Surface‐Enhanced Raman Scattering Imaging: Application and Experimental Approach by Far‐Field with Conventional Setup

Kitahama, Yasutaka; Hossain, Mohammad Kamal; Ozaki, Yukihiro; Itoh, Tamitake; Sujith, A.; Han, Xiaoxia

doi:10.1002/9780470768150.ch15

Cited by 3 publications

(9 citation statements)

References 81 publications

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“…32 However, many-particle aggregates or colloid-based nanostructures are reported to provide isotropic and inhomogeneous SPRs mediated EM field localization. 1,33,34 Furthermore, a broad SPR excitation peak, which is considerably different from the individual narrow excitations of isolated hotsites has been observed. 5,16,32,35 Hence, limited-particle aggregates or nanostructures with a unique assembly are essential and indispensable to understand SERS enhancement as well as polarization-dependent and polarization-selective SERS characteristics.…”

Section: Introductionmentioning

confidence: 94%

“…Surface-enhanced Raman scattering (SERS) has become a center of interest in recent science and technology. [1][2][3][4][5][6][7] SERS is not only simple with single molecule detection capability but also inherits the fine molecular specificity from the Raman effect of the analyte of interest. 1,4,[8][9][10][11][12][13][14][15][16][17][18] Because SERS demands the presence of a metallic nanostructure, the phenomenon results not only from light-molecule interactions but also from light-metal interactions.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7] SERS is not only simple with single molecule detection capability but also inherits the fine molecular specificity from the Raman effect of the analyte of interest. 1,4,[8][9][10][11][12][13][14][15][16][17][18] Because SERS demands the presence of a metallic nanostructure, the phenomenon results not only from light-molecule interactions but also from light-metal interactions. 3,5,8,11,14 The main causative factor of significant SERS enhancements is now known: ''The analyte'' must be at ''the hotsite,'' which is the region of strong and localized electromagnetic (EM) field modulated by the analyte through its absorption and orientation.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic gold nanoassembly: a study on polarization-dependent and polarization-selective surface-enhanced Raman scattering

Hossain

Huang

Tanaka

et al. 2015

Phys. Chem. Chem. Phys.

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A simple one-step process was adopted to fabricate anisotropic gold nanoassemblies. Evaporation-assisted nanoparticle assembly at the meniscus was maintained in this regard. Scanning electron microscopy confirmed that the constituent nanoparticles of the anisotropic gold nanoassembly are neither in physical contact nor agglomerated; instead, they are separated by a small interparticle gap. Crystal violet was adsorbed on the anisotropic gold nanoassembly, and a large enhancement (several orders of magnitude) in surface-enhanced Raman scattering (SERS) was observed. The assembly was thus proved to be highly SERS-active. Such an anisotropic gold nanoassembly allowed polarization dependent and polarization selective SERS experiments to be carried out. Inhomogeneous SERS and surface plasmon resonance distribution were observed along the assembly. Polarization-dependent SERS enhancement reached its highest value at in-plane polarization to the long axis, whereas polarization-selective SERS characteristics at the same spatial position showed uniform enhancement. Fluorescence emission accompanied with SERS signals was also characterized. Polarization-dependent fluorescence was enhanced at in-plane polarization to the long axis, whereas polarization-selective fluorescence was not enhanced. The experimental results were correlated and explained with three-dimensional finite definite time domain simulations as well. Such interstitial-limited gold nanoassembly provides means to realize polarized SERS characteristics for ensemble SERS measurements, which are important not only for the application-oriented fabrication of SERS-active substrates but also for understanding their feasibility in those applications.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic gold nanoassembly: a study on polarization-dependent and polarization-selective surface-enhanced Raman scattering

Hossain

Huang

Tanaka

et al. 2015

Phys. Chem. Chem. Phys.

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“…In contrast, no SERS emerges from the molecule on the rest of the surface of the Ag nanoaggregate ( Figure 6.7c). SERS light is emitted from the molecule trapped at a junction of an Ag nanoaggregate where the EM field is greatly enhanced ( Figure 6.7d) [1][2][3][4][5][6]. Because, the mechanism for bright SERS events is similar to that of dark fluorescence events in a single QD, the probability distributions of the blinking SERS contrast those of the blinking fluorescence from a single QD [17,18].…”

Section: Power Law Analysismentioning

confidence: 99%

“…It is noted that the truncation times are independent of LSPR wavelength for each of the SERS-active Ag nanoaggregates. There is the possibility that the photo-thermal conversion due to LSPR causes the short truncation times via fast diffusion of adsorbed molecules (see Equation 6.4) by increase in the local temperature. However, the possibility is not confirmed by this result.…”

Section: Power Law Exponents For the Bright And Dark Eventsmentioning

confidence: 99%

Analysis of Blinking SERS by a Power Law with an Exponential Function

Kitahama

Ozaki

2014

Frontiers of Surface‐Enhanced Raman Scattering

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Surface-Enhanced Phosphorescence Measurement by an Optically Trapped Colloidal Ag Nanoaggregate on Anionic Thiacarbocyanine H-Aggregate

et al. 2012

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A citrate-reduced Ag nanoaggregate was optically trapped on a fibershaped H-aggregate of an anionic thiacarbocyanine dye against Coulomb repulsion by focusing a near-infrared (NIR) laser beam. As the NIR laser power increased, namely, as the Ag nanoaggregate approaches the H-aggregate, phosphorescence from the H-aggregate with the Ag nanoaggregate excited moderately at 514 and 647 nm was strengthened, although that at 568 nm was weakened. By excitation at 568 nm, which was close to a surface plasmon resonance peak of the Ag nanoaggregate, surface-plasmon-enhanced optical trapping potential well might have deepened, and then the Ag nanoaggregate might have approached the H-aggregate too closely to enhance the phosphorescence because of energy transfer to the metal. As the excitation laser intensity increased, namely, as the surface-plasmon-enhanced optical trapping potential well was deepened, the phosphorescence enhancement factor trended upward and then downward by enhancement due to plasmon at a close distance from the Ag surface and the energy transfer at the closer distance, respectively.

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Surface‐Enhanced Raman Scattering Imaging: Application and Experimental Approach by Far‐Field with Conventional Setup

Cited by 3 publications

References 81 publications

Anisotropic gold nanoassembly: a study on polarization-dependent and polarization-selective surface-enhanced Raman scattering

Anisotropic gold nanoassembly: a study on polarization-dependent and polarization-selective surface-enhanced Raman scattering

Analysis of Blinking SERS by a Power Law with an Exponential Function

Surface-Enhanced Phosphorescence Measurement by an Optically Trapped Colloidal Ag Nanoaggregate on Anionic Thiacarbocyanine H-Aggregate

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