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Birifrangence_k-surface.gif (360 × 368 pixels, file size: 1.19 MB, MIME type: image/gif, looped, 64 frames)

Summary

Description
English: In a birefringent crystal, at each frequency and direction correspond two possible values of the wavenumber, as the surface of allowed k-vectors has two sheets. For some special directions these two values are degenerate (optic axes).
Date
Source https://twitter.com/j_bertolotti/status/1194199575562739712
Author Jacopo Bertolotti
Permission
(Reusing this file)
https://twitter.com/j_bertolotti/status/1030470604418428929

Mathematica 11.0 code

f = \[Omega]^2 c^2 e1 e2 e3 (\[Omega]^4 c^4 - \[Omega]^2 c^2 ((kx^2 + ky^2)/e3 + (kx^2 + kz^2)/e2 + (ky^2 + kz^2) e1) + (kx^2/(e2 e3) + ky^2/(e1 e3) + kz^2/(e1 e2)) (kx^2 + 
         ky^2 + kz^2)) /. {c -> 1, e1 -> 1, e2 -> 2, e3 -> 3, \[Omega] -> 1};
p1 = Table[
   Show[
    ContourPlot3D[{f == 0}, {kx, -2, 2}, {ky, -2, 2}, {kz, -2, 2}, ContourStyle -> Directive[Opacity[0.5], Orange], AxesLabel -> {"\!\(\*SubscriptBox[\(k\), \(x\)]\)", "\!\(\*SubscriptBox[\(k\), \(y\)]\)", 
       "\!\(\*SubscriptBox[\(k\), \(z\)]\)"}, Mesh -> None, Ticks -> None, LabelStyle -> {Bold, Black}, RegionFunction -> Function[{kx, ky, kz}, kx < a], BoxRatios -> {1, 1, 1}]
    ,
    Graphics3D[{Black, Thick, Line[{2*{-1.24, 0, -0.68}, 2*{1.24, 0, 0.68}}], Line[{2*{-1.24, 0, 0.68}, 2*{1.24, 0, -0.68}}]}]
    ]
   , {a, 1.8, 1.24, -0.05}];
p2 = Show[
   ContourPlot3D[{f == 0}, {kx, -2, 2}, {ky, -2, 2}, {kz, -2, 2}, ContourStyle -> Directive[Opacity[0.5], Orange], AxesLabel -> {"\!\(\*SubscriptBox[\(k\), \(x\)]\)", "\!\(\*SubscriptBox[\(k\), \(y\)]\)", 
      "\!\(\*SubscriptBox[\(k\), \(z\)]\)"}, Mesh -> None, Ticks -> None, LabelStyle -> {Bold, Black}, RegionFunction -> Function[{kx, ky, kz}, kx < 1.24], BoxRatios -> {1, 1, 1}]
   ,
   Graphics3D[{Black, Thick, Line[{2*{-1.24, 0, -0.68}, 2*{1.24, 0, 0.68}}], Line[{2*{-1.24, 0, 0.68}, 2*{1.24, 0, -0.68}}]}]
   ];
p3 = Table[
   Show[
    ContourPlot3D[{f == 0}, {kx, -2, 2}, {ky, -2, 2}, {kz, -2, 2}, ContourStyle -> Directive[Opacity[0.5], Orange], AxesLabel -> {"\!\(\*SubscriptBox[\(k\), \(x\)]\)", "\!\(\*SubscriptBox[\(k\), \(y\)]\)", 
       "\!\(\*SubscriptBox[\(k\), \(z\)]\)"}, Mesh -> None, Ticks -> None, LabelStyle -> {Bold, Black}, RegionFunction -> Function[{kx, ky, kz}, kx < a], BoxRatios -> {1, 1, 1}]
    ,
    Graphics3D[{Black, Thick, Line[{2*{-1.24, 0, -0.68}, 2*{1.24, 0, 0.68}}], Line[{2*{-1.24, 0, 0.68}, 2*{1.24, 0, -0.68}}]}]
    ]
   , {a, 1.24, 0.5, -0.05}];
ListAnimate[
 Join[p1, Table[p2, 5], p3, Reverse[p3], Table[p2, 5], Reverse[p1] ] ]

Licensing

I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

Captions

Surface of the allowed k-vectors at a fixed frequency for a biaxial crystal.

12 November 2019

image/gif

244966cdc451307414260caf0c6cd585c1c60de8

1,246,746 byte

368 pixel

360 pixel

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Date/TimeThumbnailDimensionsUserComment
current10:20, 14 November 2019Thumbnail for version as of 10:20, 14 November 2019360 × 368 (1.19 MB)BertoUser created page with UploadWizard

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