scholarly journals Near-field optical effect of a core-shell nanostructure in proximity to a flat surface

2014 ◽  
Vol 140 (4) ◽  
pp. 044109 ◽  
Author(s):  
Wenping Cui ◽  
Mingda Li ◽  
Zuyang Dai ◽  
Qingping Meng ◽  
Yimei Zhu
Keyword(s):  
Flat Surface ◽  
Near Field ◽  
Core Shell ◽  
Optical Effect

scholarly journals Publisher’s Note: “Near-field optical effect of a core-shell nanostructure in proximity to a flat surface” [J. Chem. Phys. 140, 044109 (2014)]

2015 ◽  
Vol 143 (19) ◽  
pp. 199901
Author(s):  
Wenping Cui ◽  
Mingda Li ◽  
Zuyang Dai ◽  
Qingping Meng ◽  
Yimei Zhu
Keyword(s):  
Flat Surface ◽  
Near Field ◽  
Chem Phys ◽  
Core Shell ◽  
Optical Effect

A proposed wavy shield for suppression of supersonic jet noise utilizing reflections

2021 ◽  
Vol 20 (1-2) ◽  
pp. 4-34
Author(s):  
Reda R Mankbadi ◽  
Saman Salehian
Keyword(s):  
Large Scale ◽  
Flat Surface ◽  
Near Field ◽  
Supersonic Jet ◽  
Jet Noise ◽  
Dominant Frequency ◽  
Wavy Surface ◽  
Initial Region ◽  
Reflected Waves ◽  
Free Jet

In this work we propose replacing the conventional flat-surface airframe that shields the engine by a wavy surface. The basic principle is to design a wavy pattern to reflect the incoming near-field flow and acoustic perturbations into waves of a particular dominant frequency. The reflected waves will then excite the corresponding frequency of the large-scale structure in the initial region of the jet’s shear layer. By designing the frequency of the reflected waves to be the harmonic of the fundamental frequency that corresponds to the radiated peak noise, the two frequency-modes interact nonlinearly. With the appropriate phase difference, the harmonic dampens the fundamental as it extracts energy from it to amplify. The outcome is a reduction in the peak noise. To evaluate this concept, we conducted Detached Eddy Simulations for a rectangular supersonic jet with and without the wavy shield and verified our numerical results with experimental data for a free jet, as well as, for a jet with an adjacent flat surface. Results show that the proposed wavy surface reduces the jet noise as compared to that of the corresponding flat surface by as much as 4 dB.

Jet deposition in near-field electrospinning of patterned polycaprolactone and sugar-polycaprolactone core–shell fibres

Polymer ◽  
2011 ◽  
Vol 52 (16) ◽  
pp. 3603-3610 ◽  
Author(s):  
Feng-Lei Zhou ◽  
Penny L. Hubbard ◽  
Stephen J. Eichhorn ◽  
Geoffrey J.M. Parker
Keyword(s):  
Near Field ◽  
Core Shell

scholarly journals Towards rational design and optimization of near-field enhancement and spectral tunability of hybrid core-shell plasmonic nanoprobes

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Debadrita Paria ◽  
Chi Zhang ◽  
Ishan Barman
Keyword(s):  
Single Molecule ◽  
Rational Design ◽  
Near Infrared ◽  
Theoretical Calculations ◽  
Near Field ◽  
Field Enhancement ◽  
Infrared Region ◽  
Core Shell ◽  
Optimization Strategy ◽  
Design And Optimization

Abstract In biology, sensing is a major driver of discovery. A principal challenge is to create a palette of probes that offer near single-molecule sensitivity and simultaneously enable multiplexed sensing and imaging in the “tissue-transparent” near-infrared region. Surface-enhanced Raman scattering and metal-enhanced fluorescence have shown substantial promise in addressing this need. Here, we theorize a rational design and optimization strategy to generate nanostructured probes that combine distinct plasmonic materials sandwiching a dielectric layer in a multilayer core shell configuration. The lower energy resonance peak in this multi-resonant construct is found to be highly tunable from visible to the near-IR region. Such a configuration also allows substantially higher near-field enhancement, compared to a classical core-shell nanoparticle that possesses a single metallic shell, by exploiting the differential coupling between the two core-shell interfaces. Combining such structures in a dimer configuration, which remains largely unexplored at this time, offers significant opportunities not only for near-field enhancement but also for multiplexed sensing via the (otherwise unavailable) higher order resonance modes. Together, these theoretical calculations open the door for employing such hybrid multi-layered structures, which combine facile spectral tunability with ultrahigh sensitivity, for biomolecular sensing.

scholarly journals Laser-written colours on silver: optical effect of alumina coating

Nanophotonics ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 807-822 ◽  
Author(s):  
Jean-Michel Guay ◽  
Antonino Calà Lesina ◽  
Graham Killaire ◽  
Peter G. Gordon ◽  
Choloong Hahn ◽  
...  
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Flat Surface ◽  
Atomic Layer ◽  
Alumina Coating ◽  
Optical Effect ◽  
Alumina Film ◽  
Flat Surfaces ◽  
Layer Deposition ◽  
Difference Time

