scholarly journals Deterministic temperature shaping using plasmonic nanoparticle assemblies

Nanoscale ◽  
2014 ◽  
Vol 6 (15) ◽  
pp. 8984-8989 ◽  
Author(s):  
Guillaume Baffou ◽  
Esteban Bermúdez Ureña ◽  
Pascal Berto ◽  
Serge Monneret ◽  
Romain Quidant ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Temperature Field ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies

We developed a technique based on the use of smart patterns of gold nanoparticles under illumination to generate any temperature field on the microscale.

scholarly journals Multiplexed and single-cell detection of microRNA with plasmonic nanoparticle assemblies

2021 ◽  
Author(s):  
Gurbrinder Ghotra ◽  
Nguyen Le ◽  
Heyam Hayder ◽  
Chun Peng ◽  
Jennifer I. L. Chen
Keyword(s):  
Nucleic Acid ◽  
Single Cell ◽  
Low Cost ◽  
Single Cells ◽  
Cell Detection ◽  
Label Free ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies ◽  
Single Cell Detection ◽  
Target Binding

We present a label-free, low cost and miniatured biosensing platform based on the disassembly of core-satellite plasmonic nanoparticle assemblies. The rapid and selective detection of an exemplary nucleic acid biomarker, has-miRNA-210-3p, was achieved via the strand displacement nucleic acid reaction. Target binding leads to dehybridization of the DNA linkers and changes in the scattering properties of nanostructures as monitored by darkfield microscopy. We demonstrate the ability to detect microRNA expunged from single cells and the potential to multiplex discrete assemblies to enable diverse biological applicability. The work may help translate the applicability of microRNA as diagnostic biomarkers, quantitate their abundance in the microenvironment, and facilitate the study of their correlation or causation to other biomolecules at the single-cell level.

Interparticle Gap Geometry Effects on Chiroptical Properties of Plasmonic Nanoparticle Assemblies

2021 ◽  
Author(s):  
Feng Li ◽  
Skandan Chandrasekar ◽  
Aftab Ahmed ◽  
Anna Klinkova
Keyword(s):  
Rational Design ◽  
Incident Light ◽  
Structure Property ◽  
Large Area ◽  
Chiroptical Properties ◽  
Plasmonic Nanoparticle ◽  
Face To Face ◽  
Nanoparticle Assemblies ◽  
Systematic Understanding ◽  
Difference Time

Abstract Chiral linear assemblies of plasmonic nanoparticles with chiral optical activity often show low asymmetry factors. Systematic understanding of the structure-property relationship in these systems must be improved to facilitate rational design of their chiroptical response. Here we study the effect of large-area interparticle gaps in chiral linear nanoparticle assemblies on their chiroptical properties using a tetrahelix structure formed by a linear face-to-face assembly of nanoscale Au tetrahedra. Using finite-difference time-domain and finite element methods, we performed in-depth evaluation of the extinction spectra and electric field distribution in the tetrahelix structure and its dependence on various geometric parameters. The reported structure supports various plasmonic modes, one of which shows a strong incident light handedness selectivity that is associated with large face-to-face junctions. This works highlights the importance of gap engineering in chiral plasmonic assemblies to achieve g-factors greater than 1 and produce structures with a handedness-selective optical response.

scholarly journals Symmetry Breaking in Tetrahedral Chiral Plasmonic Nanoparticle Assemblies

ACS Photonics ◽  
2014 ◽  
Vol 1 (11) ◽  
pp. 1189-1196 ◽  
Author(s):  
Vivian E. Ferry ◽  
Jessica M. Smith ◽  
A. Paul Alivisatos
Keyword(s):  
Symmetry Breaking ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies

Experimental Study of Enhancement and Quenching of Plasmon-Controlled Fluorescence Using Quantum Dot–Plasmonic Nanoparticle Mixtures in Aqueous Medium

2012 ◽  
Author(s):  
Nola Palombo ◽  
Timothy Walsh ◽  
Jungchul Lee ◽  
Keunhan Park
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Quantum Dot ◽  
Near Field ◽  
Emission Spectra ◽  
Emission Wavelength ◽  
Localized Surface Plasmon ◽  
Excitation Wavelength ◽  
Distilled Water ◽  
Plasmonic Nanoparticle

