Photonic Engineering of Hybrid Metal–Organic Chromophores

Busson, Mickaël P.; Rolly, Brice; Stout, Brian; Bonod, Nicolas; Wenger, Jérôme; Bidault, Sébastien

doi:10.1002/anie.201205995

Cited by 29 publications

(27 citation statements)

References 32 publications

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“…40–50 μs and 7–8 ms that were attributed to the rotational and translational Brownian motion of the dye-particle across the confocal volume. A similar behavior of the FCS correlation curves has been previously reported for the emission of dimeric gold nanoparticles conjugated to Atto-647N dye [39]. The ACF’s from PPh-1 to 3 were fitted with a two-component model for describing rotational and translational diffusion of the dye-particle assemblies:G(τ)−1=(1−Ase−τ/ts)×1N(1+τtd)−1(1+τκ2·td)−1/2 in which τ is the lag time, As is the amplitude of the rotational correlation, ts is the rotational diffusion time, N is the number of emitters in the detection volume, td is the transverse translational diffusion time, and κ is the ratio between the longitudinal and transverse dimensions of the detection volume.…”

Section: Resultssupporting

confidence: 83%

Density Gradient Selection of Colloidal Silver Nanotriangles for Assembling Dye-Particle Plasmophores

et al. 2019

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A simple method based on sucrose density gradient centrifugation is proposed here for the fractionation of colloidal silver nanotriangles. This method afforded particle fractions with surface plasmon resonances, spanning from red to infrared spectral ranges that could be used to tune optical properties for plasmonic applications. This feature was exemplified by selecting silver nanotriangle samples with spectral overlap with Atto-655 dye’s absorption and emission in order to assemble dye-particle plasmophores. The emission brightness of an individual plasmophore, as characterized by fluorescence correlation spectroscopy, is at least 1000-fold more intense than that of a single Atto-655 dye label, which renders them as promising platforms for the development of fluorescence-based nanosensors.

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Section: Resultssupporting

confidence: 83%

Density Gradient Selection of Colloidal Silver Nanotriangles for Assembling Dye-Particle Plasmophores

et al. 2019

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“…Generally, DNA-templated plasmonic dimers are produced with spacings ranging between 10 nm and 20 nm in order to have a nanoscale control over the interparticle distance and over the position of a fluorescent emitter in the gap. 19,[33][34][35][36][37][38][39][40] However, smaller spacings can be reached, in a controlled way, by assembling AuNPs with a DNA strand perpendicular to the dimer axis. 49,58 Furthermore, the interparticle distance can be actively and progressively reduced by screening the repulsive electrostatic interaction between the negatively charged AuNPs 59,60 or by a thermal treatment.…”

Section: Reaching Sub-2 Nm Interparticle Spacings Reproduciblymentioning

confidence: 99%

Few-Molecule Strong Coupling with Dimers of Plasmonic Nanoparticles Assembled on DNA

et al. 2021

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Hybrid nanostructures, in which a known number of quantum emitters are strongly coupled to a plasmonic resonator, should feature optical properties at room temperature such as few-photon nonlinearities or coherent superradiant emission. We demonstrate here that this coupling regime can only be reached with dimers of gold nanoparticles in stringent experimental conditions, when the interparticle spacing falls below 2 nm. Using a short transverse DNA double-strand, we introduce 5 dye molecules in the gap between two 40 nm gold particles and actively decrease its length down to sub-2 nm values by screening electrostatic repulsion between the particles at high ionic strengths. Single-nanostructure scattering spectroscopy then evidences the observation of a strong-coupling regime in excellent agreement with electrodynamic simulations. Furthermore, we highlight the influence of the planar facets of polycrystalline gold nanoparticles on the probability of observing strongly coupled hybrid nanostructures.

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“…To provide a better control on the nanogap distance and provide more reproducible antennas, the self-assembly of metal nanoparticles can be templated by DNA double strands [39,40,41,42,43] or DNA origami [16,17,44,45]. This latter approach constitutes a powerful method to assemble nanoparticles into complex 3D designs with gap size tunability (Fig.…”

Section: Bottom-up Self Assemblymentioning

confidence: 99%

Fluorescence Spectroscopy Enhancement on Photonic Nanoantennas

Wenger¹

2019

Plasmonics in Chemistry and Biology

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Introduction and motivationDespite the significant progress in single molecule fluorescence microscopy made over the last two decades, the efficient detection of a single molecule remains a major goal with applications in chemical, biochemical and biophysical analysis [1,2]. The phenomenon of light diffraction appears as a main physical limiting factor. Indeed, there is a huge size mismatch between a single molecule (below 5 nm) and the wavelength of light (around 500 nm). This size mismatch prevents the efficient interaction between an incoming light beam from a conventional optical microscope and a single fluorescent molecule, so the net detected fluorescence signal from a single molecule (ultimately defining the sensitivity and dynamic temporal resolution achievable) remain limited [3].Additionally, conventional optical microscopes are restricted to conditions of low density (or concentration) of fluorescent molecules [1,4]. In order to isolate a single molecule in the diffraction-limited volume of a confocal microscope, the concentration range must be typically in the pico to nanomolar range. However, a large majority of enzymes and proteins requires concentrations in the micro to millimolar range to reach relevant reaction kinetics and biochemical stability. Monitoring single molecules at high physiological concentrations thus requires overcoming the diffraction limit to confine light in a nanometer spot of volume in the zepto-(10 −21 ) or atto-(10 −18 ) liter range, more than three orders of magnitude below the femtoliter volumes achieved with confocal microscopes [5,6].Confining light to the nanoscale can be achieved thanks to optical antennas [7]. Optical antennas are generally metallic nanostructures with dimensions much below the wavelength of light [8,9].Like their radiofrequency counterparts, optical antennas convert propagating radiation into localized energy and vice-versa [7]. This opens new routes to enhance and control the emission from a single fluorescent emitter by improving the light-matter interaction between a single fluorescent molecule and the incoming beam, leading to the phenomenon of antenna-enhanced fluorescence emission [10,11,12]. Over thousand-fold enhancement of the single molecule fluorescence signal was reported 1 arXiv:1709.06749v1 [physics.chem-ph]

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Photonic Engineering of Hybrid Metal–Organic Chromophores

Cited by 29 publications

References 32 publications

Density Gradient Selection of Colloidal Silver Nanotriangles for Assembling Dye-Particle Plasmophores

Density Gradient Selection of Colloidal Silver Nanotriangles for Assembling Dye-Particle Plasmophores

Few-Molecule Strong Coupling with Dimers of Plasmonic Nanoparticles Assembled on DNA

Fluorescence Spectroscopy Enhancement on Photonic Nanoantennas

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