Plasmonic Enhancement of Two-Photon-Excited Luminescence of Single Quantum Dots by Individual Gold Nanorods

Zhang, Weichun; Caldarola, Martín; Lu, Xuxing; Orrit, Michel

doi:10.1021/acsphotonics.8b00306

Cited by 49 publications

(43 citation statements)

References 52 publications

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“…Moreover, studies of PL from phosphor 58 and photoconductive phosphor 59 showed a superlinear increase in PL intensity. A quadratic increase of PL intensity have been also observed in quantum dots which exhibit PL emission by two-photon absorption under ultrafast laser excitations 40,60 . In general, the origin of the superlinear PL behavior is closely related to the dynamics of the photoexcited carriers in the nanostructure.…”

Section: Results and Analisismentioning

confidence: 77%

Superlinear Photoluminescence by Ultrafast Laser Pulses in Dielectric Matrices with Metal Nanoclusters

Bornacelli

Torres-Torres

Silva-Pereyra

et al. 2019

Sci Rep

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An intense photoluminescence emission was observed from noble metal nanoclusters (Pt, Ag or Au) embedded in sapphire plates, nucleated by MeV ion-implantation and assisted by an annealing process. In particular, the spectral photoluminescence characteristics, such as range and peak emission, were compared to the behavior observed from Pt nanoclusters embedded in a silica matrix and excited by UV irradiation. Correlation between emission energy, nanoclusters size and metal composition were analyzed by using the scaling energy relation E Fermi / N 1/3 from the spherical Jellium model. The metal nanocluster luminescent spectra were numerically simulated and correctly fitted using the bulk Fermi energy for each metal and a Gaussian nanoclusters size distribution for the samples. Our results suggest protoplasmonics photoluminescence from metal nanoclusters free of surface state or strain effects at the nanoclusters-matrix interface that can influence over their optical properties. These metal nanoclusters present very promising optical features such as bright visible photoluminescence and photostability under strong picosecond laser excitations. Besides superlinear photoluminescence from metal nanoclusters were also observed under UV high power excitation showing a quadratic dependence on the pump power fluence.

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Section: Results and Analisismentioning

confidence: 77%

Superlinear Photoluminescence by Ultrafast Laser Pulses in Dielectric Matrices with Metal Nanoclusters

Bornacelli

Torres-Torres

Silva-Pereyra

et al. 2019

Sci Rep

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“…Integrating the single-molecule signal for a single peak yields integrated count rates between 0.6 × 10 5 to 8 × 10 6 cts•s −1 (SI Appendix, Fig. S17), exceeding nearly all single-dye molecule and quantum dot count rates reported to date (SI Appendix, Table T2) (19,20,(55)(56)(57)(58)(59)(60)(61)(62)(63). Single-molecule SERS in such an optimized geometry is thus a powerful candidate for single-photon light sources with superior count rates without suffering from blinking or bleaching.…”

Section: Superefficient Plasmonic Nanoarchitectures For Raman Kineticmentioning

confidence: 84%

Cascaded nanooptics to probe microsecond atomic-scale phenomena

Kamp

Nijs

Kongsuwan

et al. 2020

Proc. Natl. Acad. Sci. U.S.A.

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Plasmonic nanostructures can focus light far below the diffraction limit, and the nearly thousandfold field enhancements obtained routinely enable few- and single-molecule detection. However, for processes happening on the molecular scale to be tracked with any relevant time resolution, the emission strengths need to be well beyond what current plasmonic devices provide. Here, we develop hybrid nanostructures incorporating both refractive and plasmonic optics, by creating SiO2nanospheres fused to plasmonic nanojunctions. Drastic improvements in Raman efficiencies are consistently achieved, with (single-wavelength) emissions reaching 107counts⋅mW−1⋅s−1and 5 × 105counts∙mW−1∙s−1∙molecule−1, for enhancement factors >1011. We demonstrate that such high efficiencies indeed enable tracking of single gold atoms and molecules with 17-µs time resolution, more than a thousandfold improvement over conventional high-performance plasmonic devices. Moreover, the obtained (integrated) megahertz count rates rival (even exceed) those of luminescent sources such as single-dye molecules and quantum dots, without bleaching or blinking.

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“…2021, 11, 1375 2 of 13 gap [2]. This enhancement is due to the strong modifications of local fields, that also change the luminescence properties [3][4][5]. The analysis of fine structured electronic-vibrational luminescence spectra is also quite a productive analytical method, but usually at cryogenic conditions [6,7], as well as comparison of data on phonoluminescence and Raman scattering [8].…”

Section: Introductionmentioning

confidence: 99%

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

et al. 2021

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This paper presents a cost-effective approach for the template-assisted electrodeposition fabrication of substrates for surface-enhanced Raman scattering (SERS) with metal nanowires (NWs) grown in pores of polymer track-etched membranes (TM). This technique allows the synthesis of NWs array with its certain surface density and diameter (from dozen to hundreds of nm). NWs length also may be varied (order of μm) by controlling deposition time. Here we grow vertical Ag-NWs which are leaning towards their nearest neighbors, forming self-assembled bundles whose parameters depend on the NW aspect ratio (length to diameter). We show that in such bundles there are “hot spots” in the nm-gaps between NWs tips. Computer simulations have demonstrated a strong enhancement of the electric field within these hot spots; thus, the Raman signal is markedly amplified for analyte molecules placed directly inside the gaps. We have experimentally proved the potential of this SERS-technique on the example of 4-Mercaptophenylboronic acid (4-MPBA). For 4-MPBA the maximal enhancement of Raman signal was found at NWs length of ~1.6 μm and diameter of ~100 nm. The effect is higher (up to twice) if “wet” substrate is used just immediately after the TM polymer removal so that the tips are brought to lean after analyte exposure. We suggest this new type of nanostructured SERS-substrates as a base of effective sensing of extremely low concentration of analytes.

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Plasmonic Enhancement of Two-Photon-Excited Luminescence of Single Quantum Dots by Individual Gold Nanorods

Cited by 49 publications

References 52 publications

Superlinear Photoluminescence by Ultrafast Laser Pulses in Dielectric Matrices with Metal Nanoclusters

Superlinear Photoluminescence by Ultrafast Laser Pulses in Dielectric Matrices with Metal Nanoclusters

Cascaded nanooptics to probe microsecond atomic-scale phenomena

Ag-Nanowire Bundles with Gap Hot Spots Synthesized in Track-Etched Membranes as Effective SERS-Substrates

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