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--- fdtd:broadband [2018/09/25 09:33]
pklapetek created
+++ fdtd:broadband [2018/09/25 10:19]
pklapetek
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----- Broadband calculations ----
+===== Broadband calculations =====
 In many examples the calculation is run for a single wavelength, eg. 633 nm. This is fine if we want to study monochromatic light interaction with some structure. However, in many cases a spectral dependence of some quantity is needed.
@@ Line 9: / Line 9: @@
 Broadband calculations in FDTD are based on use of a broadband excitation, so instead of feeding our source with a sine function we use something with wider spectrum, like Gaussian function. Then we analyze the results using Fourier transform to get the spectral dependence.
+An example that can be used to benchmark such calculation can be the reflection on a thick gold metal layer, that should give the results comparable to literature values.
+{{ :samples:broadband.png?500 |}}
+----
+//
+{{ :samples:img_broadband.png?100|}}
+Sample parameter file: {{samples:broadband.tar.gz|broadband calculation}}.
+\\
+A thin stripe of material with periodic boundary conditions to simulate reflection on a metallic material using broadband excitation. Results of calculation are in rpoint_broadband_fft.txt (FFT processed values at point above the gold layer) and xspectrum.txt (source spectral dependence).
+//
+----

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