File:Drexhage experiment.gif
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Drexhage_experiment.gif (576 × 245像素,文件大小:1.42 MB,MIME类型:image/gif、循环、61帧)
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摘要
| 描述Drexhage experiment.gif |
English: Schematic of the Drexhage experiment. Both the emission pattern and the total power emitted by a dipole depend on the distance from a mirror. This can be interpreted as an effect of the modified local density of states.
Italiano: Rappresentazione schematica dell'esperimento di Drexhage. Quando un dipolo si trova vicino a uno specchio la radiazione riflessa interferisce con quella emessa modificando sia la distribuzione angolare che la potenza totale emessa. Questo effetto ha un'interpretazione naturale in termini di densità degli stati vicino allo specchio. |
| 日期 | |
| 来源 | https://twitter.com/j_bertolotti/status/1150745727011905536 |
| 作者 | Jacopo Bertolotti |
| 授权 (二次使用本文件) |
https://twitter.com/j_bertolotti/status/1030470604418428929 |
Mathematica 11.0 code
\[Lambda] = 1;
k0 = (2 \[Pi])/\[Lambda];
G[r_] := I/4 HankelH1[0, k0 Norm[r] ];
s = Table[{h,(Abs[NIntegrate[G[{Cos[\[Theta]], Sin[\[Theta]]}] - G[{Cos[\[Theta]], Sin[\[Theta]]} - {2*h, 0}], {\[Theta], 0, 2 \[Pi]}] ]/s0)^2}, {h, 3, 0, -0.01}];
p1 = Table[
GraphicsRow[{
DensityPlot[Abs[G[{x, y}] - G[{x + 2*h, y}] ]^2, {x, -3, 7}, {y, -5, 5}, PlotPoints -> 100, Frame -> False, ColorFunction -> "AvocadoColors", PlotLabel -> "|E\!\(\*SuperscriptBox[\(|\), \(2\)]\)",
PlotRange -> {0, 0.02}, LabelStyle -> {Black, Bold}, Epilog -> {Gray, Polygon[{{-5, -5}, {-h, -5}, {-h, 5}, {-5, 5}}]}]
,
ListPlot[s, PlotRange -> {0, 2}, Joined -> True, Axes -> False, Frame -> True, LabelStyle -> {Black, Bold}, PlotStyle -> {Black, Thick}, FrameLabel -> {"Distance from the mirror / \[Lambda]",
"P/\!\(\*SubscriptBox[\(P\), \(\[Infinity]\)]\)"}, Epilog -> {PointSize[0.03], Red, Point[{h, Evaluate[(1/s0 Abs[NIntegrate[G[{Cos[\[Theta]], Sin[\[Theta]]}] - G[{Cos[\[Theta]], Sin[\[Theta]]} - {2*h, 0}], {\[Theta], 0, 2 \[Pi]}] ])^2]}]}]
}, ImageSize -> Large]
, {h, 3, 0, -0.05}];
ListAnimate[p1]
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http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse |
说明
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Dipole next to a mirror changes both the radiation pattern and the total power emitted
Quando un dipolo si trova vicino a uno specchio cambiano sia la distribuzione angolare della sua emissione, che la potenza totale emessa.
15 7 2019
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| 日期/时间 | 缩略图 | 大小 | 用户 | 备注 | |
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| 当前 | 2019年7月16日 (二) 09:31 | 576 × 245(1.42 MB) | wikimediacommons>Berto | User created page with UploadWizard |
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