Three-Dimensional Full-Wave Optical Simulation of LEDs

2010 ◽  
Author(s):  
Martin Loeser ◽  
Beat Ruhstaller
Keyword(s):  
Three Dimensional ◽  
Optical Simulation ◽  
Full Wave

Multifunctional metasurfaces integrating near-field display and 3D holography

2021 ◽  
Author(s):  
Wenjuan Du ◽  
Zhilang Lou ◽  
Xuesong Chen ◽  
Long Chen ◽  
Dongliang Tang
Keyword(s):  
Near Field ◽  
Three Dimensional ◽  
Optical Field ◽  
Amplitude Control ◽  
3D Images ◽  
Full Wave ◽  
Complex Functions ◽  
Channel Information ◽  
Amplitude Modulator ◽  
Optical Applications

Abstract Metasurfaces have versatile manipulation capabilities in the optical field and provide the possibility of building a compact optical device with various complex functions. They have been regarded as ideal candidates to construct a miniaturized optical system with high density and multi-channel information. In this work, reflective all-metallic multifunctional metasurfaces consisting of aluminum nanorods are designed by simultaneously realizing the near-filed display and three-dimensional (3D) holography. Specifically, in the proposed design, each nanorod acts as a complex amplitude modulator to provide continuous amplitude control and binary phase control. By carefully optimizing the orientations of nanorods, a multifunctional metasurface can be designed to display a near-field grayscale pattern and far-field 3D images simultaneously. Numerical results by a full-wave simulation validate the good performance of the proposed design. The proposed method could provide more degree of freedom to designs of lightweight devices, which could be employed in optical applications, such as the virtual or augmented reality display and anti-counterfeit technology.

Study on the influence of the magnetic field geometry on the power deposition in a helicon plasma source

2019 ◽  
Vol 85 (4) ◽  
Author(s):  
M. Magarotto ◽  
D. Melazzi ◽  
D. Pavarin
Keyword(s):  
Magnetic Field ◽  
Power Spectrum ◽  
Three Dimensional ◽  
Plasma Source ◽  
Magnetostatic Field ◽  
Helicon Plasma ◽  
Power Deposition ◽  
Full Wave ◽  
Field Geometry ◽  
Helicon Source

We have numerically studied how an actual confinement magnetostatic field affects power deposition in a helicon source. We have solved the wave propagation by means of two electromagnetic solvers, namely: (i) plaSma Padova Inhomogeneous Radial Electromagnetic solver (SPIREs), a mono-dimensional finite-difference frequency-domain code, and (ii) Advanced coDe for Anisotropic Media and ANTennas (ADAMANT), a full-wave three-dimensional tool based on the method of moments. We have computed the deposited power spectrum with SPIREs, power deposition profile with ADAMANT and the antenna impedance with both codes. First we have verified the numerical accuracy of both SPIREs and ADAMNT. Then, we have analysed two configurations of magnetostatic field, namely produced by Maxwell coils, and Helmholtz coils. For each configuration we have studied three cases: (i) low density $n=10^{17}~\text{m}^{-3}$ and low magnetic field $B_{0}=250$  G; (ii) medium density $n=10^{18}~\text{m}^{-3}$ and medium magnetic field $B_{0}=500$  G; (iii) high density $n=10^{19}~\text{m}^{-3}$ and high magnetic field $B_{0}=1000$  G. We have found that the Maxwell coil configuration does not produces significant changes in the deposited power phenomenon with respect to a perfectly uniform and axial magnetostatic field. While the Helmholtz coil configuration can lead to a power spectrum peaked near the axis of the discharge.

Homogeneous Material Constructed Acoustic Cloak Based on Coordinate Transformation

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Tinghua Li ◽  
Ming Huang ◽  
Jingjing Yang ◽  
Yaozhong Lan ◽  
Jing Sun
Keyword(s):  
Coordinate Transformation ◽  
Mass Density ◽  
Three Dimensional ◽  
Transformation Method ◽  
Homogeneous Material ◽  
Spatial Transformation ◽  
Practical Realization ◽  
Full Wave ◽  
Coordinate Transformation Method ◽  
Important Progress

The two-dimensional and three-dimensional acoustic cloaks composed of homogeneous and nonsingular materials are designed by choosing appropriate spatial transformation. The mass density tensor and bulk modulus of the acoustic cloaks with diamond shape are derived, and extended to an acoustic carpet cloak. Performance of the acoustic cloaks is confirmed by full-wave simulation. The work represents an important progress towards the practical realization of the metamaterial-assisted acoustic cloak and expands the application of the coordinate transformation method.

An Advanced SAR Simulator of Three-Dimensional Structures Combining Geometrical Optics and Full-Wave Electromagnetic Methods

2014 ◽  
Vol 52 (1) ◽  
pp. 776-784 ◽  
Author(s):  
Krzysztof S. Kulpa ◽  
Piotr Samczynski ◽  
Mateusz Malanowski ◽  
Artur Gromek ◽  
Damian Gromek ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Geometrical Optics ◽  
Full Wave ◽  
Electromagnetic Methods

scholarly journals Three‐dimensional imaging of steeply dipping structure near the San Andreas fault, Parkfield, California

Geophysics ◽  
1988 ◽  
Vol 53 (2) ◽  
pp. 176-185 ◽  
Author(s):  
John N. Louie ◽  
Robert W. Clayton ◽  
Ronan J. LeBras
Keyword(s):  
Seismic Reflection ◽  
San Andreas Fault ◽  
Three Dimensional ◽  
Summation Method ◽  
Ultramafic Rocks ◽  
Back Projection ◽  
Lateral Velocity ◽  
Full Wave ◽  
San Andreas ◽  
Vertical Fault

Shot gathers from the Parkfield, California, deep crustal seismic reflection line, recorded in 1977 by COCORP, reveal coherent events having horizontal to reverse moveouts. These events were migrated using a multioffset three‐dimensional Kirchhoff summation method. This method is a ray‐equation back projection inversion of the acoustic wave field, which is valid under the Born, WKBJ, and far‐field assumptions. Migration of full‐wave acoustic synthetics, having the same limitations in geometric coverage as the COCORP survey, demonstrates the utility of the imaging process. The images obtained from back projection of the survey data suggest that the Gold Hill fault carries ultramafic rocks from the surface to 3 km depth at a dip greater than 45 degrees, where it joins the San Andreas fault, which may cut through more homogeneous materials at shallow depths. To the southwest, a 2 km Tertiary sedimentary section appears to terminate against a near‐vertical fault. The zone between this fault and the San Andreas may be floored at 3 km by flat‐lying ultramafics. Lateral velocity inhomogeneities are not accounted for in the migration but, in this case, do not seriously hinder the reconstruction of reflectors.

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