scholarly journals Aspect-ratio driven evolution of high-order resonant modes and near-field distributions in localized surface phonon polariton nanostructures

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Chase T. Ellis ◽  
Joseph G. Tischler ◽  
Orest J. Glembocki ◽  
Francisco J. Bezares ◽  
Alexander J. Giles ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Near Field ◽  
High Order ◽  
Surface Phonon ◽  
Field Distributions ◽  
Resonant Modes ◽  
Surface Phonon Polariton

scholarly journals Near-field infrared nanospectroscopy of surface phonon-polariton resonances

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
P. McArdle ◽  
D. J. Lahneman ◽  
Amlan Biswas ◽  
F. Keilmann ◽  
M. M. Qazilbash
Keyword(s):  
Near Field ◽  
Surface Phonon ◽  
Surface Phonon Polariton

Nanoscale Thermal Radiation Between Coated Spheres

2017 ◽  
Author(s):  
Braden Czapla ◽  
Arvind Narayanaswamy
Keyword(s):  
Radiative Transfer ◽  
Thermal Radiation ◽  
Near Field ◽  
Reflection Coefficients ◽  
Far Field ◽  
Surface Phonon ◽  
Surface Phonon Polariton ◽  
Silver Spheres ◽  
New Formula ◽  
Coated Spheres

In this work, we present a new formula for the near-field thermal radiative transfer between two spheres. The formula is identical for coated or uncoated spheres and captures the effect of the coatings in the effective Mie reflection coefficients of the spheres. We also numerically demonstrate that silica coated silver spheres transition from silver-like conductance in the far-field to surface phonon polariton dominated silica-like behavior in the extreme near-field.

Transition Layer Effect on Thermal Radiative Near Field Mode Emission

2005 ◽  
Author(s):  
S. Ghassemi ◽  
J. S. Hammonds
Keyword(s):  
Near Field ◽  
Spectral Characteristics ◽  
Active Material ◽  
Film Surface ◽  
Radiative Properties ◽  
Impedance Boundary Condition ◽  
Impedance Boundary ◽  
Surface Modes ◽  
Surface Phonon ◽  
Surface Phonon Polariton

A spectrally selective thermally emitting device is proposed which takes advantage of near-field surface phonon polariton modes. Surface phonon polariton modes are usually restricted to the emitter surface and do not participate in energy exchange. In this work, the possibility of obtaining desirable spectral properties by using a thin-film surface active material, layered between dielectrics, is explored. This same multilayered structure is proposed to couple the surface modes into radiative modes that can participate in energy transport. This multilayer device is studied in this paper by developing the surface phonon mode dispersion relation to identify the spectral location of the surface modes. The fluctuation-dissipation theorem and impedance boundary condition is used to theoretically describe the near-field spectral radiative properties of the multilayer geometry. The near-field radiative properties show near monochromatic spectral characteristics due to the domination of surface phonon polariton modes.

Near-field imaging of mid-infrared surface phonon polariton propagation

2005 ◽  
Vol 87 (8) ◽  
pp. 081103 ◽  
Author(s):  
A. Huber ◽  
N. Ocelic ◽  
D. Kazantsev ◽  
R. Hillenbrand
Keyword(s):  
Near Field ◽  
Mid Infrared ◽  
Surface Phonon ◽  
Near Field Imaging ◽  
Surface Phonon Polariton ◽  
Field Imaging

Modulation of electromagnetic local density of states by coupling of surface phonon-polariton

2017 ◽  
Vol 31 (06) ◽  
pp. 1750050 ◽  
Author(s):  
Yao Li ◽  
Chao-Jie Zhang ◽  
Tong-Biao Wang ◽  
Jiang-Tao Liu ◽  
Tian-Bao Yu ◽  
...  
Keyword(s):  
Radiative Heat ◽  
Local Density ◽  
Near Field ◽  
Width Ratio ◽  
Local Density Of States ◽  
Density Of State ◽  
One Dimensional ◽  
Surface Phonon ◽  
Frequency Regime ◽  
Surface Phonon Polariton

We studied the electromagnetic local density of state (EM-LDOS) near the surface of a one-dimensional multilayer structure (1DMS) alternately stacked by SiC and Si. EM-LDOS of a semi-infinite bulk appears two intrinsic peaks due to the resonance of surface phonon-polariton (SPhP) in SiC. In contrast with that of SiC bulk, SPhP can exist at the interface of SiC and Si for the 1DMS. The SPhPs from different interfaces can couple together, which can lead to a significant modulation of EM-LDOS. When the component widths of 1DMS are large, the spectrum of EM-LDOS exhibits oscillation behavior in the frequency regime larger than the resonance frequency of SPhP. While the component widths are small, due to the strong coupling of SPhPs, another peak appears in the EM-LDOS spectrum besides the two intrinsic ones. And the position of the new peak move toward high frequency when the width ratio of SiC and Si increases. The influences of distance from the surfaces and period of 1DMS on EM-LDOS have also been studied in detail. The results are helpful in studying the near-field radiative heat transfer and spontaneous emission.

scholarly journals Influence of Tsunami Aspect Ratio on Near and Far-Field Tsunami Amplitude

Geosciences ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 178
Author(s):  
Natalia K. Sannikova ◽  
Harvey Segur ◽  
Diego Arcas
Keyword(s):  
Aspect Ratio ◽  
Near Field ◽  
Decay Rates ◽  
Far Field ◽  
Present Evidence ◽  
Positive Wave ◽  
Initial Wave ◽  
N Wave ◽  
Tsunami Amplitude ◽  
Wave Shapes

This study presents a numerical investigation of the source aspect ratio (AR) influence on tsunami decay characteristics with an emphasis in near and far-field differences for two initial wave shapes Pure Positive Wave and N-wave. It is shown that, when initial total energy for both tsunami types is kept the same, short-rupture tsunami with more concentrated energy are likely to be more destructive in the near-field, whereas long rupture tsunami are more dangerous in the far-field. The more elongated the source is, the stronger the directivity and the slower the amplitude decays in the intermediate- and far-fields. We present evidence of this behavior by comparing amplitude decay rates from idealized sources and showing their correlation with that observed in recent historical events of similar AR.

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