Plasmonic Nanogalaxies: Multiscale Aperiodic Arrays for Surface-Enhanced Raman Sensing

Gopinath, Ashwin; Boriskina, Svetlana V.; Premasiri, W. Ranjith; Ziegler, L. D.; Reinhard, Björn M.; Negro, Luca Dal

doi:10.1021/nl902134r

Cited by 198 publications

(187 citation statements)

References 45 publications

(118 reference statements)

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“…Experimentally, Reinhard and Kneipp have been directing their efforts toward such systems. 36,40 Reinhard and his co-workers, using electron beam lithography, have created what they call nanocluster arrays, and having "satellite" on larger sphere is particularly effective. 36 Kneipp et al have been working with preformed particles which are induced to aggregate by controlling ionic strength.…”

Section: Resultsmentioning

confidence: 99%

“…Such results are in accord with the knowledge that interactions among particles are critical for effective surface enhancement, and in recent years, multi-scale systems composed of particles of varying sizes have been reported as particularly effective. 35,36 The random MFON system consisting of nanospheres of different diameters would be a good way to demonstrate and exploit the efficacy of multi-scale systems.…”

Section: Introductionmentioning

confidence: 99%

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Morphology Effects of Cap-shaped Silver Nanoparticle Films as a SERS Platform

Okamoto

2016

ANAL. SCI.

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In this paper, we evaluate randomly adsorbed cap-shaped silver nanoparticles for applications to surface-enhanced Raman spectroscopy, SERS. They were prepared by depositing silver on top of surface-adsorbed monodisperse SiO2 nanospheres, in a manner similar to the method for preparing metal film on nanosphere, MFON, but one major difference lies in the fact that nanospheres are randomly adsorbed rather than as a close-packed MFON. With random MFON, it is possible to incorporate nanospheres with more than one size. Mixing has been found to increase SERS performance. More specifically, by using 50 and 100 nm nanospheres, we found that substrates containing both types outperform substrates prepared from 100% of either 50 or 100 nm nanospheres. As evaluated by spectrophotometry, this increase could not be attributed to an increase in the extinction coefficient of the substrate at the irradiation wavelength of SERS measurements.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Morphology Effects of Cap-shaped Silver Nanoparticle Films as a SERS Platform

Okamoto

2016

ANAL. SCI.

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“…19,20 In particular, these latter results indicated the possibility of exciting broad resonances with enhanced spatial localization, higher density of the enhanced field states, and distinctive scattering fingerprints.…”

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confidence: 85%

Evidence of guided resonances in photonic quasicrystal slabs

Ricciardi¹,

Pisco²,

Cutolo³

et al. 2011

Phys. Rev. B

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We report on the experimental evidence of Fano-type guided resonances (GRs) in aperiodically-ordered photonic quasicrystal slabs. With specific reference to the Ammann-Beenker (8-fold symmetric, quasiperiodic) octagonal tiling geometry, we present our experimental results on silicon-on-insulator devices operating at near-infrared wavelengths, and compare them with the full-wave numerical predictions based on periodic approximants. Our results indicate that spatial periodicity is not strictly required for the GR excitation, and may be effectively surrogated by weaker forms of long-range aperiodic order which intrinsically provide extra degrees of freedom (e.g., higher-order rotational symmetries, richer defect states and phase-matching conditions, etc.) to be exploited in the design and performance optimization of nanostructured dielectric slabs operating in the out-of-plane configuration. The essential spectral features may be qualitatively understood in terms of phase-matching conditions derived from approximate homogenized models, and turn out to be effectively captured by full-wave modeling based on suitably-sized periodic approximants. The discovery, in 1984, of "quasicrystals" in solid-state physics 1,2 has triggered a growing interest in the study of aperiodically-ordered structures (based, e.g., on aperiodic tilings 3 ) in many branches of physics and engineering. 4 In particular, photonic quasicrystals (PQCs) have been widely investigated, [5][6][7] with the main focus on in-plane electromagnetic (EM) propagation effects in two-dimensional structures constituted of aperiodically-ordered arrangements of cylindrical inclusions (or holes) in a host medium. In this framework, certain effects observable in periodic photonic crystals (PCs), such as band gap, field localization, negative refraction and super-focusing, directive emission, etc., have been reproduced numerically and experimentally (see, e.g., Refs. 5-7 and references therein). The related studies provided useful insights in the influence of higher-order rotational symmetries, Bragg-type and multiple scattering, and shortrange interactions.8 Moreover, they also envisaged some potential advantages inherently tied to aperiodic order, such as easier achievement of phase-matching conditions, 9 higher isotropy and tradeoff between (lower) dielectric contrast and (higher) rotational symmetry, 10 richer and more wavelengthselective defect states, 11 field-localization capabilities even in the absence of lattice defects, 12 etc. In this framework, novel design strategies especially tailored to exploit the peculiar aspects and further degrees of freedom inherent of aperiodic order have been developed (see, e.g., Refs. 13 and 14).Much less attention has been devoted to out-of-plane propagation effects, with the notable exceptions of arrays of subwavelength holes in metallic films, [15][16][17][18] and arrays of metallic nanoparticles. 19,20 In particular, these latter results indicated the possibility of exciting broad resonances with enhanced spatial locali...

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“…A growing number of promising results on SERS active substrates prepared using lithographyderived processing have been reported more recently [18,[47][48][49][50][51][52][53][54][55][56][57][58].…”

Section: Sers Substrates Created Using Deterministicmentioning

confidence: 99%

“…The former two strategies can be referred to as a "bottom-up" approach, while lithographic patterning is a typical "top-down" approach. Since each of these strategies has its own advantages and limitations, a notable recent trend in creating SERS substrates with improved performance consists in combining top-down and bottom-up technological strategies [18].…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Scattering as an Emerging Characterization and Detection Technique

Çulha

Cullum

Lavrik

et al. 2012

Journal of Nanotechnology

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While surface-enhanced Raman spectroscopy (SERS) has been attracting a continuously increasing interest of scientific community since its discovery, it has enjoyed a particularly rapid growth in the last decade. Most notable recent advances in SERS include novel technological approaches to SERS substrates and innovative applications of SERS in medicine and molecular biology. While a number of excellent reviews devoted to SERS appeared in the literature over the last two decades, we will focus this paper more specifically on several promising trends that have been highlighted less frequently. In particular, we will briefly overview strategies in designing and fabricating SERS substrates using deterministic patterning and then cover most recent biological applications of SERS.

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Plasmonic Nanogalaxies: Multiscale Aperiodic Arrays for Surface-Enhanced Raman Sensing

Cited by 198 publications

References 45 publications

Morphology Effects of Cap-shaped Silver Nanoparticle Films as a SERS Platform

Morphology Effects of Cap-shaped Silver Nanoparticle Films as a SERS Platform

Evidence of guided resonances in photonic quasicrystal slabs

Surface-Enhanced Raman Scattering as an Emerging Characterization and Detection Technique

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