Influence of the CTAB surfactant layer on optical properties of single metallic nanospheres

Movsesyan, Artur; Marguet, Sylvie; Muravitskaya, Alina; Béal, Jérémie; Adam, Pierre‐Michel; Baudrion, Anne-Laure

doi:10.1364/josaa.36.000c78

Cited by 18 publications

(11 citation statements)

References 48 publications

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“…In Figure , we depict a simulated extinction spectrum (blue curve) of 50 nm height and 70 nm-diameter SNC covered with a layer of a dielectric of 1.5 RI. It represents an usual polymer layer that is often used to deposit the emitters or molecules of interest. ,, In comparison with the uncovered SNC on the glass substate, herein, we observe four modes denoted α, β, γ, and δ. From the first view, we note that mode (γ) is at the spectral position (around 380 nm) of plasmonic mode (ii), which we observed previously in Figure a.…”

Section: Results and Discussionmentioning

confidence: 76%

Hybridization and Dehybridization of Plasmonic Modes

et al. 2020

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The plasmon resonances (modes) of a metal nanostructure can be defined as a dipole, a quadrupole, or high-order modes depending on the surface charge distribution induced by the incident field. In a non-symmetrical environment or clusters, the modes can hybridize and exhibit different behavior and properties. In this work, we study experimentally and numerically the substrate-induced hybridization of plasmonic modes of a silver nanocylinder. The applications of plasmonic nanoparticles such as refractive index sensing and enhanced spectroscopies often rely on the sustained mode spectral position and specific spatial near-field distribution. However, we show that the implementation of such plasmonic nanoparticles in a sensing system can result in a change of the modes nature, its hybridization or dehybridization. These changes are not clearly pronounced in the far-field spectra and then may result in unexpected modifications of the sensor behavior. We show that the hybridization between the dipolar and quadrupolar modes of the plasmonic nanoparticle on the substrate results from quadrupolar mode excitation due to the superposition of the reflected and incoming light and, then, depends on the reflection of the substrate. The existence of the hybridized modes strongly depends on the surrounding environment of nanoparticles, and after the deposition of the nanometric polymer layer on top of the nanoparticle the hybridized modes vanish and are replaced by uncoupled multipolar resonances.

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Section: Results and Discussionmentioning

confidence: 76%

Hybridization and Dehybridization of Plasmonic Modes

et al. 2020

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“…Generally, the thickness of the CTAB layer in solution is about 3 nm. However, on the surface of dried nanoparticles coated on a substrate, the CTAB layer becomes much thicker [70]. Studies of core-shell particles suggest that a thickness of 7~10 nm is necessary to act like a dielectric layer, and the thickness of the CTAB layer on the substrate is considered to be approximately the same [71].…”

Section: Resultsmentioning

confidence: 99%

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

et al. 2021

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Compact and highly sensitive near-infrared photodetectors that are operable at room temperature are required for light detection and ranging and medical devices. Two-dimensional (2D) PtSe2, a transition metal dichalcogenide, is a candidate material for near-infrared light detection. However, the photoresponse properties of 2D PtSe2 are currently inferior to those of commercial materials. The localized surface plasmon resonance of Au has been widely used for photoelectric field enhancement and in photochemical reactions associated with phase relaxation from plasmon states that occur at specific wavelengths. Spherical Au nanocolloids exhibit an extinction peak in the visible light region, whereas nanorods can be tuned to exhibit the extinction peak in the near-infrared region by controlling their aspect ratio. In this study, hybrid Au nanorod/2D PtSe2 structure was fabricated via spin coating nanorods, with plasmon peaks in the near-infrared region, on 2D PtSe2. Furthermore, the effect of the concentration of the nanorod solution on the photoresponse of nanorod/2D PtSe2 was investigated. The photocurrent of 5 nM Au nanorod-coated 2D PtSe2 was fivefold higher than that of bare 2D PtSe2. The responsivity was maximum 908 μW/A at 0.5 V bias voltage. In addition, the photocurrent enhancement mechanism by Au nanorods is discussed.

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“…Hence, it is preferable not to calculate the enhancement factor of the excitation rate in a single position of the near-field. Consequently, we present in Figure 5B the calculation of the integrated electric field to the forth power (E 4 /E 0 4 ) over the volume occupied by the QDs for different diameters of GNCs [46]. Herein, we normalized the excitation enhancement by the value for D150 in order to obtain the ratio of the enhancement factors for different diameters similarly to the emission rate enhancement calculations.…”

Section: Resultsmentioning

confidence: 99%

Enhanced two-photon photoluminescence assisted by multi-resonant characteristics of a gold nanocylinder

et al. 2020

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AbstractMulti-resonant plasmonic simple geometries like nanocylinders and nanorods are highly interesting for two-photon photoluminescence and second harmonic generation applications, due to their easy fabrication and reproducibility in comparison with complex multi-resonant systems like dimers or nanoclusters. We demonstrate experimentally that by using a simple gold nanocylinder we can achieve a double resonantly enhanced two-photon photoluminescence of quantum dots, by matching the excitation wavelength of the quantum dots with a dipolar plasmon mode, while the emission is coupled with a radiative quadrupolar mode. We establish a method to separate experimentally the enhancement factor at the excitation and at the emission wavelengths for this double resonant system. The sensitivity of the spectral positions of the dipolar and quadrupolar plasmon resonances to the ellipticity of the nanocylinders and its impact on the two-photon photoluminescence enhancement are discussed.

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Influence of the CTAB surfactant layer on optical properties of single metallic nanospheres

Cited by 18 publications

References 48 publications

Hybridization and Dehybridization of Plasmonic Modes

Hybridization and Dehybridization of Plasmonic Modes

Photocurrent Enhancement of PtSe2 Photodetectors by Using Au Nanorods

Enhanced two-photon photoluminescence assisted by multi-resonant characteristics of a gold nanocylinder

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