Enhancement of Raman scattering by field superposition of rough submicrometer silver particles

Zhang, Feng; Chen, Ping; Zhang, Lei; Mao, Song-Cheng; Lin, Lie; Tang, Yuguo; Cui, Jia; Qi, Xiangdong; Yang, Jinglei; Ma, Yunfeng

doi:10.1063/1.4705083

Cited by 11 publications

(12 citation statements)

References 24 publications

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“…In such conditions, the field superposition between surface structures and the core of the silver particle plays a major role in enhancement of the surface local field, instead of the interaction between surface structures. The surface local field near the polar region will be further localized by the surface structures, which leads to the local field enhancement [20]. Taking into account the above results, it is precisely because of this field superposition between surface structures and the core of the silver particle that a stronger surface local field is displayed.…”

Section: Resultsmentioning

confidence: 84%

Further localization of optical field for flower-like silver particles under laser radiation

Zhang

Chen

et al. 2013

Laser Phys. Lett.

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We find the surface optical field of submicron silver particles can be further localized by their surface roughening, which leads to a greatly enhanced local field. The flower-like silver particles were prepared and the extinction spectra were measured in our work. A high enhancement factor of 1.3 × 10 7 was obtained by surface-enhanced Raman spectrum. Besides that, the correlation between the surface plasmon resonance mode and surface local field was also studied by theoretical analysis. The results show the plasmon resonance modes of flower-like silver particles include dipole and multipole plasmon resonances. For the dipole plasmon resonance at long wavelength, the local field near polar regions will be further localized as a result of the rough surface. In contrast, the interaction of local field between surface structures will cause hotspots for the multipole plasmon resonance in the short-wave region. Based on these factors, we demonstrate that the rough-surface-induced field superposition results in the redistribution and enhancement of the optical field around the particles.

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Section: Resultsmentioning

confidence: 84%

Further localization of optical field for flower-like silver particles under laser radiation

Zhang

Chen

et al. 2013

Laser Phys. Lett.

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“…In contrast, the PLD coating formed metal structures with a more complex morphology that shows sharp edges, spikes, and overall porosity. Such diversified morphology of plasmonic metals (shape and distance between particles) is known to introduce more hot spots on substrates used for SERS [ 42 – 44 ]. Therefore, it can be the reason for one order of magnitude higher EFs on SERS substrates fabricated using PLD.…”

Section: Resultsmentioning

confidence: 99%

SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms

Zając¹,

Budner²,

Liszewska³

et al. 2023

Beilstein J. Nanotechnol.

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The results of comparative studies on the fabrication and characterization of GaN/Ag substrates using pulsed laser deposition (PLD) and magnetron sputtering (MS) and their evaluation as potential substrates for surface-enhanced Raman spectroscopy (SERS) are reported. Ag layers of comparable thicknesses were deposited using PLD and MS on nanostructured GaN platforms. All fabricated SERS substrates were examined regarding their optical properties using UV–vis spectroscopy and regarding their morphology using scanning electron microscopy. SERS properties of the fabricated GaN/Ag substrates were evaluated by measuring SERS spectra of 4-mercaptobenzoic acid molecules adsorbed on them. For all PLD-made GaN/Ag substrates, the estimated enhancement factors were higher than for MS-made substrates with a comparable thickness of the Ag layer. In the best case, the PLD-made GaN/Ag substrate exhibited an approximately 4.4 times higher enhancement factor than the best MS-made substrate.

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“…In our study the layer of Ag:Au alloy was sputtered on the polymer fibers via the PVD method. The Ag:Au alloy ensured the combination of very high enhancement of the Raman signal provided by Ag with the chemical stability offered by Au [43]. In order to create a platform that provided optimal enhancement of the Raman signal, three different thicknesses of Ag:Au alloys (20, 40, and 80 nm) were tested.…”

Section: Resultsmentioning

confidence: 99%

Detection of Circulating Tumor Cells Using Membrane-Based SERS Platform: A New Diagnostic Approach for ‘Liquid Biopsy’

et al. 2019

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The detection and monitoring of circulating tumor cells (CTCs) in blood is an important strategy for early cancer evidence, analysis, monitoring of therapeutic response, and optimization of cancer therapy treatments. In this work, tailor-made membranes (MBSP) for surface-enhanced Raman spectroscopy (SERS)-based analysis, which permitted the separation and enrichment of CTCs from blood samples, were developed. A thin layer of SERS-active metals deposited on polymer mat enhanced the Raman signals of CTCs and provided further insight into CTCs molecular and biochemical composition. The SERS spectra of all studied cells—prostate cancer (PC3), cervical carcinoma (HeLa), and leucocytes as an example of healthy (normal) cell—revealed significant differences in both the band positions and/or their relative intensities. The multivariate statistical technique based on principal component analysis (PCA) was applied to identify the most significant differences (marker bands) in SERS data among the analyzed cells and to perform quantitative analysis of SERS data. Based on a developed PCA algorithm, the studied cell types were classified with an accuracy of 95% in 2D PCA to 98% in 3D PCA. These results clearly indicate the diagnostic efficiency for the discrimination between cancer and normal cells. In our approach, we exploited the one-step technology that exceeds most of the multi-stage CTCs analysis methods used and enables simultaneous filtration, enrichment, and identification of the tumor cells from blood specimens.

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Enhancement of Raman scattering by field superposition of rough submicrometer silver particles

Cited by 11 publications

References 24 publications

Further localization of optical field for flower-like silver particles under laser radiation

Further localization of optical field for flower-like silver particles under laser radiation

SERS performance of GaN/Ag substrates fabricated by Ag coating of GaN platforms

Detection of Circulating Tumor Cells Using Membrane-Based SERS Platform: A New Diagnostic Approach for ‘Liquid Biopsy’

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