File:Phase-shift illustration.png
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Phase-shift_illustration.png (485 × 485 pixels, file size: 5 KB, MIME type: image/png)
Summary
| Description | Illustration of en:phase-shift masks |
| Date | (UTC) |
| Source | Own work (Original text: self-made with MATLAB) |
| Author | Oleg Alexandrov |
Licensing
|
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
Source code (MATLAB)
% A very simple code to illustrate the phase-shift in a plane wave
% Things become much more complex if the effects of diffraction are
% included.
Lx=1;
Ly=0.4;
Mx = Lx/2;
Wy = Ly/2;
M=400;
N = floor(M*Ly/Lx);
[X, Y]=meshgrid(linspace(0, Lx, M), linspace(0, Ly, N));
k = 100; % the wavenumber
Z = real(exp(i*k*X));
% The field Z with a phase-shifted part
S = find ( X > Mx & Y < Ly/2 + Wy/2 & Y > Ly/2 - Wy/2);
W = Z;
W(S) = W(S)*exp(i*pi);
figure(1); clf; hold on; axis equal; axis off;
surf(X, Y, real(Z));
downshift = 1.5*Ly;
surf(X, Y-downshift, real(W));
view(0, 90);
shading flat;
colormap copper;
axis([0, Lx, -downshift, Ly]);
saveas(gcf, 'Phase-shift_illustration.eps', 'psc2');
|
This simple math image could be re-created using vector graphics as an SVG file. This has several advantages; see Commons:Media for cleanup for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with
{{vector version available|new image name}}.
It is recommended to name the SVG file “Phase-shift illustration.svg”—then the template Vector version available (or Vva) does not need the new image name parameter. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:26, 9 October 2007 | | 485 × 485 (5 KB) | wikimediacommons>Oleg Alexandrov | Rotate and flip to be consistent with another picture |
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