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

Image 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....

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Bibliographic Details
Published in:Optics express 2011-03, Vol.19 (7), p.5902-5911
Main Authors: Popov, K I, Pegoraro, A F, Stolow, A, Ramunno, L
Format: Article
Language:English
Subjects:
Computer Simulation
Computer-Aided Design
Equipment Design
Equipment Failure Analysis
Image Interpretation, Computer-Assisted - methods
Microscopy - instrumentation
Microscopy - methods
Models, Theoretical
Spectrum Analysis, Raman - instrumentation
Spectrum Analysis, Raman - methods
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Summary:Image 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.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.19.005902