Two-Resonance Phase Index Dispersion
No Causal Negative Signal Refraction
Main Results of our paper:
Our paper in Physical Review Letters V. 88, 18, p. 187401 May 6 2000,
proves that, contrary to prevalent belief,
media with negative phase refractive index (see top fig. on left)
do not lead to negative refraction of wave signals or energy
(see bottom fig. on left).
Why we use the name NIM: Negative Index Media, rather than
the currently used name LHM: Left Handed Media:
- We show that
negative refarction of any
physical wave signal
(i.e., a wave of non-zero frequency width)
would violate two basic laws of physics -
that no signal can travel faster than light,
and that causality must be obeyed.
- Our basic argument negates all other
LHM papers and
potential applications (pefrect lens
because they are all
based on the presumed validity of negative wave refraction.
- Wave dispersion is always critical when dealing with NIMs.
One must not use
strictly monochromatic waves
to approximate even slowly varying
because this approximation is
always wrong in NIM.
Since this goes contrary to everyone's familiarity with
using monochromatic waves for PIMs, this is an important lesson.
- In order to avoid confusion with
circular polarizing left-handed (chiral) media, which have been
known from the time of Louis Pasteur.
- LHM are in fact symmetric under reflection, so they are
neither left-handed nor right handed media.
- The original use of LHM was to denote that the electromagnetic
fields and propagation vectors of a wave form a left-handed system
in these media. However, the physically meaningful Poynting vector
is still right-handed.