Dear meep users & Dr. Johnson
Definition of Gaussian beam source was asked in the forum page and description was given as the following. http://thread.gmane.org/gmane.comp.science.electromagnetism.meep.general/77/focus=78 " Just provide an amplitude function (amp-func property) that gives the field amplitude as a function of space to make a Gaussian envelope. To tilt the beam, add an exp(ikx) phase. e.g. do: (define ((my-amp sigma k) x) (exp (- (* 0+2i pi (vector3-dot k x)) (/ (vector3-dot x x) (* 2 sigma sigma))))) and then create a source with (amp-func (my-amp s k)) where you pass it the desired width s and k-vector k. (Note that the syntax (define ((foo x) y) ...) defines a function (foo x) that returns a function of y.)" Gaussian beam depend on the radial distance “r”. http://en.wikipedia.org/wiki/Gaussian_beam if 2D structure is taken (in x-y plane and propagation direction is taken along the x -axis ), r =y But I cannot see coordinate” y” in the amplitude function described above. What is the point I missed or thought wrong? best Onder
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