Comment on "Rigorous solution for transient propagation of electromagnetic waves through a medium: causality plus diffraction in time".
In a previous Letter [Opt. Lett. 25, 995 (2000)], Xiao claimed to have found a "rigorous solution for transient propagation of electromagnetic waves through a medium." We show that Xiao's results apply strictly only to vacuum, which serves as a reference medium in classical electromagnetics.
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Weiglhofer
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Lakhtakia