title: Spatial coherence effect on layer thickness determination in narrowband full-field optical coherence tomography.
abstract: Longitudinal spatial coherence (LSC) is determined by the spatial frequency content of an optical beam. The use of lenses with a high numerical aperture (NA) in full-field optical coherence tomography and a narrowband light source makes the LSC length much shorter than the temporal coherence length, hence suggesting that high-resolution 3D images of biological and multilayered samples can be obtained based on the low LSC. A simplified model is derived, supported by experimental results, which describes the expected interference output signal of multilayered samples when high-NA lenses are used together with a narrowband light source. An expression for the correction factor for the layer thickness determination is found valid for high-NA objectives. Additionally, the method was applied to a strongly scattering layer, demonstrating the potential of this method for high-resolution imaging of scattering media.
authors.affiliation: Department of Electro Optic Engineering and the Ilse Katz Institute for Nanoscale Science and Technology, Ben Gurion University of the Negev, Beer Sheva 84105, Israel. safrana@bgu.ac.il
authors.forename: Avner
authors.initials: A
authors.lastname: Safrani
authors.forename: Ibrahim
authors.initials: I
authors.lastname: Abdulhalim
mesh_terms: D003198:Computer Simulation; D007909:Lenses; D008027:Light; D012542:Scattering, Radiation; D041623:Tomography, Optical Coherence / Q000379:methods*