Examining metal nanoparticle surface chemistry using hollow-core, photonic-crystal, fiber-assisted SERS

Eftekhari, F.; Lee, Anna; Kumacheva, Eugenia; Helmy, Amr S.

doi:10.1364/ol.37.000680

Cited by 21 publications

(13 citation statements)

References 22 publications

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“…Importantly, this broadband light trapping metasurface structure is completely lithography free, suitable for future large area roll-to-roll deposition processes for inexpensive nanomanufacturing. In addition to providing new understanding of broadband light trapping and field localization, this work may open avenues toward new applications in energy harvesting 20, 54–56 , conversion 57–60 and surface enhanced Raman spectroscopy 61–63 .…”

Section: Resultsmentioning

confidence: 99%

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Zhang

Cheney

et al. 2017

Sci Rep

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Broadband light trapping and field localization is highly desired in enhanced light-matter interaction, especially in harmonic generations. However, due to the limited resonant bandwidth, most periodic plasmonic nanostructures cannot cover both fundamental excitation wavelength and harmonic generation wavelength simultaneously. Therefore, most previously reported plasmonic nonlinear optical processes are low in conversion efficiency. Here, we report a strong enhancement of second harmonic generation based on a three-layered super absorbing metasurface structure consisting of a dielectric spacer layer sandwiched by an array of random metallic nanoantennas and a metal ground plate. Intriguingly, the strong light trapping band (e.g. >80%) was realized throughout the entire visible to near-infrared spectral regime (i.e., from 435 nm to 1100 nm), enabling plasmonically enhanced surface harmonic generation and frequency mixing across a broad range of excitation wavelengths, which cannot be achieved with narrow band periodic plasmonic structures. By introducing hybrid random antenna arrays with small metallic nanoparticles and ultra-thin nonlinear optical films (e.g. TiO2) into the nanogaps, the nonlinear optical process can be further enhanced. This broadband light-trapping metastructure shows its potential as a building block for emerging nonlinear optical meta-atoms.

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Section: Resultsmentioning

confidence: 99%

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Zhang

Cheney

et al. 2017

Sci Rep

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“…Various types of fiber-based SERS probes have been developed over the past few years, such as the D-type fiber probe [12]; photonic-crystal fiber-based SERS probe [13]- [15]; tapered multimode fiber probe [16], [17]; and femtosecond (fs) laser ablated fiber probe [18], [19]. In those reported results, SERS could be generated either by evanescent field of the propagating light in the silica core [12], [13], [16], [17] or by direct core mode field excitation of the propagating light in the liquid core [14] and the end surface of silica core [18], [19] according to the Raman signal excited way, while the endface core mode field excitation is a popular way for its larger overlap of excited light field and metal nanoparticles. Meanwhile, the SERS signal could be collected by forward scattering configuration or back scattering configuration, while the latter one is a promising way for remote, in situ and in vivo sensing applications.…”

Section: Introductionmentioning

confidence: 94%

Sensitivity-Enhanced U-Shaped Fiber SERS Probe With Photoreduced Silver Nanoparticles

Yin

Geng

et al. 2016

IEEE Photonics J.

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This paper presents a novel U-shaped fiber surface-enhanced Raman scattering (SERS) spectra probe with high-performance remote sensing based on femtosecond laser ablation and deposition of photoreduced silver nanoparticles. As the width of the U-shaped structure is around 12 m, the sensitivity is enhanced about four times more than that of a single-endface-based fiber SERS probe. The experiment results show that there is a nonlinear relationship between the SERS signal and the width of the U-shaped structure, whereas the SERS signal is sharply decreased with the increasing width of the U-shape. Our U-shaped fiber SERS probe shows a feasible method for high-performance, real-time, and remote measurement of the SERS signal in biochemical analysis.

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“…A simpler alternative approach consists on filling the HC‐PCF air cavities with a mixed solution of target analyte and SERS‐active NPs (mainly Au or Ag NPs) . SERS probes realized by introducing the mixed solution within both the core and cladding channels (liquid filled HC‐PCF probes) or within the core only (liquid‐core PCFs ‐ LC‐PCFs‐ probes) have been demonstrated in the past, the latter solution being able to provide smaller LODs (up to two orders of magnitude) due to a larger interaction volume of light in the core with the target analyte .…”

Section: Lab In Fibermentioning

confidence: 99%

Lab on Fiber Technology for biological sensing applications

Vaiano

Carotenuto

Pisco

et al. 2016

Laser & Photonics Reviews

226

155

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This review presents an overview of “Lab on Fiber” technologies and devices with special focus on the design and development of advanced fiber optic nanoprobes for biological applications. Depending on the specific location where functional materials at micro and nanoscale are integrated, “Lab on Fiber Technology” is classified into three main paradigms: Lab on Tip (where functional materials are integrated onto the optical fiber tip), Lab around Fiber (where functional materials are integrated on the outer surface of optical fibers), and Lab in Fiber (where functional materials are integrated within the holey structure of specialty optical fibers). This work reviews the strategies, the main achievements and related devices developed in the “Lab on Fiber” roadmap, discussing perspectives and challenges that lie ahead, with special focus on biological sensing applications.

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Examining metal nanoparticle surface chemistry using hollow-core, photonic-crystal, fiber-assisted SERS

Cited by 21 publications

References 22 publications

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Sensitivity-Enhanced U-Shaped Fiber SERS Probe With Photoreduced Silver Nanoparticles

Lab on Fiber Technology for biological sensing applications

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