Hi all, I am using meep to calculate the wavelength/frequency dependent transmission or loss down a hollow core Bragg fiber (as described in the online book Photonic crystals: molding the flow of light). I have been able to replicate all figures in the book using cylindrical coordinates. Now, I want to calculate the transmission down a fiber - specifically one with low refractive index contrast (1.33 vs. 1.55) and low number of crystal repeat units (< 7). I calculate the transmission using two flux planes - one closer to the source normalized by one farther away down the fiber. I currently do not consider that the materials absorb because I want to first examine radiating loss from the photonic crystal structure. I am trying to get to a point where I can adjust the refractive indices and the photonic crystal dimensions to compare fiber transmission/loss for the different scenarios. We are interested in visible wavelengths which and the frequency range accordingly. The current parameters in the attached ctl file should guide approximately 600 nm light (f=1.67 meep units where a = 1 micron).
As I understand it, I should place the first flux plane far enough away from the source to consider primarily guided frequencies. I see large differences in the transmission (and sometimes greater than 1) when I change things like the flux plane position from source and size as well as whether the source is a point or a plane. I have attempted to optimize the pml layer thickness and the resolution. My current questions are: 1. Am I modeling transmission down a bragg fiber correctly? 2. Should I use a point or plane source? 3. How far from the source should I put the first flux plane such that I primarily look at guided frequencies? I am currently looking at 2 microns from the source which is more than 2X the guided wavelength. 4. Should the flux planes be the size of the "hollow core", the full fiber or larger? Thanks in advance for your advice, Amanda
cwgtrans.ctl
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Amanda Holt, Ph.D. | Postdoctoral Scholar University of Pennsylvania, Philadelphia Department of Physics and Astronomy alh...@physics.upenn.edu | 831.359.9822 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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