Dear MEEP users and Steven, The trick of developing oblique incidence source is a powerful technique, which I used for my research to model the interaction of dark-field scattering microscopy. As the formulation uses the central frequency, it leads to the dispersion of angles when a broadband Gaussian source is used.
As discussed in the previous post by Steven( http://www.mail-archive.com/[email protected]/msg00692.html), the angles corresponding to frequencies other than the central frequency can be calculated by theta = arcsin(k / omega), where k the x-component of the wavevector. However, there is a chance that the source is so broad that k/omega will be greater than 1 at small frequency edge of the pulse. Will this lead to an artifact on the spectrum, or other possibilities? For my application, the system response for the electric field is considered to be linear, hence, the angle problem can be solved: I can safely decompose the electric field to two principle components and multiple a correction factor (which can be calculated based on the angle of k) to recalibrate the spectrum to a fixed angle. But the above question obsessed me about the correctness of the implementation. Regards, Mike
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