2008/11/7 Cai Huang <[EMAIL PROTECTED]>
> Dear Steven and meep users, > > > > The material type class in meep reference shows the latest meep supports > the property B-conductivity-diag [vector3], which is the diagonal elements > of "B-conductivity tensor", but it is out of hand in meep. > > > > The problem is how to set the off-diagonal elements of "B-conductivity > tensor" in meep. So I define a new class medium as follows: > > > > ; define a new class medium > > (define-class medium material-type > > (define-property epsilon no-default 'number) > > (define-property mu no-default 'number) > > (define-property mu-tensor (matrix3x3 (vector3 1 0 0) > (vector3 0 1 0) > > (vector3 0 0 1)) 'matrix3x3) > > (define-derived-property scaled-mu-tensor 'matrix3x3 > > (lambda (object) > > (matrix3x3* (object-property-value > object 'mu) > > (object-property-value object > 'mu-tensor)))) > > > > And I have used the above class medium to simulate an example in meep > tutorial named "A 90°bend" ( > http://ab-initio.mit.edu/wiki/index.php/Meep_Tutorial#A_90.C2.B0_bend), at > the same time I substituted "(material (make dielectric (epsilon 12)))" to > "(material Medium0)" in the ctl source code, which is in the attachment. > > > But keeping the diagonal elements of "B-conductivity tensor" unchanged, the > result of the simulation is the same one to all kinds of off-diagonal > elements. In fact the results show the off-diagonal elements of > "B-conductivity tensor" defined in medium don't effect at all. > > > > So, did I make any mistake or should I take some other methods to resolve > the problem? Thanks ahead! > > > > Regards, > > > Huang
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