Physics – Quantum Physics
Scientific paper
1997-11-14
Superlattices Microstruct. 23 (1998) 781
Physics
Quantum Physics
Scientific paper
10.1006/spmi.1997.0540
We investigate the time evolution of waves in evanescent media generated by a source within this medium and observed at some distance away from the location of the source. The aim is to find a velocity which describes a causal process and is thus, for a medium with relativistic dispersion, limited by the velocity of light. The wave function consists of a broad frequency forerunner generated by the onset of the source, and of a monochromatic front which carries the oscillation frequency of the source. For a medium with Schr\"{o}dinger-like dispersion the monochromatic front propagates with a velocity which is in agreement with the traversal time, and in the relativistic case the velocity of the fronts is limited by the velocity of light. For sources with a sharp onset, the forerunners are not attenuated and in magnitude far exceed the monochromatic front. In contrast, for sources which are frequency-band limited, the forerunners are also attenuated and become comparable to the monochromatic front: like in the propagating case, there exists a time at which a broad frequency forerunner is augmented by a monochromatic wave.
Buttiker Markus
Thomas Helmuth
No associations
LandOfFree
Front Propagation in Evanescent Media does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Front Propagation in Evanescent Media, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Front Propagation in Evanescent Media will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-281811