On Wed, 28 Nov 2007, [EMAIL PROTECTED] wrote: > I want to simulate the electric field distribution in a hollow core > photonic crystal fiber with meep. The core diameter is 5.1 micron. Pitch > (distance between cladding hole centers) is 1.77 micron. Center > operating wavelength is 630nm. I try to simulate the hollow core and > cladding holes with cylinders. But the result is not good. The electric > field is rather strong outside of the cladding holes. So no band gap > around 630nm has been formed. > > I think the reason may be the shape of the cladding holes which are not > cylindrical but hexagonal. But I don't know how to define a hexagonal > structure. Could you please help me? If you can provide some codes, that > will be better. Thank you very much!
Whether the holes are hexagonal or cylindrical, you will still have band gaps. In general, photonic band gaps rarely depend strongly on small geometric details of that sort (although of course you can optimize the size of the gap a bit by tweaking such details). Probably you are making some conceptual mistake in your simulation, although I'm not sure what you mean exactly by "simulate the hollow core". For example, in a photonic crystal fiber there is no complete gap, there is only a gap at a particular propagation constant (beta, or k_z). If you excite the fiber with a current source at one end, you will excite all propagation constants at that frequency, including modes both inside and outside the gap. Regards, Steven G. Johnson _______________________________________________ meep-discuss mailing list [email protected] http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
