You can use farfiled projection and check if there are larger angles than the beam divergence, which are the side lobes due to diffraction. FOr a test, if you use larger waveguide core than the beam width, the diffraction will be less. Typical examples from our studies of pulsed‐beam self‐focusing, the scattering of a pulsed‐beam from a linear‐nonlinear interface, and pulsed‐beam propagation in nonlinear waveguides will be discussed. When a Gaussian beam meets non-uniform material/structure, it creates diffraction. The NL‐FDTD approach and its application to the modeling of the interaction of an ultrashort, optical pulsed Gaussian beam with a Kerr nonlinear material will be described. Typical examples from our studies of pulsed‐beam self‐focusing, the scattering of a pulsed‐beam from a linear‐nonlinear interface, and pulsed‐beam propagation in nonlinear waveguides will be discussed.ĪB - In an effort to meet an ever increasing demand for more accurate and realistic integrated photonics simulations, we have developed a multidimensional, nonlinear finite difference time domain (NL‐FDTD) Maxwell's equations solver. N2 - In an effort to meet an ever increasing demand for more accurate and realistic integrated photonics simulations, we have developed a multidimensional, nonlinear finite difference time domain (NL‐FDTD) Maxwell's equations solver. T2 - Self‐focusing and linear‐nonlinear interfaces The red solid lines show the diffracting case, the dashed white lines correspond to the initial section of the. Typical examples from our studies of pulsedbeam selffocusing, the scattering of a pulsedbeam from a linearnonlinear interface, and pulsedbeam propagation in. In this paper, the phase characteristics for a continuous wave (CW) Gaussian beam propagating through a NRI slab is studied via FDTD simulations, in which both the normal and oblique beam incidences are considered. The NLFDTD approach and its application to the modeling of the interaction of an ultrashort, optical pulsed Gaussian beam with a Kerr nonlinear material will be described. The beam is modeled using a non-paraxial approximation (vector beam approximation) which assumes that the fields in the. Alternatively, the FDTD method provides a more accurate approach to the study of subwavelength focusing of NRIMs. A Gaussian source defines a beam of electromagnetic radiation propagating in a specific direction, with the amplitude defined by a Gaussian cross-section of a given width. Birefringence n is 0.001, 0.01, 0.2, and 0.4, from the top to bottom row, respectively. Gaussian beam source (DGTD) - Simulation object.
![fdtd gaussian beam fdtd gaussian beam](https://media.springernature.com/m685/springer-static/image/art%3A10.1038%2Fs41598-020-76225-9/MediaObjects/41598_2020_76225_Fig1_HTML.png)
The beam is linearly polarized along x (left column) and y (right column). T1 - Applications of the nonlinear finite difference time domain (NL‐FDTD) method to pulse propagation in nonlinear media FDTD simulations versus birefringence for a fixed profile.