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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 3, Iss. 5 — May. 1, 2012
  • pp: 958–965

Quantitative phase spectroscopy

Matthew Rinehart, Yizheng Zhu, and Adam Wax  »View Author Affiliations


Biomedical Optics Express, Vol. 3, Issue 5, pp. 958-965 (2012)
http://dx.doi.org/10.1364/BOE.3.000958


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Abstract

Quantitative phase spectroscopy is presented as a novel method of measuring the wavelength-dependent refractive index of microscopic volumes. Light from a broadband source is filtered to an ~5 nm bandwidth and rapidly tuned across the visible spectrum in 1 nm increments by an acousto-optic tunable filter (AOTF). Quantitative phase images of semitransparent samples are recovered at each wavelength using off-axis interferometry and are processed to recover relative and absolute dispersion measurements. We demonstrate the utility of this approach by (i) spectrally averaging phase images to reduce coherent noise, (ii) measuring absorptive and dispersive features in microspheres, and (iii) quantifying bulk hemoglobin concentrations by absolute refractive index measurements. Considerations of using low coherence illumination and the extension of spectral techniques in quantitative phase measurements are discussed.

© 2012 OSA

OCIS Codes
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(170.0170) Medical optics and biotechnology : Medical optics and biotechnology
(180.3170) Microscopy : Interference microscopy
(300.0300) Spectroscopy : Spectroscopy
(110.4234) Imaging systems : Multispectral and hyperspectral imaging
(090.6186) Holography : Spectral holography

ToC Category:
Spectroscopic Diagnostics

History
Original Manuscript: March 14, 2012
Revised Manuscript: April 5, 2012
Manuscript Accepted: April 10, 2012
Published: April 12, 2012

Citation
Matthew Rinehart, Yizheng Zhu, and Adam Wax, "Quantitative phase spectroscopy," Biomed. Opt. Express 3, 958-965 (2012)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-3-5-958


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References

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