AbstractIn this paper we discuss the optical response of laser-written plasmonic colours on silver coated via the atomic layer deposition of alumina. These colours are due to nanoparticles distributed on a flat surface and on a surface with periodic topographical features (i.e. ripples). The colours are observed to shift with increasing alumina film thickness. The colours produced by surfaces with ripples recover their original vibrancy and hue after the deposition of film of thickness ~60 nm, while colours arising from flat surfaces gradually fade and never recover. Analysis of the surfaces identifies periodic topographical features to be responsible for this behaviour. Finite-difference time-domain simulations unravel the role played by the alumina thickness in colour formation and confirm the rotations and recovery of colours for increasing alumina thickness. The coloured surfaces were evaluated for applications in colourimetric and radiometric sensing showing large sensitivities of up to 3.06/nm and 3.19 nm/nm, respectively. The colourimetric and radiometric sensitivities are observed to be colour dependent.

scholarly journals 3D-Conformer of Tris[60]fullerenylated cis-Tris(diphenylamino-fluorene) as Photoswitchable Charge-Polarizer on GHz-Responsive Trilayered Core-Shell Dielectric Nanoparticles

Molecules ◽  
2018 ◽  
Vol 23 (8) ◽  
pp. 1873 ◽  
Author(s):  
He Yin ◽  
Min Wang ◽  
Tzuyang Yu ◽  
Loon-Seng Tan ◽  
Long Chiang
Keyword(s):  
Near Field ◽  
Resonance Energy ◽  
Gold Surface ◽  
Fullerene Cage ◽  
Core Shell ◽  
White Led ◽  
Plasmonic Resonance ◽  
Binding Interaction ◽  
Surface Distribution ◽  
Subsequent Formation

Novel 3D-configurated stereoisomers cis-cup-tris[C60>(DPAF-C9)] and trans-chair-tris[C60>(DPAF-C9)] were designed and synthesized in good yields. The former, with three C60> cages per molecule facing at the same side of the geometrical molecular cup-shape, was proposed to provide excellent binding interaction forces at the gold surface of core-shell γ-FeOx@AuNP nanoparticles and to direct the subsequent formation of a fullerene cage array (defined as fullerosome). Upon photoactivation of the Au-layer and cis-cup-tris[C60>(DPAF-C9)] itself, the degree of photoinduced intramolecular e−-transfer from DPAF to a C60> moiety was found to be largely enhanced by the accumulated plasmonic resonance energy at the near-field surface. Distribution of resulting negative charges along the outer (C60>)-derived fullerosome shell layer of the trilayered NPs was correlated with the detected photoswitchable dielectric amplification phenomena using white LED light at 1.0 GHz.

Theoretical studies on the near field properties of non-concentric core–shell nanoparticle dimers

2010 ◽  
Vol 283 (14) ◽  
pp. 2947-2952 ◽  
Author(s):  
Binfeng Yun ◽  
Zhuyuan Wang ◽  
Guohua Hu ◽  
Yiping Cui
Keyword(s):  
Near Field ◽  
Core Shell ◽  
Theoretical Studies

Near-Field Radiative Heat Transfer Between Mie Resonance-Based Metamaterials Made of Coated Nonmagnetic Particles

2019 ◽  
Author(s):  
Lu Lu ◽  
Jinlin Song ◽  
Kun Zhou ◽  
Qiang Cheng
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Liquid Crystals ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Nematic Liquid Crystals ◽  
Near Field ◽  
Core Shell ◽  
Mie Resonance ◽  
Shell Particles

Abstract Near-field radiative heat transfer between Mie resonance-based metamaterials composed of SiC/d-Si (silicon carbide and doped silicon) core/shell particles immersed in aligned nematic liquid crystals are numerically investigated. The metamaterials composed of core/shell particles exhibit superior performances of enhanced heat transfer and obvious modulation effect when compared to that without shell. The underlying mechanism can be explained that the excitation of Fröhlich mode and epsilon-near-zero (ENZ) resonances both contribute to the total heat flux. Modulation of near-field radiative heat transfer can be realized with the host material of aligned nematic liquid crystals. The largest modulation ratio could be achieved as high as 0.45 for metamaterials composed of core/shell SiC/d-Si particles, and the corresponding heat flux is higher than other similar materials such as LiTaO3/GaSb and Ge/LiTaO3. While with the same volume filling fraction, the modulation ratio of that composed of SiC particles is only 0.2. We show that the core/shell nanoparticles dispersed liquid crystals (NDLCs) have a great potential in enhancing the near-field radiative heat transfer in both the p and s polarizations with the radii of 0.65 μm, and Mie-metamaterials are shown for the first time to modulate heat flux within sub-milliseconds.

Near-field analysis of CdSe quantum dot conjugated core-shell nanoparticle

2014 ◽  
Author(s):  
Taehwang Son ◽  
Saji Thomas Kochuveedu ◽  
Dong Ha Kim ◽  
Donghyun Kim
Keyword(s):  
Quantum Dot ◽  
Near Field ◽  
Field Analysis ◽  
Core Shell ◽  
Cdse Quantum Dot
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