Surface-Enhanced Resonance Raman Scattering (SERRS) Using Au Nanohole Arrays on Optical Fiber Tips

Andrade, Gustavo F. S.; Hayashi, Juliano G.; Rahman, Mohammad Mahbubur; Salcedo, Walter J.; Cordeiro, Cristiano M. B.; Brolo, Alexandre G.

doi:10.1007/s11468-013-9518-x

Cited by 39 publications

(28 citation statements)

References 41 publications

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“…Different Lab on Fiber based label free biosensors have been reported so far 22 23 24 . Moreover, LSPRs excited on the fiber tip could be exploited also for surface enhanced Raman spectroscopy (SERS) which involves the study of molecules adsorbed to the sensor surface 12 25 26 .…”

Section: Resultsmentioning

confidence: 99%

“…Although the FIB milling is especially useful for micro-structuring the optical fiber, so far only a few attempts of direct writing periodic nano-structures onto the fiber tip have been reported. For example, both circular and bow tie-shaped nanoholes arrays were fabricated on gold films deposited on the tips of single mode optical fibers 12 . Similarly, Dhawan et al reported the fabrication of nanopillars and nanoholes in optically thick metallic films.…”

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confidence: 99%

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Optical fiber tip templating using direct focused ion beam milling

Micco

Ricciardi

Pisco

et al. 2015

Sci Rep

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We report on a method for integrating sub-wavelength resonant structures on top of optical fiber tip. Our fabrication technique is based on direct milling of the glass on the fiber facet by means of focused ion beam. The patterned fiber tip acts as a structured template for successive depositions of any responsive or functional overlay. The proposed method is validated by depositing on the patterned fiber a high refractive index material layer, to obtain a ‘double-layer’ photonic crystal slab supporting guided resonances, appearing as peaks in the reflection spectrum. Morphological and optical characterizations are performed to investigate the effects of the fabrication process. Our results show how undesired effects, intrinsic to the fabrication procedure should be taken into account in order to guarantee a successful development of the device. Moreover, to demonstrate the flexibility of our approach and the possibility to engineering the resonances, a thin layer of gold is also deposited on the fiber tip, giving rise to a hybrid photonic-plasmonic structure with a complementary spectral response and different optical field distribution at the resonant wavelengths. Overall, this work represents a significant step forward the consolidation of Lab-on-Fiber Technology.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Optical fiber tip templating using direct focused ion beam milling

Micco

Ricciardi

Pisco

et al. 2015

Sci Rep

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“…16 Recently, plasmonic fiber-optic probes for SERS were fabricated on the top surface with precisely defined metallic nanostructures using nanolithographic methods. 17,18 Furthermore, the direct implementation of the nanostructures has been achieved on the fiber-top surface using oblique angle deposition 19 or subsequent thermal annealing. 20 However, a cost-effective nanofabrication of biocompatible Au nanostructures on fiber-top surfaces with quantitative analysis is still under development for utilizing plasmonic fiber-optic probe as an in vivo SERS sensor.…”

Section: Introductionmentioning

confidence: 99%

Fiber-optic plasmonic probe with nanogap-rich Au nanoislands for on-site surface-enhanced Raman spectroscopy using repeated solid-state dewetting

et al. 2019

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We report a fiber-optic plasmonic probe with nanogap-rich gold nanoislands for on-site surfaceenhanced Raman spectroscopy (SERS). The plasmonic probe features nanogap-rich Au nanoislands on the top surface of a single multimode fiber. Au nanoislands were monolithically fabricated using repeated solid-state dewetting of thermally evaporated Au thin film. The plasmonic probe shows 7.8 × 10 6 in SERS enhancement factor and 100 nM in limit-of-detection for crystal violet under both the excitation of laser light and the collection of SERS signals through the optical fiber. The fiber-through measurement also demonstrates the label-free SERS detection of folic acid at micromolar level. The plasmonic probe can provide a tool for on-site and in vivo SERS applications.

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“…Bouvrée et al used a multi-step process based upon e-beam lithography to create regular patterns (concentric rings or lines) on the optical fiber tip where gold nanoparticles are then immobilized [ 25 ]. Andrade et al designed and fabricated SERS surfaces composed of both circular and bow tie-shaped gold nanohole arrays by using the direct FIB milling of a gold layer deposited on the single mode fiber tip [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Nanosphere Lithography on Fiber: Towards Engineered Lab-On-Fiber SERS Optrodes

Quero

Zito

Managò

et al. 2018

Sensors

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In this paper we report on the engineering of repeatable surface enhanced Raman scattering (SERS) optical fiber sensor devices (optrodes), as realized through nanosphere lithography. The Lab-on-Fiber SERS optrode consists of polystyrene nanospheres in a close-packed arrays configuration covered by a thin film of gold on the optical fiber tip. The SERS surfaces were fabricated by using a nanosphere lithography approach that is already demonstrated as able to produce highly repeatable patterns on the fiber tip. In order to engineer and optimize the SERS probes, we first evaluated and compared the SERS performances in terms of Enhancement Factor (EF) pertaining to different patterns with different nanosphere diameters and gold thicknesses. To this aim, the EF of SERS surfaces with a pitch of 500, 750 and 1000 nm, and gold films of 20, 30 and 40 nm have been retrieved, adopting the SERS signal of a monolayer of biphenyl-4-thiol (BPT) as a reliable benchmark. The analysis allowed us to identify of the most promising SERS platform: for the samples with nanospheres diameter of 500 nm and gold thickness of 30 nm, we measured values of EF of 4 × 105, which is comparable with state-of-the-art SERS EF achievable with highly performing colloidal gold nanoparticles. The reproducibility of the SERS enhancement was thoroughly evaluated. In particular, the SERS intensity revealed intra-sample (i.e., between different spatial regions of a selected substrate) and inter-sample (i.e., between regions of different substrates) repeatability, with a relative standard deviation lower than 9 and 15%, respectively. Finally, in order to determine the most suitable optical fiber probe, in terms of excitation/collection efficiency and Raman background, we selected several commercially available optical fibers and tested them with a BPT solution used as benchmark. A fiber probe with a pure silica core of 200 µm diameter and high numerical aperture (i.e., 0.5) was found to be the most promising fiber platform, providing the best trade-off between high excitation/collection efficiency and low background. This work, thus, poses the basis for realizing reproducible and engineered Lab-on-Fiber SERS optrodes for in-situ trace detection directed toward highly advanced in vivo sensing.

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Surface-Enhanced Resonance Raman Scattering (SERRS) Using Au Nanohole Arrays on Optical Fiber Tips

Cited by 39 publications

References 41 publications

Optical fiber tip templating using direct focused ion beam milling

Optical fiber tip templating using direct focused ion beam milling

Fiber-optic plasmonic probe with nanogap-rich Au nanoislands for on-site surface-enhanced Raman spectroscopy using repeated solid-state dewetting

Nanosphere Lithography on Fiber: Towards Engineered Lab-On-Fiber SERS Optrodes

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