File:Fractional OAM modes 3 to 4 with vortices svg.svg
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Captions
Captions
Light modes with fractional orbital angular momentum
Summary
[edit]| Description |
English: Light beams with well-defined orbital angular momentum have helical wavefronts given by , where is an integer. One can study also beams with non-integral . Such beams have complicated phase as well as intensity profiles and multiple discontinuities with optical vortices. In the figure, a sample of beams with several values of are shown. The intensity profiles are in the first row, the phase profiles in the second row. For , there is only a single optical vortex in the center with topological charge 3. For , there are three vortices off center, each with charge 1. For , a series of vortices appears along the positive x-axis, resulting in the half-line of intensity minimum. For , four vortices with charge 1 appear and for one recovers a single vortex with charge 4. Čeština: Světelný svazek s dobře definovaným orbitálním momentem hybnosti má šroubovicovité vlnoplochy dány vzorcem , kde je celé číslo. Lze studovat i svazky s neceločíselným . Takové svazky mají komplikované profily fáze i intenzity s vícero nespojitostmi a optickými víry. Na obrázku je představen výběr svazků s několika hodnotami . V prvním řádku jsou profily intenzity, ve druhém pak profily fáze. Pro se objevuje jediný vír uprostřed s topologickým nábojem 3. Pro se objevují dále od středu tři víry, každý o náboji 1. Pro se podél kladné x-ové osy nachází série vírů, což vyúsťuje v polopřímku minimální intenzity. Pro se obdrží čtyři víry o náboji 1 a pro se opět získá jediný vír s nábojem 4. |
| Date | |
| Source | Own work |
| Author | JozumBjada |
Licensing
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I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Source code
[edit]
This figure was created using Wolfram language 12.0.0 for Microsoft Windows (64-bit) (April 6, 2019). The source code follows.
(* ::Package:: *)
(* ::Title:: *)
(*Fractional OAM*)
(* ::Section:: *)
(*Routines*)
(* ::Input::Initialization:: *)
colorbarFun[colorfun_,{low_,mid_,high_},{minx_:0,maxx_:35},{miny_:-350,maxy_:350},fontFamily_:"Times New Roman"]:=Module[{textoff=20,lineoff=50,fontSize=10,plot},
plot=DensityPlot[y+miny,{x,minx,maxx},{y,miny,maxy},ColorFunction->colorfun,Frame->False,PlotRangePadding->None];
plot=First@Cases[InputForm@plot,_GraphicsComplex,Infinity,1];
Graphics[{
Rectangle[{-2+minx,miny},{maxx+1,maxy}],
plot,
Line[{
{{-2+minx,miny},{lineoff+maxx,miny}},
{{-2+minx,maxy+1},{lineoff+maxx,maxy+1}},
{{-2+minx,0},{maxx+textoff/2,0}}
}],
Text[Style[low,FontFamily->fontFamily,FontSize->fontSize],{textoff+maxx,miny},{-1,-1}],
Text[Style[mid,FontFamily->fontFamily,FontSize->fontSize],{textoff+maxx,0},{-1,0}],
Text[Style[high,FontFamily->fontFamily,FontSize->fontSize],{textoff+maxx,maxy},{-1,1}]
},ImageSize->{Automatic,(maxy-miny)},PlotRangePadding->None]
]
(* ::Input::Initialization:: *)
