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Generationofsub-wavelengthandsuper-resolutionlongitudinallypolarizednon-diffractionbeamusinglensaxicon
Itiswellknownthatalightspotofsub-wavelengthwilldivergeinalldirections.Inthisletter,Amethodispresentedforgeneratingsub-wavelength(0.44\lambda)longitudinallypolarizedbeam,whichpropagateswithoutdivergenceoverlengthsofabout2\lambdainfreespace.Thisisachievedbyahighnumericalaperture(NA)lensaxiconthatutilizessphericalaberrationtoduplicatetheperformanceofanaxiconandtocreateanextendedfocalline.