthew D.; Klingsporn, Jordan M.; Zrimsek, Alyssa B.; Sharma, Bhavya; Ruvuna, Laura K.; Duyne, Richard P. Van

doi:10.1039/c3cs60187k

Cited by 186 publications

(131 citation statements)

References 153 publications

(206 reference statements)

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“…4 SERS substrates can be divided into two groups, (i) colloid metal nanoparticles 5 and (ii) roughened metallic surfaces. 6 The main limitation in using colloid metal nanoparticles is the tendency for nanoparticle conglomeration after the addition of the analyte which often leads to poor reproducibility of the SERS spectra.…”

Section: Introductionmentioning

confidence: 99%

Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies

Castillo¹,

Rozo²,

Bertel³

et al. 2015

Journal of the Brazilian Chemical Society

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The orientation of pterin-6-carboxylic acid on gold nanopillars was investigated by surface enhanced Raman spectroscopy and density functional theory methods. The experimentally vibrations from pterin-6-COOH free and attached to the Au surface display vibration features indicating chemical interaction of the pterin with the metal surface. The spectral feature evidenced that the pterin would adsorb on gold surface with a "lying down" configuration through the high intensity vibration of NH scissoring and rocking OH modes. The orientation study of pterins on gold nanopillars presented herein is believed to lead to new applications in biosensing field for detecting pterins of physiological importance.

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Section: Introductionmentioning

confidence: 99%

Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies

Castillo¹,

Rozo²,

Bertel³

et al. 2015

Journal of the Brazilian Chemical Society

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“…In addition to its simplicity and green chemistry, the contents of AgNPs on nanofabric mats can be easily tuned by the exposure of post-ultraviolet (UV) irradiation or the preheating treatment ( Figure 1). Moreover, since PVA has been reported as an effective stabilizer of AgNPs, by preventing them from aggregation, 27 this approach opens an alternative possibility of creating dispersed and aligned nanostructures of AgNPs in PVA nanofiber matrix for wide applications such as biological sensors, [28][29][30] conductive interconnects, 31,32 optoelectronic devices, [33][34][35] and effective bioactive materials, as we demonstrate to follow.…”

mentioning

confidence: 99%

Facile and green fabrication of electrospun poly(vinyl alcohol) nanofibrous mats doped with narrowly dispersed silver nanoparticles

Lin¹,

Wang²,

Wang³

et al. 2014

IJN

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Submicrometer-scale poly(vinyl alcohol) (PVA) nanofibrous mats loaded with aligned and narrowly dispersed silver nanoparticles (AgNPs) are obtained via the electrospinning process from pure water. This facile and green procedure did not need any other chemicals or organic solvents. The doped AgNPs are narrowly distributed, 4.3±0.7 nm and their contents on the nanofabric mats can be easily tuned via in situ ultraviolet light irradiation or under preheating conditions, but with different particle sizes and size distributions. The morphology, loading concentrations, and dispersities of AgNPs embedded within PVA nanofiber mats are characterized by transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, ultraviolet-visible spectra, X-ray photoelectron spectroscopy, and X-ray diffraction, respectively. Moreover, the biocidal activities and cytotoxicity of the electrospun nanofiber mats are determined by zone of inhibition, dynamic shaking method, and cell counting kit (CCK)-8 assay tests.

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“…This allows for an additional miniaturization which cannot take place in a near-perfect conductor and is the source of some of the most striking plasmonic applications, such as emitters engineering [7], surface-enhanced spectroscopy and molecular sensing [8,9] or photothermal therapy [10], where optical antennae serve as an interface between the wavelength of light and the size of molecules. However, as the size-mismatch increases between the wavelength and the antenna size, the efficiency of the latter decreases in proportion; it results in smaller components but at the cost of additional dissipation.…”

Section: Introductionmentioning

confidence: 99%

General considerations for the miniaturization of radiative antennae

Francescato¹,

Yang²,

Huang³

et al. 2015

Opt. Express

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The small size of plasmonic nanostructures compared to the wavelength of light is one of their most distinct and defining characteristics. It results in the strong compression of an incident wave to intense hot spots which have been used most remarkably for molecular sensing and nanoscale lasers. But another important direction for research is to use this ability to design miniaturized interconnects and modulators between fast, loss-less photonic components. In this situation one is looking for the smallest optical nanostructure possible while trying to mitigate losses. Here we show that despite their high absorption, conductors are still the best materials to reach the sub-wavelength regime for optical antennae when compared to polar crystals and high-index dielectrics, two classes of material which have shown a lot of potential recently for nanophotonic applications. It is demonstrated through both Mie theory and numerical calculations that the smallest possible, efficient, radiating antenna has a length L > λ res /20 in all cases (this length is typically L = λ res /2 in microwave engineering), including the redshifting mechanism induced by a background or substrate refractive index, the effect of material loss and that of shape. In addition, we show that although the assembly of individual particles can further increase the miniaturization factor, it strongly increases the size-mismatch in detriment of the overall efficiency, thus making this method unfit for radiating antennae. By identifying the relevant dimensionless properties for conductors, polar materials and high index dielectrics, we present an unified understanding of the behaviour of sub-wavelength nanostructures which are at the heart of current nanophotonic research and cast the upper achievable limits for optical antennae crucial to the development of real-life implementation. References and links1. E. Ozbay, "Plasmonics: Merging photonics and electronics at nanoscale dimensions," Science 311, 189-193 (2006). 2. W. L. Barnes, A. Dereux, and T. W. Ebbesen, "Surface plasmon subwavelength optics," Nature 424, 824-830 (2003). 3. A. Alù and N. Engheta, "Wireless at the nanoscale: Optical interconnects using matched nanoantennas," Phys.Rev. Lett. 104, 213902 (2010).

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Molecular plasmonics for nanoscale spectroscopy

Cited by 186 publications

References 153 publications

Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies

Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies

Facile and green fabrication of electrospun poly(vinyl alcohol) nanofibrous mats doped with narrowly dispersed silver nanoparticles

General considerations for the miniaturization of radiative antennae

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