Direct enhancement of luminescence of CdxZn1−xSeyS1−y/ZnS nanocrystals with gradient chemical composition by plasmonic nanoantennas

Toropov, N. A.; Kamalieva, Aisylu N.; Volkov, Roman O.; Kolesova, Ekaterina; Volgina, Dominika-Olga A.; Cherevkov, Sergei A.; Dubavik, Aliaksei; Vartanyan, T. A.

doi:10.1016/j.optlastec.2019.105821

Cited by 8 publications

(11 citation statements)

References 32 publications

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“…We considered that fluorophores located close to the metallic surface of NPs experience reducing or even are entirely quenched of their fluorescence. [ 46,47 ] Usually to minimize this effect, a dielectric layer can be used. [ 47 ] In this work, we use a PMMA dielectric layer deposited on the surface of Ag NPs through the spin‐coating technique.…”

Section: Methodsmentioning

confidence: 99%

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Polarized Stimulated Emission of 2D Ensembles of Plasmonic Nanolasers

Toropov

Kamalieva²,

Starovoytov

et al. 2020

Advanced Photonics Research

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Plasmonic nanolasers produce coherent light with wavelengths on a scale similar to their own or larger. In the past decade they have attracted intense interest, particularly from the emerging areas of integrated photonic circuits and biomedicine. Despite these capabilities, plasmonic nanolasers are still not completely understood, and this lack of understanding leads to confusing them with spasers and random lasers. Herein, the operation of pure spaser‐based plasmonic nanolaser arrays is presented. For this, a monolayer of silver nanoparticles (NPs) affixed to a dielectric surface and covered with a fluorescent polymethyl methacrylate (PMMA)–coumarin solid composite is investigated. The input–output characteristic measured for the composites on a bare substrate (without Ag NPs) reveals that the emission at pump pulse energies above 2.4 mJ (at 355 nm excitation wavelength) stops growing, and instead is inhibited by saturation. In contrast, in such structures with Ag NPs an additional emission band pops up over a fluorescence background. It has a spectral width order of units of nanometers and its intensity grows faster than at lower pump pulse energies, revealing a nonlinear dependence of the input–output characteristic. The spaser‐based lasing observed is completely linearly polarized and clearly directed as 45° from the substrate.

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Section: Methodsmentioning

confidence: 99%

“…[ 46,47 ] Usually to minimize this effect, a dielectric layer can be used. [ 47 ] In this work, we use a PMMA dielectric layer deposited on the surface of Ag NPs through the spin‐coating technique. Following the work, [ 48 ] the thickness of PMMA layers was set to 10 nm.…”

Section: Methodsmentioning

confidence: 99%

Polarized Stimulated Emission of 2D Ensembles of Plasmonic Nanolasers

Toropov

Kamalieva²,

Starovoytov

et al. 2020

Advanced Photonics Research

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“…The success of this approach is demonstrated for various spacer materials, including inorganic materials, 104 biospacers, 79,105 liquid crystals, 90 and polymeric films. 64,66,70 The reported systems are, in essence, mostly None PL intensity enhancement [50][51][52][53][54][55][56][57][58] /quenching 52,54,56 PL lifetime 50,51,53,54,56,57,59,60 PL detection sensitivity in different optical configuration 55 Temperature dependent PL enhancement and wavelength shift (4 to 300 K) 61 Surface plasmon(SP)-exciton, exciton-SP, and exciton-SP-photon conversion 62 Energy transfer time 54 Excitation-wavelength-dependent PL enhancement 54 PL polarization 58 /directionality 58 Up-conversion emissions enhancement 60 Radiation pattern 59 Purcell factor 59 Organic (PVA, PMMA, PS,. .…”

