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Refractive index measurement using single fiber reflectance spectroscopy
Author(s) -
Zhang Xu U.,
Faber Dirk J.,
Post Anouk L.,
van Leeuwen Ton G.,
Sterenborg Henricus J. C. M.
Publication year - 2019
Publication title -
journal of biophotonics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 66
eISSN - 1864-0648
pISSN - 1864-063X
DOI - 10.1002/jbio.201900019
Subject(s) - refractive index , materials science , optics , wavelength , optical fiber , spectroscopy , fiber , reflectivity , accuracy and precision , optoelectronics , physics , quantum mechanics , composite material
A method using single fiber reflectance spectroscopy to measure the refractive indices of transparent and turbid media over a broad wavelength range is presented and tested. For transparent liquid samples, the accuracy is within 0.2%, and the accuracy increases with increasing wavelength. For liquid turbid media, the accuracy is within 0.3% and increases with decreasing wavelength. For solid turbid samples, such as human skin, the accuracy critically depends on the optical contact between the fiber and sample surface. It is demonstrated that this technique has the potential to measure refractive indices of biological tissue in vivo.