In this section, we introduce one of the most universal numerical methods in optics and electromagnetism – the finite-difference time-domain (FDTD) method. Its universality is a consequence of the method target: the FDTD method is aimed to solve directly Maxwell’s equations (2.2) through (2.5) without any further approximations and derivations. Thus, all processes governed by Maxwell’s equations can in principle be described numerically by FDTD solvers, which are often referred to as a brutal force. Of course, in reality, there is a great deal of particular situations, where FDTD methods can be non-practical due to mesh constrains or processing time limitations, that is, in fibre ...
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