Abstract
We develop a full vectorial theoretical investigation of the chemical interface
detection in conventional coherent anti-Stokes Raman scattering (CARS) microscopy. In
Part I, we focus on the detection of axial interfaces (i.e.,
parallel to the optical axis) following a recent experimental demonstration of the
concept [Phys. Rev. Lett. 104, 213905 (2010)]. By
revisiting the Young’s double slit experiment, we show that background-free
microscopy and spectroscopy is achievable through the angular analysis of the CARS
far-field radiation pattern. This differential CARS in k space (-CARS) technique is interesting for fast detection of interfaces
between molecularly different media. It may be adapted to other coherent and resonant
scattering processes.
© 2011 Optical Society of America
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