On Mar 11, 2008, at 3:03 PM, andika asyuda wrote:
I have question about the unit of frequency
Now, I am doing my final assignment about photonic crystal 2D. I am
just not sure about the unit of frequency. In my work, I try model
photonic crystal with lattice constant 300 nm and source with
frequency 5.3 * 10^14 Hz. How to define this value of frequency in
meep? Is there any consideration about length scale?
A typical thing would be to choose units "a" of distance where a =
300nm. That is, all distance are expressed as ratios to lattice
constant. Then the angular frequency omega in Meep is given in units
of 2*pi*c/a, which is equivalent to specifying a/lambda where lambda
is the vacuum wavelength (lambda = 566nm in your case) ... that is,
for 5.3e14 Hz you would specify frequency in Meep as 300/566 = 0.53.
See also the section on units in the Meep introduction.
Regards,
Steven G. Johnson
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