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. 2009 Oct 15;34(20):3196-8.
doi: 10.1364/OL.34.003196.

Scanning fiber angle-resolved low coherence interferometry

Yizheng Zhu  1 , Neil G Terry, Adam Wax
Affiliations

Scanning fiber angle-resolved low coherence interferometry

Yizheng Zhu et al. Opt Lett. .

Abstract

We present a fiber-optic probe for Fourier-domain angle-resolved low coherence interferometry for the determination of depth-resolved scatterer size. The probe employs a scanning single-mode fiber to collect the angular scattering distribution of the sample, which is analyzed using the Mie theory to obtain the average size of the scatterers. Depth sectioning is achieved with low coherence Mach-Zehnder interferometry. In the sample arm of the interferometer, a fixed fiber illuminates the sample through an imaging lens and a collection fiber samples the backscattered angular distribution by scanning across the Fourier plane image of the sample. We characterize the optical performance of the probe and demonstrate the ability to execute depth-resolved sizing with subwavelength accuracy by using a double-layer phantom containing two sizes of polystyrene microspheres.

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Figures

Fig. 1
Fig. 1
Configuration of the scanning-fiber a/LCI system and the probe tip assembly (inset).
Fig. 2
Fig. 2
(Color online) Depth-dependence of the angular range. (a) Depth-resolved angular scattering from a single chamber filled with 0.26 μm microspheres. (b) Angular scattering intensity at various sample depths (relative to the back surface of the coverslip) indicating a decreasing angular range.
Fig. 3
Fig. 3
(Color online) Double-layer phantom test. (a) Depth-resolved angular scattering distribution of the double-layer phantom; inset, two-layer phantom made of coverslip (CS) and microscope slide (MS). (b), (c) Mie analysis of the measured scattering pattern for each sample layer.
See this image and copyright information in PMC

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