refractive index is defined as the ratio of the phase velocity in a medium to the phase velocity in vacuum. this means surfaces of constant phase move more slowly in a high-index medium than vacuum, and consequently the distance over which some amount of phase advance (in this case, pi/4) happens. so, the physical length of a quarter of a wavelength is scaled by a factor of n.
Raman S <[EMAIL PROTECTED]> wrote: > In the following the quarter wave thickness seems to > the be the fraction of the lower refractive index to > the total refractive index. > Why/how is this related to the quarter wave > Why does this wave maxmize the band gap. BEcause the > reflection leading to destructive interference is > maximized at this quarter wave thickness. But how is > the above formula related to the quarter of the > wavelength? > Thanks much. > VR Sitaraman > > ; We'll make the default d1 equal to the quarter-wave > thickness. You > ; can change that by changing this line, or even > easier, by running: > ; mpb d1=0.3 bandgap1d.ctl > ; or whatever. (define-param is a command to define > parameters that > ; can be varied from the command line like this.) > (define-param d1 (/ (sqrt eps2) (+ (sqrt eps1) (sqrt > eps2)))) > (define d2 (- 1 d1)) > > > > > ____________________________________________________________________________________ > Food fight? Enjoy some healthy debate > in the Yahoo! Answers Food & Drink Q&A. > http://answers.yahoo.com/dir/?link=list&sid=396545367 > > _______________________________________________ > mpb-discuss mailing list > [email protected] > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= nate lipkowitz 416 823 8057 [EMAIL PROTECTED] _______________________________________________ mpb-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss
