- #1
daudaudaudau
- 302
- 0
Hi.
In electromagnetics, a material(linear,isotropic,homogenous) with constitutive parameters [tex]\epsilon[/tex] and [tex]\mu[/tex] has the wavenumber [tex]k^2=\omega^2\epsilon\mu[/tex]. Consequently [tex]k=\pm\omega\sqrt{\epsilon\mu}[/tex]. Does this mean that [tex]\omega[/tex] can actually be negative, and if so, when is it the case? It seems strange to me, but some guy told me today that a negative wavenumber was indeed possible.
In electromagnetics, a material(linear,isotropic,homogenous) with constitutive parameters [tex]\epsilon[/tex] and [tex]\mu[/tex] has the wavenumber [tex]k^2=\omega^2\epsilon\mu[/tex]. Consequently [tex]k=\pm\omega\sqrt{\epsilon\mu}[/tex]. Does this mean that [tex]\omega[/tex] can actually be negative, and if so, when is it the case? It seems strange to me, but some guy told me today that a negative wavenumber was indeed possible.