This article reports the enhancement and quenching of quantum dot (QD) emission for different concentrations of plasmonic nanoparticles (PNPs) by utilizing the Brownian motion-induced dynamic near-field interactions in aqueous solution. We measured the fluorescence spectrum of two types of QD-PNP mixtures. The first mixture was QDs (525 nm for emission wavelength) and gold nanoparticles dispersed in distilled water, where the emission wavelength of the QDs matches the localized surface plasmon (LSP) excitation wavelength of the gold nanoparticles. The second mixture was QDs (655 nm for emission wavelength) and silver nanoparticles dispersed in distilled water, where LSPs excited at the wavelength of 392 nm affect the excitation of the QDs. For both experiments, the QD emission spectra were monitored while changing the concentration of the PNPs from 108 to 1011 /mL for a fixed concentration of QDs at 1 × 1013 /mL. For low PNP concentrations, the QD emission was enhanced for 30 nm gold nanoparticles and 80 nm silver nanoparticles; however, for high PNP concentrations, the QD emission was always quenched. This research reveals the dependence of the QD fluorescence on the concentration of PNPs. The obtained results will be beneficial in further understanding plasmonic interactions between QDs and nanoparticles and the manipulation of QD emission, switching from enhancement to quenching or vice versa, with the alteration of nanoparticle concentration.

scholarly journals Fast optical method for characterizing plasmonic nanoparticle adhesion on functionalized surfaces

2019 ◽  
Vol 412 (14) ◽  
pp. 3395-3404
Author(s):  
László Mérai ◽  
László Janovák ◽  
Dániel Sándor Kovács ◽  
Imre Szenti ◽  
Lívia Vásárhelyi ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Charge ◽  
Optical Method ◽  
Theoretical Calculations ◽  
Packed Column ◽  
Streaming Potential ◽  
Glass Beads ◽  
Cross Sectional ◽  
Plasmonic Nanoparticle ◽  
Vis Spectroscopy

AbstractIn this paper, a rapid optical method for characterizing plasmonic (gold) nanoparticle (AuNP) adhesion is presented. Two different methods were used for AuNP preparation: the well-known Turkevich method resulted in particles with negative surface charge; for preparing AuNPs with positive surface charge, stainless steel was used as reducing agent. The solid surface for adhesion was provided by a column packed with pristine or surface-modified glass beads. The size of the nanoparticles was studied by transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS); the surface charge of the components was determined by streaming potential measurements. The characterization of adhesion was performed in a flow system by UV-Vis spectroscopy. During the adhesion experiments, the role of the surface charge, the particle size, and the pH were studied, as well as the adhered amount of gold nanoparticles and the surface coverage values. The latter was estimated by theoretical calculations and defined by the quotient of the measured and the maximal adhered amount of nanoparticles, which could be determined by the cross-sectional area of the NPs and the specific surface area of the glass beads. The results are verified by the polarization reflectometric interference spectroscopy (PRIfS) method: silica nanoparticles with diameters of a few hundred (d~450) nanometers were immobilized on the surface of glass substrate by the Langmuir–Blodgett method, the surface was modified similar to the 3D (continuous flow packed column) system, and gold nanoparticles from different pH solutions were adhered during the measurements. These kinds of modified surfaces allow the investigation of biomolecule adsorption in the same reflectometric setup.

scholarly journals Hierarchically Structured Plasmonic Nanoparticle Assemblies with Dual-Length Scale Electromagnetic Hot Spots for Enhanced Sensitivity in the Detection of (Bio)Molecular Analytes

2021 ◽  
Vol 125 (16) ◽  
pp. 8647-8655
Author(s):  
Rishabh Rastogi ◽  
Ekoue A. Dogbe Foli ◽  
Remi Vincent ◽  
Suresh Poovathingal ◽  
Pierre-Michel Adam ◽  
...  
Keyword(s):  
Hot Spots ◽  
Length Scale ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies ◽  
Enhanced Sensitivity

scholarly journals Metabolic mapping with plasmonic nanoparticle assemblies

The Analyst ◽  
2020 ◽  
Vol 145 (7) ◽  
pp. 2586-2594 ◽  
Author(s):  
Nguyen H. Le ◽  
Gang Ye ◽  
Chun Peng ◽  
Jennifer I. L. Chen
Keyword(s):  
Gold Nanoparticle ◽  
Single Cells ◽  
Metabolic Mapping ◽  
Plasmonic Nanoparticle ◽  
Nanoparticle Assemblies

Discrete plasmonic gold nanoparticle assemblies rapidly detect ATP in single cells and microenvironments without labelling, extraction, purification or separation.

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