fourierShift[arr_]:=Module[{nx,ny},
{nx,ny}=Dimensions[arr];
RotateRight[#,Floor[nx/2]]&/@RotateRight[arr,Floor[ny/2]]
]
(* ::Input::Initialization:: *)
plotMagnitudePhase[charge_,zoomnum_:50,sanmplingnum_:2^10]:=Module[{num=sanmplingnum,farr,nx,ny,zoom,magn,phas,transfun,ftmode,inmode,w0=.1,dist=900,len=2,dx,\[Lambda]=808*^-9,imgSize=700},
dx=len/num;
inmode=Table[If[x==0&&y==0,1.,N@Exp[I charge ArcTan[x,y]]Exp[-(x^2+y^2)/w0^2]],{x,-(len/2)+dx,len/2,dx},{y,-(len/2)+dx,len/2,dx}];
inmode=inmode/Norm[inmode,"Frobenius"];
transfun=Table[N@Exp[I \[Pi] dist \[Lambda] (kx^2+ky^2)],{kx,-(1/(2dx)),1/(2dx)-1/len,1/len},{ky,-(1/(2dx)),1/(2dx)-1/len,1/len}];
transfun=fourierShift[transfun];
ftmode=Fourier[fourierShift[inmode]];
farr=fourierShift[InverseFourier[transfun ftmode]];
{nx,ny}=Dimensions[farr];
zoom=farr[[Floor[nx/2-zoomnum];;Floor[nx/2+zoomnum],Floor[ny/2-zoomnum];;Floor[ny/2+zoomnum]]];
zoom=Reverse@Transpose@Reverse[zoom];
magn=Normalize[Abs[zoom]^2,Max];
magn=ListDensityPlot[magn,ImageSize->imgSize,PlotRange->All,ColorFunction->ColorData["SunsetColors"],Frame->False,PlotRangePadding->None];
phas=Arg[zoom];
phas=ListDensityPlot[phas,ImageSize->imgSize,PlotRange->All,ColorFunction->Hue,Frame->False,PlotRangePadding->None];
{magn,phas}
]
(* ::Input::Initialization:: *)
annotatePlot[plot_,circpos_,rad_:ImageScaled[0.03],rest_:{}]:=Show[plot,Graphics[{EdgeForm[{Black,Thickness[.005]}],Thickness[.005],Circle[#,rad]&/@circpos,Transparent,rest},ImageSize->700]]
(* ::Section:: *)
(*Computation*)
(* ::Input:: *)
(*charges34={3,3.25,3.5,3.75,4};*)
(* ::Input:: *)
(*AbsoluteTiming[arrs34=plotMagnitudePhase/@charges34;]*)
(* ::Input:: *)
(*{magn34,phas34}=Transpose[arrs34];*)
(* ::Input:: *)
(*colorBarMagn=colorbarFun["SunsetColors",{0,0.5,1},{0,35},{-350,350}];*)
(*colorBarPhas=colorbarFun[Hue,{0,\[Pi],2\[Pi]},{0,35},{-350,350}];*)
(* ::Input:: *)
(*phas34aux={*)
(*annotatePlot[phas34[[1]],{ImageScaled@{0.5,0.5}},ImageScaled[0.07]],*)
(*annotatePlot[phas34[[2]],{{55.14`,54.86`},{49.14`,47.57`},{49.`,54.14`}}],*)
(*annotatePlot[phas34[[3]],{{55.5,56},{48,56},{46.5,48}},ImageScaled[0.03],Rectangle[ImageScaled[{0.61,0.35}],ImageScaled[{1,0.55}]]],*)
(*annotatePlot[phas34[[4]],{{55.`,56.14`},{48.29`,55.86`},{46.71`,48.43`},{60.`,44.57`}}],*)
(*annotatePlot[phas34[[5]],{ImageScaled@{0.5,0.5}},ImageScaled[0.07]]*)
(*};*)
(* ::Input:: *)
(*grid34aux=Grid[{Framed[Style["\[ScriptL] = "<>ToString[#],60,FontFamily->"Times"],Alignment->Center,ImageSize->{700,60},FrameStyle->Thick]&/@charges34,Join[magn34,{colorBarMagn}],Join[phas34aux,{colorBarPhas}]}]*)
(* ::Section:: *)
(*Export*)
(* ::Input:: *)
(*SetDirectory[NotebookDirectory[]]*)
(* ::Input:: *)
(*Export["grid34vortices.png",grid34aux,ImageResolution->200]*)
(*Export["grid34vortices.svg",grid34aux,ImageResolution->200]*)
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:04, 10 January 2022 | | 4,598 × 1,840 (4.07 MB) | JozumBjada (talk | contribs) | Cross-wiki upload from cs.wikipedia.org |
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