---------- Forwarded message ---------- From: maryam saberi <[EMAIL PROTECTED]> Date: Nov 14, 2007 2:15 PM Subject: Re: [MPB-discuss] question To: nate lipkowitz <[EMAIL PROTECTED]>
Hi Thank you very much for your help. I also want to simulate a core-shell fcc structure ( core with dielectric constant epsilon1 + shell with dielectric constant epsilon2) by mpb, but I don't know how to define dielectric constant of spheres(core+shell). I think that I should use of a Step Function, but I can't define it in program. In addition, how can I define and run the program along a special direction, for example [1 1 1]. On 11/13/07, nate lipkowitz <[EMAIL PROTECTED]> wrote: > hi, this is what i use. as steven notes in the manual (which you > should have read) the fcc unit cell has an edge length of sqrt(2) > times the diameter of your spheres, so you need to take that factor > into account if you convert the freqs output by mpb to real frequency > units. > > anyway here is the ctl file.. cheers: > > > (set! num-bands 10) > (set! default-material (make dielectric (index 3.9))) > (set! resolution 16) > (set! mesh-size 5) > > > > (set! geometry-lattice > (make lattice > (basis1 0 1 1) > (basis2 1 0 1) > (basis3 1 1 0) > (basis-size (sqrt 0.5) (sqrt 0.5) (sqrt 0.5)) > (size 1 1 1) > ) > ) > > (set! geometry > (list > (make sphere > (center 0 0 0) > (radius (/ (sqrt 0.5) 2)) > (material > (make dielectric > (index 1.0) > ) > ) > ) > ) > ) > > > (set! k-points > (interpolate 4 > (list > (vector3 0 0.5 0.5) ; X > (vector3 0 0.625 0.375) ; U > (vector3 0 0.5 0) ; L > (vector3 0 0 0) ; Gamma > (vector3 0 0.5 0.5) ; X > (vector3 0.25 0.75 0.5) ; W > (vector3 0.375 0.75 0.375) ; K > ) > ) > ) > > (run) > > > > > maryam saberi <[EMAIL PROTECTED]> wrote: > > > Hello > > I' d like simulate a fcc inverse opal structure with Mit Photonic Bands > > package, but I don't know how to write it's program. > > Please help me. > > thanks > > > > > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > nate lipkowitz > 416 823 8057 > [EMAIL PROTECTED] > > _______________________________________________ > mpb-discuss mailing list > [email protected] > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss > _______________________________________________ mpb-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/mpb-discuss
