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the 2.5 d variational fdtd also called the var fdtd solver works by collapsing a 3d geometry to 2d and runs a 2d fdtv simulation which is much faster and uses less memory compared to a 3dftd simulation the method used to reduce the 3d problem to an effective 2d problem will be discussed in the solver physics section of the course because the solver is based on the fdtd method and many of the settings and workflow for using the solver are shared with fdtd solutions we will not be covering the shared features in detail in this course and the fdtd100 course is a recommended prerequisite as mentioned the advantage of the var fdtd solver is that it allows us to simulate 3d devices using a 2d fdtd simulation this is useful for simulating relatively large devices where the dimensions of the device are hundreds of times larger than the wavelength and for prototyping designs where you need to run many simulations to sweep the parameters of the design since this will greatly speed up the process
