![fdtd gaussian beam fdtd gaussian beam](https://d3i71xaburhd42.cloudfront.net/154f76458163bbdc68978f3eefb1a29c60101b1f/3-Figure3-1.png)
The resultant GBs are launched inside the system and tracked/traced using the GBT. If you try to inject this directly in FDTD (a rigorous technique), you may get some crazy results. I will warn you that the math describing a Gaussian light beam is derived using the paraxial approximation so it does not rigorously satisfy Maxwell's equations. The input to a system is rst expanded into a sum of Gaussian beams (GBs) using the Gabor expansion. Instead of a uniform amplitude and phase, your source will be Gaussian. frequency number The center frequency in units of /distance (or in units of 2 /distance). This method is a combination of Gaussian beam tracing (GBT), Gabor expansion, and the nite-difference time-domain method (FDTD). they are, but the difference between this and a true Gaussian is usually irrelevant. Technically, the 'Gaussian' sources in Meep are the (discrete-time) derivative of a Gaussian, i.e. Moreover, it is worth noting that our FDTD results are more accurate than the paraxial results in the case of a Gaussian beam propagating beyond the paraxial approximation. results presented for the interaction of a Gaussian beam with a linear thin lens. A Gaussian-pulse source roughly proportional to.
#Fdtd gaussian beam free#
For the normal incidence, all three contributions of the phase, i.e., plane-wave phase, radial phase and Guoy phase shift, have been shown to be the reverse of their counterparts in free space, which evidently reveals how phase compensation is caused by a NRI slab. MotivationTo implement a focused source distribution, namely a Gaussian beam, for scattering problems in FDTD.To eliminate the edge effectsTo investigate the.
![fdtd gaussian beam fdtd gaussian beam](https://www.mdpi.com/applsci/applsci-10-01945/article_deploy/html/images/applsci-10-01945-g005.png)
The phase and magnitude distributions for both the normal and oblique incidences of continuous wave Gaussian beams are presented. Moreover, it is worth noting that our FDTD results are more accurate than the paraxial results in the case of a Gaussian beam propagating beyond the paraxial approximation.ĪB - The phase characteristics of Gaussian beams in negative refractive index (NRI) slabs have been quantitatively investigated via the finite-difference time-domain (FDTD) method. Keywords: subwavelength focusing, linear gradient lense, FDTD, Gaussian beams.
![fdtd gaussian beam fdtd gaussian beam](https://d3i71xaburhd42.cloudfront.net/154f76458163bbdc68978f3eefb1a29c60101b1f/3-Figure2-1.png)
For the normal incidence, all three contributions of the phase, i.e., plane-wave phase, radial phase and Guoy phase shift, have been shown to be the reverse of their counterparts in free space, which evidently reveals how phase compensation is caused by a NRI slab. lens and a converging lens) for subwavelength focusing of Gaussian beams. N2 - The phase characteristics of Gaussian beams in negative refractive index (NRI) slabs have been quantitatively investigated via the finite-difference time-domain (FDTD) method. T1 - On the inverse phase characteristics of Gaussian beams in negative refractive index materials