Hallo Simon,
Simon J. Bale schrieb: > Dear all, > > I'm interested in using meep to model the resonant frequencies and > field patterns inside a high Q cylindrical cavity resonator in 3 > dimensions. I'm totally new to meep and I've had a read through the > tutorial and documentation and I'm concerned that I may not be able to > accurately model the metal end wall and side wall losses. Is it > possible to specify a lossy metal over a wide bandwidth in meep and if > so are there any examples? In principle you can model any material behaviour over a wide bandwith as shown on the meep website : http://ab-initio.mit.edu/wiki/index.php/Dielectric_materials_in_Meep Metals are normally modeled with a Drude model where omega_n is zero. Here is an example of a gold model which is valid from 600nm to 1600nm wavelength: ;material model for Gold ;valid from lam=1.6um to lam=0.6um with max 4% in Realpart and 10% in Imagpart (define gold (make dielectric (epsilon 9.166006) (polarizations (make polarizability (omega 1e-20) (gamma 0.0570080) (delta-epsilon 52.255807e40)) (make polarizability (omega 1.650112) (gamma 0.0623894) (delta-epsilon 0.0683452)) ) ) ) > > I'm also interested in modelling the quality factor of some very high > Q distributed Bragg structures but again metal loss is important. Will > meep be a suitable fit for this type of problem? In principle meep is suitable for this type of calculation. However when modeling metals one has to choose a very high resolution to get accurate results, because of the small decay length of the wave inside the metal. Because of this you usually need a computer with much memory or a cluster even for small problems. > > Best Regards, Simon. Best regards, Andreas _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
