Dear all, I created a periodic structure 2D in meep of Aurum in air and I want to study the spectum to the variation of the inclination of the source. I use a gaussian source and I apply it a tilted of x degree using amp function to source. I use the k-point that it depends to theta by the following relation:
(define theta (/ (* pi theta_deg) 180)) (define kx (* fcen (sin theta))) (set! ensure-periodicity true) (set! k-point (vector3 kx 0 0)) Gaussian source has the following parametres: wavelength=0.6 (it is normalized to 1 micrometer), FWHM=2.5. The monitor that compute fft has central frequency of 1.75 and FWHM=1.5 (0.4-1 range). Increasing source inclination angle, there are many abnormal oslillations of spectrum wieving by monitor. The problen is correlated whith the fact that the source is gaussian and the effective tilte that meep consider is given by the next relation: asin(lambda0/lambda*sin(theta_simulated)). How I can remove these undesired oscillations whithout to use, in another simulation, a source with another wavelength and combine pieces of spectrum. Thanks all, Ruggiero
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