Note: Simultaneous measurement of surface plasmon resonance and surface-enhanced Raman scattering

Liu, Yu; Xu, Shuping; Tang, Bin; Wang, Ye; Zhou, Ji; Zheng, Xianliang; Zhao, Bing; Xu, Weiqing

doi:10.1063/1.3321313

Cited by 43 publications

(62 citation statements)

References 41 publications

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“…To learn about the EM amplification of the WEF-LSP configuration we designed and compare it with the attenuated total reflection (ATR) or ATR-SPR configurations [27][28][29][30][31], local EM distributions simulated by FDTD software were carried out. We first considered the polarization dependence, because it determines the intensity of the LSPs around the NPs at the surface of the waveguide.…”

Section: A Physical Sketch Of Wef Configurationmentioning

confidence: 99%

“…The TE modes lie in 66.79°and 51.47°, while the TM modes appear at 43.11°and 61.63°. Figures 6(b) and 6(c) show the SERS spectra of 4-MPY achieved under two resonant modes, collected from the air side by a self-developed angle-dependent Raman microspectrometer (named SPR-SERS microspectrometer) [27]. Owing to the fact that the strong EM field is only located at the sides of the In contrast, the EM distributions in the waveguide layer and Ag NPs directly excited by the incident polarizations (2) of (e), (f) TE and (g), (h) TM from the air.…”

Section: Sers On Wef-lsp Configurationmentioning

confidence: 99%

“…4-MPY in ethanol solution (1.0 × 10 −3 mol∕L) was dropped on the fresh Ag nano-hemisphere array. After drying, SERS spectra of 4-MPY at different incident angles were measured from the air side on the self-built angle-resolved Raman microspectrometer [27]. Figure 7(f ) shows the waveguide modes, where three modes correspond to TE polarization and two modes correspond to TM polarization among the detection angular range.…”

Section: Sers On Wef-lsp Configurationmentioning

confidence: 99%

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Modulation of hot regions in waveguide-based evanescent-field-coupled localized surface plasmons for plasmon-enhanced spectroscopy

Wang¹,

Wang²,

Wang³

et al. 2017

Photon. Res.

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Coupling efficiency between the localized surface plasmons (LSPs) of metal nanoparticles (NPs) and incident light dominates the sensitivities of plasmon-based sensing spectroscopies and imaging techniques, e.g., surfaceenhanced Raman scattering (SERS) spectroscopy. Many endogenous features of metal NPs (e.g., size, shape, aggregation form, etc.) that have strong impacts on their LSPs have been discussed in detail in previous studies. Here, the polarization-tuned electromagnetic (EM) field that facilitates the LSP coupling is fully discussed. Numerical analyses on waveguide-based evanescent fields (WEFs) coupled with the LSPs of dispersed silver nanospheres and silver nano-hemispheres are presented and the applicability of the WEF-LSPs to plasmon-enhanced spectroscopy is discussed. Compared with LSPs under direct light excitation that only provide 3-4 times enhancement of the incidence field, the WEF-LSPs can amplify the electric field intensity about 30-90 times (equaling the enhancement factor of 10 6-10 8 in SERS intensity), which is comparable to the EM amplification of the SERS "hot spot" effect. Importantly, the strongest region of EM enhancement around silver nanospheres can be modulated from the gap region to the side surface simply by switching the incident polarization from TM to TE, which widely extends its sensing applications in surface analysis of monolayer of molecule and macromolecule detections. This technique provides us a unique way to achieve remarkable signal gains in many plasmon-enhanced spectroscopic systems in which LSPs are involved.

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Section: A Physical Sketch Of Wef Configurationmentioning

confidence: 99%

Section: Sers On Wef-lsp Configurationmentioning

confidence: 99%

Section: Sers On Wef-lsp Configurationmentioning

confidence: 99%

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Modulation of hot regions in waveguide-based evanescent-field-coupled localized surface plasmons for plasmon-enhanced spectroscopy

Wang¹,

Wang²,

Wang³

et al. 2017

Photon. Res.

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“…5,6 By means of surface enhanced Raman scattering (SERS) technology, Raman spectroscopy is also an ultrasensitive analysis tool. [7][8][9][10] In addition, the detection of Raman spectra requires very little sample and is not influenced by water. Based on these advantages Raman spectroscopy is thought to be a very suitable detection way for LOC technology.…”

mentioning

confidence: 99%

Note: Mobile micro-Raman analyzer integrated with a lab-on-a-chip

Chen

Zhang

et al. 2013

Review of Scientific Instruments

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A mobile micro-Raman microfluidic analyzer was designed and built for label-free, nondestructive, fingerprint detection of samples on microfluidic chip systems. It mainly includes an optical module (including the Raman detection system and the microscopic imaging system), 3-axis stages with step motors and other auxiliary circuits. The setup of the analyzer was designed with fully considering the characters of the microfluidics system. The experimental results prove that this microfluidics analyzer is practical and very convenient to use. This micro-Raman microfluidics analyzer with high performance to cost ratio has wide application potential in lab-on-a-chip fields as a powerful analytical tool.

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“…These two technologies also can con¯rm each other to exclude false-negative or false-positive cases exited in the experimental process. 24,25 Di®erent concentrations of Cy5 solutions are used to test the dark¯eld°uorescence excitation ability of this system. A He-Ne laser with a wavelength of 632.8nm and a power of 40 mW is employed as the light source for the su±cient excitation of°u orescence.…”

Section: Hyperspectral°uorescence Analysismentioning

confidence: 99%

A Biosensor Using Coupled Plasmon Waveguide Resonance Combined With Hyperspectral Fluorescence Analysis

Liu

Guo

et al. 2014

J. Innov. Opt. Health Sci.

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We developed a biosensor that is capable for simultaneous surface plasmon resonance (SPR) sensing and hyperspectral°uorescence analysis in this paper. A symmetrical metal-dielectric slab scheme is employed for the excitation of coupled plasmon waveguide resonance (CPWR) in the present work. Resonance between surface plasmon mode and the guided waveguide mode generates narrower full width half-maximum of the re°ective curves which leads to increased precision for the determination of refractive index over conventional SPR sensors. In addition, CPWR also o®ers longer surface propagation depths and higher surface electric¯eld strengths that enable the excitation of°uorescence with hyperspectral technique to maintain an appreciable signal-to-noise ratio. The refractive index information obtained from SPR sensing and the chemical properties obtained through hyperspectral°uorescence analysis con¯rm each other to exclude false-positive or false-negative cases. The sensor provides a comprehensive understanding of the biological events on the sensor chips.

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Note: Simultaneous measurement of surface plasmon resonance and surface-enhanced Raman scattering

Cited by 43 publications

References 41 publications

Modulation of hot regions in waveguide-based evanescent-field-coupled localized surface plasmons for plasmon-enhanced spectroscopy

Modulation of hot regions in waveguide-based evanescent-field-coupled localized surface plasmons for plasmon-enhanced spectroscopy

Note: Mobile micro-Raman analyzer integrated with a lab-on-a-chip

A Biosensor Using Coupled Plasmon Waveguide Resonance Combined With Hyperspectral Fluorescence Analysis

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