title: Bessel beam CARS of axially structured samples.
abstract: We report about a Bessel beam CARS approach for axial profiling of multi-layer structures. This study presents an experimental implementation for the generation of CARS by Bessel beam excitation using only passive optical elements. Furthermore, an analytical expression is provided describing the generated anti-Stokes field by a homogeneous sample. Based on the concept of coherent transfer functions, the underling resolving power of axially structured geometries is investigated. It is found that through the non-linearity of the CARS process in combination with the folded illumination geometry continuous phase-matching is achieved starting from homogeneous samples up to spatial sample frequencies at twice of the pumping electric field wave. The experimental and analytical findings are modeled by the implementation of the Debye Integral and scalar Green function approach. Finally, the goal of reconstructing an axially layered sample is demonstrated on the basis of the numerically simulated modulus and phase of the anti-Stokes far-field radiation pattern.
authors.affiliation: Leibniz Institute of Photonic Technology (IPHT) Jena e.v., Albert-Einstein-Str. 9, 07745 Jena, Germany.
authors.forename: Sandro
authors.initials: S
authors.lastname: Heuke
authors.affiliation: 1] Leibniz Institute of Photonic Technology (IPHT) Jena e.v., Albert-Einstein-Str. 9, 07745 Jena, Germany [2] State Key Laboratory of Transient Optics and Photonics,Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi'an 710119, P. R. China.
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Zheng
authors.affiliation: 1] Leibniz Institute of Photonic Technology (IPHT) Jena e.v., Albert-Einstein-Str. 9, 07745 Jena, Germany [2] Institute of Physical Chemistry and Abbe Center of Photonics,Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: Denis
authors.initials: D
authors.lastname: Akimov
authors.affiliation: 1] Leibniz Institute of Photonic Technology (IPHT) Jena e.v., Albert-Einstein-Str. 9, 07745 Jena, Germany [2] Institute of Physical Chemistry and Abbe Center of Photonics,Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany [3] King's College London, Randall Division of Cell and Molecular Biophysics, NHH, Guy's Campus, London SE1 1UL, UK.
authors.forename: Rainer
authors.initials: R
authors.lastname: Heintzmann
authors.affiliation: 1] Leibniz Institute of Photonic Technology (IPHT) Jena e.v., Albert-Einstein-Str. 9, 07745 Jena, Germany [2] Institute of Physical Chemistry and Abbe Center of Photonics,Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Schmitt
authors.affiliation: 1] Leibniz Institute of Photonic Technology (IPHT) Jena e.v., Albert-Einstein-Str. 9, 07745 Jena, Germany [2] Institute of Physical Chemistry and Abbe Center of Photonics,Friedrich-Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Popp