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Related Experiment Video

Updated: May 13, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

Radial angular filter arrays for angle-resolved scattering spectroscopy.

Yan Zhang¹, Fartash Vasefi, Mohamadreza Najiminaini

¹Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada.

|March 14, 2013

Summary

This summary is machine-generated.

The radial angular filter array (RAFA) is a novel micro-machined device that precisely measures photon angular distribution. This technology enables detailed analysis of light scattering in turbid samples.

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Area of Science:

Optics and Photonics
Microfabrication
Spectroscopy

Background:

Angular distribution of photons is crucial for understanding light scattering.
Existing methods for measuring angular photon distribution can be complex and limited.
Micro-machined optical components offer potential for advanced light manipulation.

Purpose of the Study:

To design, fabricate, and test a radial angular filter array (RAFA) for measuring photon angular distribution.
To evaluate the impact of geometric parameters and fabrication imperfections on RAFA performance.
To demonstrate the application of RAFA in capturing angle-resolved spectra of turbid samples.

Main Methods:

Design and micro-fabrication of radial angular filter arrays with high aspect ratio channels.
Characterization of RAFA performance, including angular resolution, cross-talk, and achromaticity.
Integration of RAFA with an imaging spectrometer for angle-resolved spectral measurements.

Main Results:

Successful fabrication of RAFA devices with controlled geometric parameters.
Demonstrated ability of RAFA to reject out-of-angle photons effectively.
Quantified performance metrics such as inter-channel cross talk and channel leakage.
Successful acquisition of angle-resolved spectra from turbid samples using the RAFA-spectrometer system.

Conclusions:

The radial angular filter array (RAFA) is a viable technology for measuring photon angular distribution.
RAFA performance is influenced by device geometry and fabrication quality.
RAFA enables advanced optical measurements, such as angle-resolved spectroscopy of scattering media.