Separating the scattering and absorption coefficients using the real and imaginary parts of the refractive index with low-coherence interferometry | Zendy

Francisco E. Robles | Zendy; Adam Wax | Zendy

Open Access

Separating the scattering and absorption coefficients using the real and imaginary parts of the refractive index with low-coherence interferometry

Author(s) -

Francisco E. Robles,

Adam Wax

Publication year - 2010

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.35.002843

Subject(s) - refractive index , interferometry , optics , scattering , coherence (philosophical gambling strategy) , absorption (acoustics) , phase (matter) , attenuation coefficient , physics , forward scatter , materials science , quantum mechanics

We present an analytical method that yields the real and imaginary parts of the refractive index (RI) from low-coherence interferometry measurements, leading to the separation of the scattering and absorption coefficients of turbid samples. The imaginary RI is measured using time-frequency analysis, with the real part obtained by analyzing the nonlinear phase induced by a sample. A derivation relating the real part of the RI to the nonlinear phase term of the signal is presented, along with measurements from scattering and nonscattering samples that exhibit absorption due to hemoglobin.

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