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Proceedings Paper

Angle-resolved spectroscopy using a radial angular filter array
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Paper Abstract

This paper presents a novel optical filter called the Radial Angular Filter Array (RAFA) for real-time measurement of the angular and spectral distribution of diffuse light exiting a turbid medium. The RAFA consists of a radiallydistributed series of 48 micro-channels micro-machined into a silicon substrate. To test the device, we constructed an angle-resolved spectroscopy system by integrating a wideband light source, the RAFA, and an imaging spectrometer. The collimated broadband light source was configured to trans-illuminate a turbid sample over a wide range of wavelengths in the near infrared spectral region. The RAFA was used to collect the angular distribution of light exiting the turbid sample. The imaging spectrometer decomposed the output of the RAFA into hyperspectral images representative of scatter angle and wavelength. By scanning the RAFA and imaging spectrometer over the sample, the intensity of the scattered light was acquired as a function of location on the sample surface, wavelength, and angle relative to the surface normal. With angle resolved spectroscopy it will be possible to characterize the optical properties of turbid samples in great detail.

Paper Details

Date Published: 22 March 2010
PDF: 7 pages
Proc. SPIE 7562, Optical Interactions with Tissues and Cells XXI, 756209 (22 March 2010); doi: 10.1117/12.841548
Show Author Affiliations
Fartash Vasefi, Simon Fraser Univ. (Canada)
Lawson Health Research Institute (Canada)
Mohamadreza Najiminaini, Simon Fraser Univ. (Canada)
Lawson Health Research Institute (Canada)
Eldon Ng, Lawson Health Research Institute (Canada)
The Univ. of Western Ontario (Canada)
Bozena Kaminska, Simon Fraser Univ. (Canada)
Haishan Zeng, The BC Cancer Research Ctr. (Canada)
Glenn H. Chapman, Simon Fraser Univ. (Canada)
Jeffrey J.L. Carson, Lawson Health Research Institute (Canada)
Univ. of Western Ontario (Canada)

Published in SPIE Proceedings Vol. 7562:
Optical Interactions with Tissues and Cells XXI
E. Duco Jansen; Robert J. Thomas, Editor(s)

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