Accurate dipole modeling of forces on a metallic nanoparticle with a larger radius than skin depth

Nanotechnology is the most sought field in biomedical research. Metallic nanoparticles have wide applications in the medical field and have gained the attention of various researchers for advanced research for their application in pharmaceutical field. A variety of metallic nanoparticles like gold, silver, platinum, palladium, copper and zinc have been developed so far. There are different methods to synthesize metallic nanoparticles like chemical, physical, and green synthesis methods. Chemical and physical approaches suffer from certain drawbacks whereas green synthesis is emerging as a nontoxic and eco-friendly approach in production of metallic nanoparticles. Green synthesis is further divided into different approaches like synthesis via bacteria, fungi, algae, and plants. These approaches have their own advantages and disadvantages. In this article, we have described various metallic nanoparticles, different modes of green synthesis and brief description about different metabolites present in plant that act as reducing agents in green synthesis of metallic nanoparticles.

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Surface plasmon polariton–enhanced photoluminescence of monolayer MoS2 on suspended periodic metallic structures

Nanophotonics ◽

10.1515/nanoph-2020-0545 ◽

2020 ◽

Vol 10 (2) ◽

pp. 975-982

Author(s):

Huanhuan Su ◽

Shan Wu ◽

Yuhan Yang ◽

Qing Leng ◽

Lei Huang ◽

...

Keyword(s):

Surface Plasmon ◽

Surface Plasmon Polariton ◽

Plasmonic Nanostructures ◽

Metallic Nanoparticle ◽

Systematic Analysis ◽

Excitation Rate ◽

Matter Interaction ◽

Light Matter Interaction ◽

Plasmon Polariton ◽

Plasmonic Effects

AbstractPlasmonic nanostructures have garnered tremendous interest in enhanced light–matter interaction because of their unique capability of extreme field confinement in nanoscale, especially beneficial for boosting the photoluminescence (PL) signals of weak light–matter interaction materials such as transition metal dichalcogenides atomic crystals. Here we report the surface plasmon polariton (SPP)-assisted PL enhancement of MoS2 monolayer via a suspended periodic metallic (SPM) structure. Without involving metallic nanoparticle–based plasmonic geometries, the SPM structure can enable more than two orders of magnitude PL enhancement. Systematic analysis unravels the underlying physics of the pronounced enhancement to two primary plasmonic effects: concentrated local field of SPP enabled excitation rate increment (45.2) as well as the quantum yield amplification (5.4 times) by the SPM nanostructure, overwhelming most of the nanoparticle-based geometries reported thus far. Our results provide a powerful way to boost two-dimensional exciton emission by plasmonic effects which may shed light on the on-chip photonic integration of 2D materials.

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Quantifying photoinduced carriers transport in exciton–polariton coupling of MoS2 monolayers

npj 2D Materials and Applications ◽

10.1038/s41699-021-00227-y ◽

2021 ◽

Vol 5 (1) ◽

Author(s):

Min-Wen Yu ◽

Satoshi Ishii ◽

Shisheng Li ◽

Ji-Ren Ku ◽

Jhen-Hong Yang ◽

...

Keyword(s):

Electronic Energy ◽

Plasmonic Nanostructures ◽

Transition Metal Dichalcogenide ◽

Metallic Nanoparticle ◽

Rabi Splitting ◽

One Dimensional ◽

Induced Dipole ◽

Mos2 Monolayers ◽

Plasmon Polaritons ◽

Significant Attention

AbstractExciton–polariton coupling between transition metal dichalcogenide (TMD) monolayer and plasmonic nanostructures generates additional states that are rich in physics, gaining significant attention in recent years. In exciton–polariton coupling, the understanding of electronic-energy exchange in Rabi splitting is critical. The typical structures that have been adopted to study the coupling are “TMD monolayers embedded in a metallic-nanoparticle-on-mirror (NPoM) system.” However, the exciton orientations are not parallel to the induced dipole direction of the NPoM system, which leads to inefficient coupling. Our proposed one-dimensional plasmonic nanogrooves (NGs) can align the MoS2 monolayers’ exciton orientation and plasmon polaritons in parallel, which addresses the aforementioned issue. In addition, we clearly reveal the maximum surface potential (SP) change on intermediate coupled sample by the photo-excitation caused by the carrier rearrangement. As a result, a significant Rabi splitting (65 meV) at room temperature is demonstrated. Furthermore, we attribute the photoluminescence enhancement to the parallel exciton–polariton interactions.

