22 March 2010 Angle-resolved spectroscopy using a radial angular filter array
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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.
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Fartash Vasefi, Mohamadreza Najiminaini, Eldon Ng, Bozena Kaminska, Haishan Zeng, Glenn H. Chapman, Jeffrey J.L. Carson, "Angle-resolved spectroscopy using a radial angular filter array", Proc. SPIE 7562, Optical Interactions with Tissues and Cells XXI, 756209 (22 March 2010); doi: 10.1117/12.841548; https://doi.org/10.1117/12.841548
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