Dear Steven and Meep users, It has been several days since I have been able to post. Issues have accumulated.
1 - In my Meep model I am using a dielectric resonator made of Polyethylene, PE. High density PE has a dielectric constant = 2.3. across a broad range of frequencies. Do I use this value as the value of epsilon, as in (material (make dielectric (epsilon 2.3))) ? Or does it need to be scaled somehow into Meep units? If so, How is it scaled? 2 - I am using Copper, courtesy of Aaron Webster - http://fzu.cz/~dominecf/meep/data/meep-metals.pdf. The data Normalization length=1e-06 in meter. What does that mean to me specifically with respect to my lattice size and resolution? Also see 3, below. 3 - I am modeling a closed truncated copper cone resonator with very thin copper ends. A 2-D model. The general dimensions of the cone are 0.10 to 0.30 meter, the end thicknesses are 5e-5 meters and the drive frequency is 2 GHz. For low resolution h5topng does not show the ends but for high resolution (400) Meep does not execute succesfully for lattice sizes large enough to contain the device. I would like to use meep length a=1e-6 but that seems unapproachable. What am I missing in my understanding of scaling, lattice size and resolution? 4 - I have tried to use symmetry to speed the calculations. It does, but my cone does not maintain its shape. That is, this code ;(set! symmetries (list ; *********Symmetry***** ; (make rotate4-sym (direction 1) (phase (if xodd? -1 +1))) ; (make rotate2-sym (direction 2)) ; (make rotate4-sym (direction 1) ) ; (phase -1) defaults to +1 ; )) in all cases results in an h5topng image of my cone cut in the y-z plane with one end reversed and joined to the same end. Is this a Bug or again just my flawed understanding of the workings of symmetry in meep? 5 - I can run my model using cylindrical coordinates which speeds the calculations tremendously but I don't understand how to generate 2-D images for presentation. Is it possible? How? I hope this wish-list doesn't "turn you off." I will continue to search for answers and hope for answers to these questions, most likely one/two at at time. Thank you for your consideration and help. Stephen Russell _______________________________________________ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
