[Meep-discuss] Gaissian Distribution of Phase
Dear Steven and meep users, I already saw some examples of oblique source by introducing a phase shift in source function. Is it possible to construct a focused source by Gaussian distribution of phase ? If yes, can anybody give an example please. Regards, Yousuf Khan___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] h5topng with material as gold
Hi dear meep users, I am using the following (given below) material property for GOLD as define in notes on metals in meep. All goes well but I can see the field distribution in png file. It appers very dark. I have tried different color schemes in h5topng command but unable to fix it. Also looked up in discussion forum and didn't find anything working so far. Can anyone suggest how to deal with this problem ? (define myAg (make dielectric (epsilon 1) (polarizations (make polarizability (omega 1e-20) (gamma 0.038715) (sigma 4.4625e+41)) (make polarizability (omega 0.65815) (gamma 3.1343) (sigma 7.9247)) (make polarizability (omega 3.6142) (gamma 0.36456) (sigma 0.50133)) (make polarizability (omega 6.6017) (gamma 0.052426) (sigma 0.013329)) (make polarizability (omega 7.3259) (gamma 0.7388) (sigma 0.82655)) (make polarizability (omega 16.365) (gamma 1.9511) (sigma 1.1133)) ))) Regards, Yousuf Khan___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] Phase Plotting
Dear meep users, I am calculating reflection phase of a plane wave source by tilting it. I am following the previous discussion about the reflection phase calculation mentioned below: https://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg00849.html But when I draw the normilized frequency (X-axis) v.s phase (Y-axis) in matlab, I dont get the phase scale. It varies from -200 to 600. Can anybody help how can I chage it to pi units, degrees or wavelength unit ? I am plotting using the following method suggested by Steven G. Johnson N = length(R); Rangle = phase(fft(R - R0)); Rangle = Rangle(1:N/2); % frequencies above Nyquist are redundant freq = [0:length(Rangle)-1] / (N * dt); plot(freq, Rangle) Regards, Yousuf Khan___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] Units while Plotting Reflection Phase
Dear meep users, I am calculating reflection phase of a plane wave source by tilting it. I am following the previous discussion about the reflection phase calculation mentioned below: https://www.mail-archive.com/meep-discuss@ab-initio.mit.edu/msg00849.html But when I draw the normilized frequency (X-axis) v.s phase (Y-axis) in matlab, I dont get the phase scale. It varies from -200 to 600. Can anybody help how can I chage it to pi units, degrees or wavelength unit ? I am plotting using the following method suggested by Steven G. Johnson N = length(R); Rangle = phase(fft(R - R0)); Rangle = Rangle(1:N/2); % frequencies above Nyquist are redundant freq = [0:length(Rangle)-1] / (N * dt); plot(freq, Rangle) Regards, Yousuf Khan Institute of Nanostructure Technologies and Analytics (INA) Technological Electronics - University of Kassel ___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] Check for imagianray number
Hi dear Steven and meep users, I want to convert imaginary output to a real number or zero in meep. For example checking in a loop if x is imaginary set it to zero I tired if complex? x conditon but it is not working. Can anybody help or suggest how to write the code for it. Regards, Yousuf Khan___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] Numerical Erros while keeping the source inside the material
Hello dear meep users, I am simulating an optical fiber structure having a grating layer on its tip. A circular source is placed inside the core and transmissiom and reflection flux is measured above and below the grating layer on the tip of fiber. In this senario, transmission monitor layer is placed in the air just above the grating and reflection monitir layer is placed inside the core and cladding just below the grating layer. The refrective indices of the structures are core: 1.468, cladding: 1.4613, grating layer: 2.134. If i simulate just the grating suspended in the air, the transmission and reflection spectra are symmetric. While if i include core and cladding transmission spectrum remains the same but reflection sprectrum show strange graph. It ossicilates between -3 to 0.2 reflection values instead of staying in between 0 and 1. Can any body suggest what is the problem. The ctl file is attached. Regards, Yousuf Khan fibertip.ctl Description: Binary data ___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
[Meep-discuss] Numerical Erros while keeping the source inside the material
Hello dear meep users, I am simulating an optical fiber structure having a grating layer on its tip. A circular source is placed inside the core and transmissiom and reflection flux is measured above and below the grating layer on the tip of fiber. In this senario, transmission monitor layer is placed in the air just above the grating and reflection monitir layer is placed inside the core and cladding just below the grating layer. The refrective indices of the structures are core: 1.468, cladding: 1.4613, grating layer: 2.134. If i simulate just the grating suspended in the air, the transmission and reflection spectra are symmetric. While if i include core and cladding transmission spectrum remains the same but reflection sprectrum show strange graph. It ossicilates between -3 to 0.2 reflection values instead of staying in between 0 and 1. Can any body suggest what is the problem. __ |_| PML | | air | | |---| -- |---| Trans monitor layer |==|== = =| = = |= = = |==| Grating layer |---|-|--|--- |---| Refl monitor layer | | |core| | | | | clad |___ | | | Source |__|__ |___ |_|__| |_| PML Regards, Yousuf Khan___ meep-discuss mailing list meep-discuss@ab-initio.mit.edu http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/meep-discuss
