We derive the instantaneous densities of electric energy and electric power dissipation in lossless and lossy dispersive media for a time-harmonic electric field. The instantaneous quantities are decomposed into DC and AC components, some of which are shown to be independent of the dispersion of dielectric constants. The AC component of the instantaneous energy density can be used to visualize propagation of electromagnetic waves through complex 3D structures.
© 2012 Optical Society of America
Original Manuscript: November 14, 2011
Revised Manuscript: December 26, 2011
Manuscript Accepted: December 27, 2011
Published: April 24, 2012
Wonseok Shin, Aaswath Raman, and Shanhui Fan, "Instantaneous electric energy and electric power dissipation in dispersive media," J. Opt. Soc. Am. B 29, 1048-1054 (2012)