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;; generate a titled Gaussian beam profile by defining the amplitude function of the source
(set-param! resolution 40) ; pixels/μm
(set! geometry-lattice (make lattice (size 20 10 no-size)))
(set! pml-layers (list (make pml (thickness 1.0) (direction Y))))
(define-param fcen 1.0) ; center frequency of CW source (wavelength is 1 μm)
(define-param tilt-angle -10)
(set! tilt-angle (deg->rad tilt-angle))
(define k (vector3-scale fcen (rotate-vector3 (vector3 0 0 1) tilt-angle (vector3 0 1 0))))
(define-param beam-sigma 1.5) ; beam width
(define (gaussian-beam sigma k x0)
(lambda (x)
(exp (- (* 0+2i pi (vector3-dot k (vector3- x x0)))
(/ (vector3-dot (vector3- x x0) (vector3- x x0)) (* 2 sigma sigma))))))
(define src-pt (vector3 0 4 0))
(set! sources (list (make source
(src (make continuous-src (frequency fcen) (fwidth (* 0.2 fcen))))
(component Ez)
(center src-pt)
(size 20 0 0)
(amp-func (gaussian-beam beam-sigma k src-pt)))))
(run-until 50 (in-volume (volume (center 0 0 0) (size 20 8 0))
(at-end output-efield-z)))
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