title: Radial angular filter arrays for angle-resolved scattering spectroscopy.
abstract: The radial angular filter array (RAFA) consists of a series of radially-distributed micro-machined channels, where the long axes of the channels converge at a focal point. The high aspect ratio of each channel provides a means to reject photons with trajectories outside the acceptance angle of the channel. The output of the RAFA represents the angular distribution of photons emitted from the focal point. A series of RAFAs were designed, fabricated, and tested to evaluate the impact of device geometry, inter-channel cross talk, achromaticity, and channel leakage on device performance. As an application example, an RAFA was used together with an imaging spectrometer to capture angle-resolved spectra of turbid samples.
authors.affiliation: Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada.
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fartash
authors.initials: F
authors.lastname: Vasefi
authors.forename: Mohamadreza
authors.initials: M
authors.lastname: Najiminaini
authors.forename: Bozena
authors.initials: B
authors.lastname: Kaminska
authors.forename: Jeffrey J L
authors.initials: JJ
authors.lastname: Carson
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D008027:Light; D009391:Nephelometry and Turbidimetry / Q000295:instrumentation*; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D013057:Spectrum Analysis / Q000295:instrumentation*