A comparison of the performance of finite difference time-domain, finite element time-domain, and discrete surface integral equation methods on high performance parallel computers

2002 ◽  
Author(s):  
S.D. Gedney
Keyword(s):  
Integral Equation ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
High Performance ◽  
Parallel Computers ◽  
Surface Integral ◽  
Surface Integral Equation ◽  
Integral Equation Methods ◽  
Discrete Surface ◽  
Difference Time

scholarly journals Optical Vortices Sharp Focusing by Silicon Ring Gratings Using High-Performance Computer Systems

2021 ◽  
Author(s):  
Dmitry Savelyev
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
High Performance ◽  
Light Propagation ◽  
Longitudinal Component ◽  
Laser Beams ◽  
Minimum Size ◽  
Sharp Focusing ◽  
Direction Of Polarization ◽  
Difference Time

The diffraction of vortex laser beams with circular polarization (with different direction of polarization rotation) by silicon ring gratings was investigated in this paper. The silicon diffractive axicons with different numerical apertures (NA) were considered as such ring gratings. The considered diffractive axicons are compared with single silicon circular protrusion (cylinder). The finite difference time domain method was used for Light propagation (3D) through the proposed silicon ring gratings and silicon cylinder. The possibility of subwavelength focusing by varying the height of the elements is demonstrated. In particular, it is numerically shown that a silicon cylinder forms a light spot with the minimum size (intensity) of the longitudinal component of the electric field FWHM is 0.32λ.

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