Image formation in CARS microscopy: effect of the Gouy phase shift

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DOIResolve DOI: http://doi.org/10.1364/OE.19.005902
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TypeArticle
Journal titleOptics Express
Volume19
Issue7
Pages59025911; # of pages: 10
AbstractImage formation in Coherent Anti-Stokes Raman Scattering (CARS) microscopy of sub-wavelength objects is investigated via a combined experimental, numerical and theoretical study. We consider a resonant spherical object in the presence of a nonresonant background, using tightly focused laser pulses. When the object is translated along the laser propagation axis, we find the CARS signal to be asymmetric about the laser focal plane. When the object is located before the focus, there is a distinct shadow within the image, whereas the brightest signal is obtained when the object is behind the focus. This behaviour is caused by interference between resonant and nonresonant signals, and the Gouy phase shift is responsible for the observed asymmetry within the image.
Publication date
LanguageEnglish
AffiliationNRC Steacie Institute for Molecular Sciences; National Research Council Canada
Peer reviewedYes
NPARC number19739653
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Record identifierd7ba26f4-bc75-4f57-9cb0-1d919059e5c5
Record created2012-04-02
Record modified2016-05-09
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