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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 6, Iss. 4 — May. 4, 2011

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

K. I. Popov, A. F. Pegoraro, A. Stolow, and L. Ramunno  »View Author Affiliations


Optics Express, Vol. 19, Issue 7, pp. 5902-5911 (2011)
http://dx.doi.org/10.1364/OE.19.005902


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Abstract

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.

© 2011 Optical Society of America

OCIS Codes
(170.1650) Medical optics and biotechnology : Coherence imaging
(170.5660) Medical optics and biotechnology : Raman spectroscopy
(180.4315) Microscopy : Nonlinear microscopy

ToC Category:
Microscopy

History
Original Manuscript: February 3, 2011
Revised Manuscript: February 28, 2011
Manuscript Accepted: March 1, 2011
Published: March 15, 2011

Virtual Issues
Vol. 6, Iss. 4 Virtual Journal for Biomedical Optics

Citation
K. I. Popov, A. F. Pegoraro, A. Stolow, and L. Ramunno, "Image formation in CARS microscopy: effect of the Gouy phase shift," Opt. Express 19, 5902-5911 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-19-7-5902


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