There is a sqrt(epsilon1)+sqrt(epsilon2) there, how does that arise? How does that expression boil down to the quater wave? > Message: 1 > Date: Thu, 24 May 2007 12:45:18 -0400 > From: nate lipkowitz <[EMAIL PROTECTED]> > Subject: Re: [MPB-discuss] Quarter Wave Thickness. > To: [email protected] > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1; > DelSp="Yes"; > format="flowed" > > 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] > > > > ------------------------------ > > Message: 2 > Date: Thu, 24 May 2007 23:24:10 -0400 > From: "Jim Andrews" <[EMAIL PROTECTED]> > Subject: [MPB-discuss] E-field plots > To: [email protected] > Message-ID: > > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1; > format=flowed > > Hello Steven et al, > I am trying to work through the defect1dsol.ctl > example that is posted > on the nanophotonics course website in order to > recreate the figure 4 > that appears there and I am finding that I don't > know how to get a > line plot of Ez from the h5 files. I'm having > trouble even getting > the condition satisfied that the frequency of one of > the bands is > within the range of the minimum and maximum > frequencies of the > structure without the defect. Also, I'm not sure > why the minimum and > maximum frequencies are defined by use of the > following because I > don't know what car and cadr mean here (though I can > see that this > gives the frequencies previously found for the two > band case: > (define gap-min (car freqs)) > (define gap-max (cadr freqs)) > > Any advice (hints as to where to look in the > documentation?) would be > appreciated. Thanks. > Jim Andrews > > -- > James H. Andrews > Dept. of Physics & Astronomy > Youngstown State University > > > > ------------------------------ > > _______________________________________________ > mpb-discuss mailing list > [email protected] > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss > > End of mpb-discuss Digest, Vol 15, Issue 11 > ******************************************* >
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