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Comparison of Screening Configurations for the Mitigation of Voltages and Currents Induced on Pipelines by HVAC Power Lines

Energies ◽

10.3390/en14133855 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3855

Author(s):

Arturo Popoli ◽

Leonardo Sandrolini ◽

Andrea Cristofolini

Keyword(s):

Finite Element Analysis ◽

Cross Sections ◽

Detrimental Effect ◽

Power Line ◽

Skin Depth ◽

Power Lines ◽

Element Analysis ◽

3D Finite Element ◽

Different Shapes ◽

High Magnetic Permeability

In this paper, a strategy for reducing the electromagnetic interferences induced by power lines on metallic pipelines is proposed and numerically investigated. The study considers a set of steel conductors interposed between the power line and the pipeline. Different shapes of conductor cross sections and different magnetic permeabilities are considered, to identify the solution exhibiting the greatest mitigation efficiency for the same amount of material. The investigation is carried out by means of a quasi-3D finite element analysis. Results show that the main mechanism responsible for the mitigation is constituted by the currents induced in the screening conductors by the power line. Hence, a high magnetic permeability can have a detrimental effect since it reduces the skin depth to values below the size of the screening conductor. In this case, a reduction of the screening current and in the mitigation efficiency is observed. Nevertheless, the study shows that the use of strip-shaped screening conductors allows the employment of cheaper magnetic materials without compromising the mitigation efficacy of the screening conductors.

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Microwave Hall effect measurement for materials in the skin depth region

Journal of Applied Physics ◽

10.1063/5.0033777 ◽

2021 ◽

Vol 129 (1) ◽

pp. 015102

Author(s):

Ryo Ogawa ◽

Tatsunori Okada ◽

Hideyuki Takahashi ◽

Fuyuki Nabeshima ◽

Atsutaka Maeda

Keyword(s):

Hall Effect ◽

Hall Effect Measurement ◽

Skin Depth ◽

Effect Measurement

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Design Improvements in Multi-sectional HFCG using Time-varying Skin Depth

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1033/1/012029 ◽

2021 ◽

Vol 1033 ◽

pp. 012029

Author(s):

Rajat Gautam ◽

Saurabh Chanana

Keyword(s):

Skin Depth ◽

Time Varying

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Theoretical studies of excitation dynamics in a peridinin-chlorophyll-protein coupled to a metallic nanoparticle

Open Physics ◽

10.2478/s11534-011-0003-x ◽

2011 ◽

Vol 9 (2) ◽

Cited By ~ 5

Author(s):

Mikolaj Schmidt ◽

Sebastian Mackowski

Keyword(s):

Energy Transfer ◽

Metallic Surface ◽

Energy Transfer Rate ◽

Metallic Nanoparticle ◽

Light Harvesting Complex ◽

Radiative Processes ◽

Förster Energy Transfer ◽

Chlorophyll Protein ◽

Induced Changes ◽

Excitation Dynamics

AbstractIn this work we study the influence of plasmon excitations on the excitation dynamics within a protein complex embedding two chlorophyll molecules coupled to a gold nanosphere. Small separation between the chlorophylls and metallic nanoparticle allows us to simplify the calculations of the Förster energy transfer rate and non-radiative processes by replacing a spherical nanoparticle with a metallic surface. Our results show modifications of all relevant processes and the energy transfer pathways within the system as well as the radiative processes. Plasmon induced changes result in strong qualitative effects of the fluorescence of the studied light-harvesting complex.

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