Section: Structural Design Considerationsmentioning

confidence: 99%

“…Silica or silicon dioxide (SiO 2 ) is one of the commonly applied spacer materials. 46,57,59,61 Thus, Fedutik et al 53 and Wei et al, 62 respectively, deposited a 4 to 30 nm and 25 nm silica layer onto silver nanorods on a glass substrate, followed by spincoating of the respective CdSe QDs and CdSeTe/ZnS QDs onto the silica layer to study the modulation of QDs optical properties induced by plasmon resonance. The choice of SiO 2 originates from its optical transparency in the visible light region, mechanical robustness, chemical inertness, low intrinsic toxicity, thermal stability, and low-cost production.…”

Section: Inorganic Spacersmentioning

confidence: 99%

From static to active photoluminescence tuning: functional spacer materials for plasmon–fluorophore interaction

et al. 2023

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“… 9 − 11 One of the resultant plasmon–exciton coupling systems serves to increase the local density of optical states and consequently improve the spontaneous emission rate commonly referred to as the Purcell effect. 12 , 13 This approach has been implemented especially for the significant enhancement of photoluminescence (PL) of quantum dots, carbon nanodots, and molecular dyes placed in the near-field vicinity of a plasmonic NS. 14 − 17 Such enhancement offers huge potential applications for increasing the optical absorption and the fluorescence intensity of metal-coupled fluorophores.…”

Section: Introductionmentioning

confidence: 99%

Plasmon–Exciton Coupling Effect in Nanostructured Arrays for Optical Signal Amplification and SARS-CoV-2 DNA Sensing

Tukur

Bagra

Jayapalan

et al. 2023

ACS Appl. Nano Mater.

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A surface plasmon resonance (SPR)-enhanced optical signal using a nanoslit array and acridine orange (AO) dye system at a flexible poly(dimethylsiloxane) (PDMS) substrate was achieved in this work and demonstrated a simple sensing scheme to directly detect SARS-CoV-2 nucleic acid via DNA hybridization. A simple nanoimprinting pattern transfer technique was introduced to form uniform reproducible nanoslit arrays where the dimensions of the slit array were controlled by the thickness of the gold film. The plasmon–exciton coupling effect on the optical enhancement of different dye molecules, i.e., AO, propidium iodide (PI), or dihydroethidium (DHE) attached to the nanoslit surfaces, was examined thoroughly by measuring the surface reflection and fluorescence imaging. The results indicate that the best overlap of the plasmon resonance wavelength to the excitation spectrum of AO presented the largest optical enhancement (∼57×) compared to the signal at flat gold surfaces. Based on this finding, a sensitive assay for detecting DNA hybridization was generated using the interaction of the selected SARS-CoV-2 ssDNA and dsDNA with AO to trigger the metachromatic behavior of the dye at the nanoarray surfaces. We found strong optical signal amplification on the formation of acridine-ssDNA complexes and a quenched signal upon hybridization to the complementary target DNA (ct-DNA) along with a blue shift in the fluorescence of AO-dsDNAs. A quantitative evaluation of the ct-DNA concentration in a range of 100–0.08 nM using both the reflection and emission imaging signals demonstrated two linear regimes with a lowest detection limit of 0.21 nM. The sensing method showed high sensitivity and distinguished signals from 1-, 2-, and 3-base mismatched DNA targets, as well as high stability and reusability. This approach toward enhancing optical signal for DNA sensing offers promise in a general, rapid, and direct vision detection method for nucleic acid analytes.

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Direct enhancement of luminescence of CdxZn1−xSeyS1−y/ZnS nanocrystals with gradient chemical composition by plasmonic nanoantennas

Cited by 8 publications

References 32 publications

Polarized Stimulated Emission of 2D Ensembles of Plasmonic Nanolasers

Polarized Stimulated Emission of 2D Ensembles of Plasmonic Nanolasers

From static to active photoluminescence tuning: functional spacer materials for plasmon–fluorophore interaction

Plasmon–Exciton Coupling Effect in Nanostructured Arrays for Optical Signal Amplification and SARS-CoV-2 DNA Sensing

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