Crossed Surface Relief Gratings as Nanoplasmonic Biosensors

Nair, Srijit; Escobedo, Carlos; Sabat, Ribal Georges

doi:10.1021/acssensors.6b00696

Cited by 69 publications

(49 citation statements)

References 41 publications

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“…According to the above bulk RI sensitivities ( S ) and standard deviations (σ), the bulk RI resolutions of the resonance dip at λ 1 (calculated as σ/ S ) at different incidence angles were calculated to be 2.13391 × 10 −4 RIU for θ = 0°; 1.33549 × 10 −4 RIU for θ = 10°; 1.46952 × 10 −4 RIU for θ = 20°; 3.52736 × 10 −4 RIU for θ = 30°; and 4.64362 × 10 −4 RIU for θ = 40°, as depicted in Figure S8f (Supporting Information). These sensing resolutions of the resonance dip at λ 1 were comparable to those of asymmetric ring/disk nanocavity, nanomushroom arrays, nanohole arrays, nanodisk arrays, crossed nanogratings, and nanocrosses, which in principle could be further improved by optimizing the optical detection system, such as by using a high spectral resolution optical spectrometer and a stable light source. As shown in Figure S8 (Supporting Information), the resonance dip at λ 1 exhibited the best sensing resolution at an incidence angle of 10°, other than at the normal incidence.…”

Section: Resultsmentioning

confidence: 79%

Large‐Scale Plasmonic Nanodisk Structures for a High Sensitivity Biosensing Platform Fabricated by Transfer Nanoprinting

Liang

Cui

et al. 2019

Advanced Optical Materials

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safety, and environmental monitoring, owing to their stronger near-field confined capacity on the surface, as compared with that of prism-based metallic film sensors. [1][2][3][4][5][6][7][8][9][10][11] Moreover, surface plasmon resonance (SPR) in plasmonic nanostructures can be directly excited by using simple free-space incident light instead of complex and bulky optical prism excitation systems, which exhibits great potential for developing ultracompact and multiplexed sensing applications. [12][13][14][15] Many efforts have been focused on engineering the topography and materials of nanostructures to improve their sensitivity and to realize portable sensing applications, such as nanoholes, [16][17][18] nanodisks, [19][20][21] nanorings, [22,23] and nanomushroom arrays. [24] To date, most plasmonic nanostructure sensors have been fabricated by lithography-based top-down nanofabrication technologies, for example, focused ion beam milling [25,26] and electron beam lithography. [19][20][21][22][23][24] Although they have high preparation precision, good stability, and repeatability, these top-down nanofabrication technologies suffer from some inherent shortcomings, such as high equipment cost, time-consuming fabrication, low yields, and small footprint sizes (usually limited to below 100 µm × 100 µm), which severely restrict the practical applications of plasmonic nanostructure sensors. In addition, because of the abovementioned small sensor footprint, the angle-dependent sensing properties are relatively less studied. [27][28][29] To overcome these drawbacks, bottom-up nanofabrication technologies, such as nanosphere lithography and tunable holographic lithography, are used to generate large-scale ordered nanostructure arrays with low cost and facile fabrication. [30,31] However, large-scale fabrication approaches are mainly used to fabricate sunken nanostructures, such as nanoholes or nanogrooves. [28,31,32] The relatively low sensing capabilities of sunken nanostructures make them uncompetitive with those of prism-based SPR sensors. Therefore, there is an urgent demand for the realization of large-scale, low cost biosensors with convex nanostructures, such as large scale fabrication of nanostructures by laserinduced dewetting and laser ablation methods. [33,34] In this paper, we reported a centimeter-scale, convex plasmonic nanostructure as a sensing platform fabricated by low cost transfer nanoprinting and based on an ultrathin anodic Surface plasmon resonance in plasmonic nanostructures has become a powerful analytical tool in ultrasensitive label-free biomolecule sensing. However, the fabrication of plasmonic nanostructure sensors relies on lithography-based top-down nanofabrication approaches, which have inherent shortcomings, such as high manufacturing cost, time-consuming fabrication, and a small fabrication footprint. In particular, the small footprint of fabricated plasmonic nanostructures has significantly restrained the study of their angle-dependent sensitivity. Here, a centimeter-scale, high sensit...

