In a previous Letter [Opt. Lett. <b>25,</b> 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.
© 2001 Optical Society of America
Werner S. Weiglhofer and Akhlesh Lakhtakia, "Comment on “Rigorous solution for transient propagation of electromagnetic waves through a medium: causality plus diffraction in time”," Opt. Lett. 26, 1218-1219 (2001)