3D orthogonality relations for the surface waves and the far field evaluation in viscoelastic layered solids with or without fluid loading

2009 ◽  
pp. 237-249
Author(s):  
D. D. Zakharov
Keyword(s):  
Surface Waves ◽  
Field Evaluation ◽  
Far Field ◽  
Fluid Loading ◽  
Orthogonality Relations

scholarly journals Structural and Acoustic Responses of a Submerged Stiffened Conical Shell

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Meixia Chen ◽  
Cong Zhang ◽  
Xiangfan Tao ◽  
Naiqi Deng
Keyword(s):  
Conical Shell ◽  
Element Model ◽  
Analytical Models ◽  
Superposition Method ◽  
Far Field ◽  
Fluid Loading ◽  
Low Frequencies ◽  
Structural Responses ◽  
The Individual ◽  
Field Sound

This paper studies the vibrational behavior and far-field sound radiation of a submerged stiffened conical shell at low frequencies. The solution for the dynamic response of the conical shell is presented in the form of a power series. A smeared approach is used to model the ring stiffeners. Fluid loading is taken into account by dividing the conical shell into narrow strips which are considered to be local cylindrical shells. The far-field sound pressure is solved by the Element Radiation Superposition Method. Excitations in two directions are considered to simulate the loading on the surface of the conical shell. These excitations are applied along the generator and normal to the surface of the conical shell. The contributions from the individual circumferential modes on the structural responses of the conical shell are studied. The effects of the external fluid loading and stiffeners are discussed. The results from the analytical models are validated by numerical results from a fully coupled finite element/boundary element model.

Determination of geometric properties of SNOM tips by means of combined far-field and near-field evaluation

1999 ◽  
Author(s):  
Soenke Seebacher ◽  
Wolfgang Osten ◽  
Werner P. O. Jueptner ◽  
Vadim P. Veiko ◽  
Nikolay B. Voznesensky
Keyword(s):  
Near Field ◽  
Field Evaluation ◽  
Far Field ◽  
Geometric Properties

scholarly journals Helicity-delinked manipulations on surface waves and propagating waves by metasurfaces

Nanophotonics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 3473-3481 ◽  
Author(s):  
Shiqing Li ◽  
Zhuo Wang ◽  
Shaohua Dong ◽  
Sixiong Yi ◽  
Fuxin Guan ◽  
...  
Keyword(s):  
Surface Waves ◽  
Near Field ◽  
Far Field ◽  
Proof Of Concept ◽  
Circularly Polarized ◽  
Propagating Waves ◽  
Very High ◽  
Opposite Helicity

AbstractAlthough many approaches have been proposed to manipulate propagating waves (PWs) and surface waves (SWs), usually each operation needs a separate meta-device, being unfavorable for optical integrations. Here, we propose a scheme to design a single meta-device that can efficiently generate SWs and/or PWs with pre-designed wavefronts, under the excitations of circularly polarized (CP) PWs with different helicity. As a proof of concept, we design and fabricate a microwave meta-device and experimentally demonstrate that it can convert incident CP waves of opposite helicity to SWs possessing different wavefronts and traveling to opposite directions, both exhibiting very high efficiencies. We further generalize our scheme to design a meta-device and numerically demonstrate that it can either excite a SW beam with tailored wavefront or generate a far-field PW with pre-designed wavefront, as shined by CP waves with different helicity. Our work opens the door to achieving simultaneous controls on far- and near-field electromagnetic environments based on a single ultra-compact platform.

Inspection of nano-sized SNOM-tips by optical far-field evaluation

2001 ◽  
Vol 36 (5) ◽  
pp. 451-473 ◽  
Author(s):  
S. Seebacher ◽  
W. Osten ◽  
V.P. Veiko ◽  
N.B. Voznessenski
Keyword(s):  
Field Evaluation ◽  
Far Field
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