Please use this identifier to cite or link to this item: https://doi.org/10.1364/OE.18.010888
Title: Effects of scatterers' sizes on near-field coherent anti-Stokes Raman scattering under tightly focused radially and linearly polarized light excitation
Authors: Lin, J.
Zheng, W. 
Wang, H.
Huang, Z. 
Issue Date: 10-May-2010
Source: Lin, J., Zheng, W., Wang, H., Huang, Z. (2010-05-10). Effects of scatterers' sizes on near-field coherent anti-Stokes Raman scattering under tightly focused radially and linearly polarized light excitation. Optics Express 18 (10) : 10888-10895. ScholarBank@NUS Repository. https://doi.org/10.1364/OE.18.010888
Abstract: We employ the finite-difference time-domain (FDTD) technique as a numerical approach to studying the effects of scatterers' sizes on near-field coherent anti-Stokes Raman scattering (CARS) microscopy under tightly focused radially and linearly polarized light excitations. The FDTD results show that in a uniform medium (water), the full width at half maximum (FWHM) (transverse resolution) of radially polarized near-field CARS (RP-CARS) radiation is approximately 7.7% narrower than that of linearly polarized near-field CARS (LP-CARS) imaging, whereas the depth of focus (DOF) of RP-CARS radiation is 6.5% longer than LP-CARS. However, with the presence of scatterers in the uniform medium, both the FHWM and DOF of near-field RP-CARS radiation become much narrower compared to those of near-field LP-CARS radiation. In addition, the signal to nonresonant background ratio of near-field RP-CARS is significantly improved when the scatterer's size is larger than a half wavelength of the pump light field. This work suggests that near-field CARS radiations are strongly influenced by the scatterers' sizes in the medium; and near-field RP-CARS microscopy is superior to the near-field LP-CARS by providing both higher transverse and axial resolutions for three-dimensional molecular imaging of fine structures in biological systems. © 2010 Optical Society of America.
Source Title: Optics Express
URI: http://scholarbank.nus.edu.sg/handle/10635/67021
ISSN: 10944087
DOI: 10.1364/OE.18.010888
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