Fluorescence Enhancement and Spectral Shaping of Silicon Quantum Dot Monolayer by Plasmonic Gap Resonances

Yashima, Shiho; Sugimoto, Hiroshi; Takashina, Hiroyuki; Fujii, Minoru

doi:10.1021/acs.jpcc.6b09124

Cited by 21 publications

(36 citation statements)

References 53 publications

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“…Isolated metallic nanoparticles (NPs) produce large local field enhancements via the excitation of localised plasmons, and can efficiently radiate energy to the far-field. Plasmonic nanoantennas are usually composed of two or more tightly coupled metallic nanostructures and can * a.demetriadou@bham.ac.uk concentrate electromagnetic fields to even smaller nanoscale 'hot-spots', enhancing the light intensity by at least three orders of magnitude [1,2,3,4,5,6,7]. During the last few years, there have been tremendous advancements in the fabrication of plasmonic nanoantennas, with gaps reaching just few (or even sub) nanometers-often referred to as plasmonic nanocavities [8,9,10].…”

Section: Introductionmentioning

confidence: 99%

On the Excitation and Radiative Decay Rates of Plasmonic Nanoantennas

Bedingfield,

Demetriadou

2022

Preprint

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Plasmonic nanoantennas have the ability to confine and enhance incident electromagnetic fields into very sub-wavelength volumes, while at the same time efficiently radiating energy to the far-field. These properties have allowed plasmonic nanoantennas to be extensively used for exciting quantum emitters-such as molecules and quantum dots-and also for the extraction of photons from them for measurements in the far-field. Due to electromagnetic reciprocity, it is expected that plasmonic nanoantennas radiate energy as efficiently as an external source can couple energy to them. In this paper, we adopt a multipole expansion (Mie theory) and numerical simulations to show that although reciprocity holds, certain plasmonic antennas radiate energy much more efficiently than one can couple energy into them. This work paves the way towards designing plasmonic antennas with specific properties for applications where the near-to-far-field relationship is of high significance, such as: surface-enhanced Raman spectroscopy, strong coupling at room temperature, and the engineering of quantum states in nanoplasmonic devices.

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Section: Introductionmentioning

confidence: 99%

On the Excitation and Radiative Decay Rates of Plasmonic Nanoantennas

Bedingfield,

Demetriadou

2022

Preprint

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“…The effect of the influence of metallic nanostructures on the emission characteristics of nearby emitters have been observed in a variety of different molecules and quantum dots 3 , 14 – 28 . In particular, in ref.…”

Section: Introductionmentioning

confidence: 99%

Plasmon induced modification of silicon nanocrystals photoluminescence in presence of gold nanostripes

Dyakov

Жигунов

Marinins

et al. 2018

Sci Rep

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We report on the results of theoretical and experimental studies of photoluminescense of silicon nanocrystals in the proximity to plasmonic modes of different types. In the studied samples, the type of plasmonic mode is determined by the filling ratio of a one-dimensional array of gold stripes which covers the thin film with silicon nanocrystals on a quartz substrate. We analyze the extinction, photoluminesce spectra and decay kinetics of silicon nanocrystals and show that the incident and emitted light is coupled to the corresponding plasmonic mode. We demonstrate the modification of the extinction and photoluminesce spectra under the transition from wide to narrow gold stripes. The experimental extinction and photoluminescense spectra are in good agreement with theoretical calculations performed by the rigorous coupled wave analysis. We study the contribution of individual silicon nanocrystals to the overall photoluminescense intensity, depending on their spacial position inside the structure.

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“…All these works also shared the proposal that the PL enhancement was due to effects of localized surface plasmon resonance (LSPR) [ 16 , 17 , 18 , 20 ]. Therefore, they have motivated the development of other plasmonic coupled systems with enhanced PL, such as core-shell-type SiQDs-based nanocomposites consisting of a Au nanoparticle (NP) core and a thick shell of SiQDs agglomerates [ 21 ], a structure where SiQDs are placed in a gap between a gold thin film and an Au nanoparticle [ 22 ]. Or finally, a structure composed of a monolayer of luminescent SiQDs and a silver (Ag) film over nanosphere (AgFON) plasmonic structure, separated with a polymer spacer [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electroluminescence from Silicon Quantum Dots Embedded in Silicon Nitride Thin Films Coupled with Gold Nanoparticles in Light Emitting Devices

2018

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Nowadays, the use of plasmonic metal layers to improve the photonic emission characteristics of several semiconductor quantum dots is a booming tool. In this work, we report the use of silicon quantum dots (SiQDs) embedded in a silicon nitride thin film coupled with an ultra-thin gold film (AuNPs) to fabricate light emitting devices. We used the remote plasma enhanced chemical vapor deposition technique (RPECVD) in order to grow two types of silicon nitride thin films. One with an almost stoichiometric composition, acting as non-radiative spacer; the other one, with a silicon excess in its chemical composition, which causes the formation of silicon quantum dots imbibed in the silicon nitride thin film. The ultra-thin gold film was deposited by the direct current (DC)-sputtering technique, and an aluminum doped zinc oxide thin film (AZO) which was deposited by means of ultrasonic spray pyrolysis, plays the role of the ohmic metal-like electrode. We found that there is a maximum electroluminescence (EL) enhancement when the appropriate AuNPs-spacer-SiQDs configuration is used. This EL is achieved at a moderate turn-on voltage of 11 V, and the EL enhancement is around four times bigger than the photoluminescence (PL) enhancement of the same AuNPs-spacer-SiQDs configuration. From our experimental results, we surmise that EL enhancement may indeed be due to a plasmonic coupling. This kind of silicon-based LEDs has the potential for technology transfer.

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Fluorescence Enhancement and Spectral Shaping of Silicon Quantum Dot Monolayer by Plasmonic Gap Resonances

Cited by 21 publications

References 53 publications

On the Excitation and Radiative Decay Rates of Plasmonic Nanoantennas

On the Excitation and Radiative Decay Rates of Plasmonic Nanoantennas

Plasmon induced modification of silicon nanocrystals photoluminescence in presence of gold nanostripes

Enhanced Electroluminescence from Silicon Quantum Dots Embedded in Silicon Nitride Thin Films Coupled with Gold Nanoparticles in Light Emitting Devices

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