Probing the Plasmonic Near-Field of Gold Nanocrescent Antennas

Bukasov, Rostislav; Ali, Tamer A.; Nordlander, Peter; Shumaker‐Parry, Jennifer S.

doi:10.1021/nn101994t

Cited by 133 publications

(125 citation statements)

References 40 publications

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“…A variety of plasmonic metamaterial structures such as, nanorods, nanosphere, nanocone, nanoring, bowtie antennas, nanocrescents, plasmonic grating [3,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], fiber Bragg grating [38,39], etc. have been investigated to test the effectiveness of the structure in determining the refractive index of material medium.…”

Section: Introductionmentioning

confidence: 99%

H-Shape Plasmonic Metasurface as Refractive Index Sensor

Mandal

2014

Plasmonics

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In this report, using finite difference time domain simulation, a highly sensitive H-shape subwavelength plasmonic metasurface is demonstrated for refractive index sensor at near-infrared wavelengths. Numerical simulations show that optical transmission and reflection properties of such Hshape slit metamaterial depend significantly on the refractive index of the surrounding medium. The studies reveal that an index change of 0.5 results in a resonant frequency shift of nearly 600 nm, which is about 1200 nm shift per refractive index unit (RIU). The detection accuracy of ∼0.0035 RI for every 5 nm resonance frequency shift can be achieved. The frequency shift is explained on the basis of inductor capacitor (LC) model of the H-unit.

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Section: Introductionmentioning

confidence: 99%

H-Shape Plasmonic Metasurface as Refractive Index Sensor

Mandal

2014

Plasmonics

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“…the average distance from the surface of a metal nanostructure where a change in the RI can be detected. The sensing distance from numerous metal nanostructures has been explored experimentally using a variety of surface layer coatings including polymers, [160][161][162] silica, 163,164 or alkanethiols. 155,165 all reporting a sensing distance of around 20-30 nm.…”

Section: Sensing Volumementioning

confidence: 99%

Nanoplasmonic Sensing using Metal Nanoparticles

Martinsson¹

2014

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In our modern society, we are surrounded by numerous sensors, constantly feeding us information about our physical environment. From small, wearable sensors that monitor our physiological status to large satellites orbiting around the earth, detecting global changes. Although, the performance of these sensors have been significantly improved during the last decades there is still a demand for faster and more reliable sensing systems with improved sensitivity and selectivity. The rapid progress in nanofabrication techniques has made a profound impact for the development of small, novel sensors that enables miniaturization and integration. A specific area where nanostructures are especially attractive is biochemical sensing, where the exceptional properties of nanomaterials can be utilized in order to detect and analyze biomolecular interactions.The focus of this thesis is to investigate plasmonic nanoparticles composed of gold or silver and optimize their performance as signal transducers in optical biosensors. Metal nanoparticles exhibit unique optical properties due to excitation of localized surface plasmons, which makes them highly sensitive probes for detecting small, local changes in their surrounding environment, for instance the binding of a biomolecule to the nanoparticle surface. This is the basic principle behind nanoplasmonic sensing based on refractometric detection, a sensing scheme that offers real-time and label-free detection of molecular interactions.This thesis shows that the sensitivity for detecting local refractive index changes is highly dependent on the geometry of the metal nanoparticles, their interaction with neighboring particles and their chemical composition and functionalization. An increased knowledge about how these parameters affects the sensitivity is essential when developing nanoplasmonic sensing devices with high performance based on metal nanoparticles. VI VII Populärvetenskaplig sammanfattningI dagens samhälle finns en påtaglig vilja och strävan efter att kunna mäta, övervaka, analysera och reglera vardagliga funktioner och beteenden. Detta har lett till en explosionsartad utveckling av nya, funktionella sensorer som numera finns överallt i våra liv -i hemmet, på arbetsplatsen, i våra fickor och till och med inuti våra kroppar. En biosensor är en särskild typ av sensor som används för att detektera specifika kemiska eller biologiska ämnen genom att omvandla förekomsten av dessa ämnen till en mätbar signal. Biosensorer kan användas inom flera olika områden som livsmedelindustri, processövervakning, kriminalteknologi samt inom medicinsk diagnostik. Ofta är dock koncentrationen av de eftersökta ämnena mycket låg vilket ställer stora krav på sensorernas känslighet och precision.I denna avhandling beskrivs hur nanopartiklar av guld och silver kan användas som signalomvandlare i optiska biosensorer. Metalliska nanopartiklar har unika optiska egenskaper vilket gör dem väldigt känsliga mot små förändringar i dess absoluta närhet. Sådana förändringar ger upphov till en färgf...

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“…Those substrates, however, are usually expensive and require plasma (or piranha solution) cleaning due to relatively strong adsorption of thiolates and other organic compounds to the gold and silver surface. 8 Also, even gold nanostructures, such as nanocrescents would change their shape, including the tip radius of curvature, if exposed to a buffer solution for just several hours, 9 which is even more the case for silver triangular nano-pyramids prepared by Van Duyne group. 10 Those changes in addition to the formation of an oxide film are likely to impact the SERS enhancement factors, making them less reproducible.…”

Section: Introductionmentioning

confidence: 99%

Detection of Paracetamol in Water and Urea in Artificial Urine with Gold Nanoparticle@AI Foil Cost-efficient SERS Substrate

et al. 2018

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We demonstrated that a cost-efficient, easy to prepare, hybrid SERS substrate-gold nanoparticles (AuNPs) on untreated Al foil (AlF) can effectively detect pharmaceuticals, such as paracetamol and clinical biomarkers, like urea in artificial urine. The limit of detection (LOD) for paracetamol on AuNPs on AlF is superior (0.1 vs. 1 mM ) to the LOD reported for SERS detection of paracetamol in the literature. For SERS detection of urea in urine, AuNPs on both Al foil and Au film performed much better than AuNPs on glass, in terms of the concentration range, linearity and LOD. However, assay on AuNPs on AlF showed a better semi-logarithmic trendline with R 2 = 0.98 than an assay on AuNPs on Au film with R 2 = 0.94. They have comparable sensitivity with LOD 0.024 and 0.017 M, respectively. The limit of quantification (LOQ) of the former is 0.026 M, which makes it sufficient for the quantification of urea in urine at both normal and pathophysiological (0.03 -0.15 M) concentration.

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Probing the Plasmonic Near-Field of Gold Nanocrescent Antennas

Cited by 133 publications

References 40 publications

H-Shape Plasmonic Metasurface as Refractive Index Sensor

H-Shape Plasmonic Metasurface as Refractive Index Sensor

Nanoplasmonic Sensing using Metal Nanoparticles

Detection of Paracetamol in Water and Urea in Artificial Urine with Gold Nanoparticle@AI Foil Cost-efficient SERS Substrate

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