scholarly journals Theory of optical forces on small particles by multiple plane waves

2018 ◽  
Vol 124 (17) ◽  
pp. 173102 ◽  
Author(s):  
Ehsan Mobini ◽  
Aso Rahimzadegan ◽  
Carsten Rockstuhl ◽  
Rasoul Alaee
Keyword(s):  
Plane Waves ◽  
Optical Forces ◽  
Small Particles ◽  
Multiple Plane

scholarly journals Computing the T-matrix of a scattering object with multiple plane wave illuminations

2017 ◽  
Vol 8 ◽  
pp. 614-626 ◽  
Author(s):  
Martin Fruhnert ◽  
Ivan Fernandez-Corbaton ◽  
Vassilios Yannopapas ◽  
Carsten Rockstuhl
Keyword(s):  
Plane Waves ◽  
The Finite Element Method ◽  
Full Wave ◽  
Electric Dipoles ◽  
Complicated Object ◽  
T Matrix ◽  
Multiple Plane ◽  
Optical Nanostructures ◽  
Scattered Fields ◽  
Matrix Calculation

Given an arbitrarily complicated object, it is often difficult to say immediately how it interacts with a specific illumination. Optically small objects, e.g., spheres, can often be modeled as electric dipoles, but which multipole moments are excited for larger particles possessing a much more complicated shape? The T-matrix answers this question, as it contains the entire information about how an object interacts with any electromagnetic illumination. Moreover, a multitude of interesting properties can be derived from the T-matrix such as the scattering cross section for a specific illumination and information about symmetries of the object. Here, we present a method to calculate the T-matrix of an arbitrary object numerically, solely by illuminating it with multiple plane waves and analyzing the scattered fields. Calculating these fields is readily done by widely available tools. The finite element method is particularly advantageous, because it is fast and efficient. We demonstrate the T-matrix calculation at four examples of relevant optical nanostructures currently at the focus of research interest. We show the advantages of the method to obtain useful information, which is hard to access when relying solely on full wave solvers.

A surrogate model to assess the whole body SAR induced by multiple plane waves at 2.4 GHz

2011 ◽  
Vol 66 (7-8) ◽  
pp. 419-428 ◽  
Author(s):  
Thierry Kientega ◽  
Emmanuelle Conil ◽  
Abdelhamid Hadjem ◽  
Elodie Richalot ◽  
Azzedine Gati ◽  
...  
Keyword(s):  
Surrogate Model ◽  
Plane Waves ◽  
Whole Body ◽  
Multiple Plane

scholarly journals Efficient Two-Dimensional Direction Finding via Auxiliary-Variable Manifold Separation Technique for Arbitrary Array Structure

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Guang Hua ◽  
Jiu-Dong Wu ◽  
Xi-Cheng Zhu ◽  
Hou-Xing Zhou ◽  
Wei Hong
Keyword(s):  
Plane Waves ◽  
Auxiliary Variable ◽  
Separation Technique ◽  
Eigenvalue Decomposition ◽  
Two Dimensional ◽  
Dimensional Parameter ◽  
Array Structure ◽  
Multiple Plane ◽  
Manifold Separation ◽  
Polynomial Rooting

A polynomial rooting direction of arrival (DOA) algorithm for multiple plane waves incident on an arbitrary array structure that combines the multipolynomial resultants and matrix computations is proposed in this paper. Firstly, a new auxiliary-variable manifold separation technique (AV-MST) is used to model the steering vector of arbitrary array structure as the product of a sampling matrix (dependent only on the array structure) and two Vandermonde-structured wavefield coefficient vectors (dependent on the wavefield). Then the propagator operator is calculated and used to form a system of bivariate polynomial equations. Finally, the automatically paired azimuth and elevation estimates are derived by polynomial rooting. The presented algorithm employs the concept of auxiliary-variable manifold separation technique which requires no sector by sector array interpolation and thus does not suffer from any mapping errors. In addition, the new algorithm does not need any eigenvalue decomposition of the covariance matrix and exhausted search over the two-dimensional parameter space. Moreover, the algorithm gives automatically paired estimates, thus avoiding the complex pairing procedure. Therefore, the proposed algorithm shows low computational complexity and high robustness performance. Simulation results are shown to validate the effectiveness of the proposed method.

2D space–time wave-digital multi-fan filter banks for signals consisting of multiple plane waves

2012 ◽  
Vol 25 (1) ◽  
pp. 17-39 ◽  
Author(s):  
Nilanka Rajapaksha ◽  
Arjuna Madanayake ◽  
Leonard T. Bruton
Keyword(s):  
Filter Banks ◽  
Plane Waves ◽  
Space Time ◽  
Multiple Plane ◽  
2D Space
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