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Section: Resultsmentioning

confidence: 79%

Large‐Scale Plasmonic Nanodisk Structures for a High Sensitivity Biosensing Platform Fabricated by Transfer Nanoprinting

Liang

Cui

et al. 2019

Advanced Optical Materials

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“…The study of biological analytes through optical and nanophotonic structures (mainly metallic‐based ones) has been an actively developing research area for the last few decades . The operation principle of the vast majority of proposed biosensors is based on the dependence of the plasmonic resonance of metal NPs on their environment, where the NPs are hosted .…”

Section: Biosensing With Resonant Dielectric Nanoparticlesmentioning

confidence: 99%

Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures

Krasnok

Caldarola

Bonod

et al. 2018

Advanced Optical Materials

135

123

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Resonant dielectric nanoparticles made of materials with large positive dielectric permittivity, such as Si, GaP, GaAs, have become a powerful platform for modern light science, enabling various fascinating applications in nanophotonics and quantum optics. In addition to light localization at the nanoscale, dielectric nanostructures provide electric and magnetic resonant responses throughout the visible and infrared spectrum, low dissipative losses and optical heating, low doping effect, and absence of quenching, which are interesting for spectroscopy and biosensing applications. This review presents state‐of‐the‐art applications of optically resonant high‐index dielectric nanostructures as a multifunctional platform for light–matter interactions. Nanoscale control of quantum emitters and applications for enhanced spectroscopy including fluorescence spectroscopy, surface‐enhanced Raman scattering, biosensing, and lab‐on‐a‐chip technology are surveyed. The theoretical background underlying these effects is described, realizations of specific resonant dielectric nanostructures and hybrid excitonic systems are overviewed, and an outlook of the challenges in this field, which remain open to future research, is provided.

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“…We performed a biotin-streptavidin assay on these nanostructures to assess this potential. The gold was functionalized with cysteamine via its thiol group, followed by the oriented attachment of biotin-NHS to the cysteamine (as described in [33,34]). This platform was used for an assay of fluorescently-labeled (Cy3) streptavidin.…”

Section: Nanostructure Functionalizationmentioning

confidence: 99%

Electrokinetically-Driven Assembly of Gold Colloids into Nanostructures for Surface-Enhanced Raman Scattering

et al. 2020

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Surface-enhanced Raman scattering (SERS) enables the highly sensitive detection of (bio)chemical analytes in fluid samples; however, its application requires nanostructured gold/silver substrates, which presents a significant technical challenge. Here, we develop and apply a novel method for producing gold nanostructures for SERS application via the alternating current (AC) electrokinetic assembly of gold nanoparticles into two intricate and frequency-dependent structures: (1) nanowires, and (2) branched “nanotrees”, that create extended sensing surfaces. We find that the growth of these nanostructures depends strongly on the parameters of the applied AC electric field (frequency and voltage) and ionic composition, specifically the electrical conductivity of the fluid. We demonstrate the sensing capabilities of these gold nanostructures via the chemical detection of rhodamine 6G, a Raman dye, and thiram, a toxic pesticide. Finally, we demonstrate how these SERS-active nanostructures can also be used as a concentration amplification device that can electrokinetically attract and specifically capture an analyte (here, streptavidin) onto the detection site.

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Crossed Surface Relief Gratings as Nanoplasmonic Biosensors

Cited by 69 publications

References 41 publications

Large‐Scale Plasmonic Nanodisk Structures for a High Sensitivity Biosensing Platform Fabricated by Transfer Nanoprinting

Large‐Scale Plasmonic Nanodisk Structures for a High Sensitivity Biosensing Platform Fabricated by Transfer Nanoprinting

Spectroscopy and Biosensing with Optically Resonant Dielectric Nanostructures

Electrokinetically-Driven Assembly of Gold Colloids into Nanostructures for Surface-Enhanced Raman Scattering

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