Is it possible to observe field pattern other than the excited frequency. One smple experiment I am exciting a 500 nm width, 30 nm height Si waveguide at 193.42 THz with numeric port (boundary mode analysis study), am giving 193.42 THz at frequency domain, say I want to observe the field patterns at 300 or 200 THz, that means it will appear blank (no field since excited at 193.42 THz) . I can only see te field patterns at the excited ones (mean by frequency entered in the frequency domain, i.e., the excited ones), despite of giving a parametric sweep at other frequencies. So how to observe field patterns at different frequency other than the excited frequency?
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