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Proceedings Paper

Achromatic waveplate array for polarimetric imaging
Author(s): Cornell S. L. Chun
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Paper Abstract

Imaging sensors to detect circular polarization, which have high sensitivity and high frame rates and are light weight and portable, have not been developed. In this paper, we report on our development of novel microscale achromatic retarders. A 2D array of these retarders can be combined with an array of linear polarizers in an imaging sensor. This sensor will be able to capture images of the four Stokes parameters over a wide wavelength band. The achromatic retarder is a combination of two single-order waveplates. Each single-order waveplate is a surface-relief grating. We have calculated the retardance of the combination, using effective medium theory. For light at normal incidence on the achromatic retarder, the retardance is nearly independent of wavelength in the range 3-5 microns and deviates forma mean value of 90 percent by less than 1 percent. We also show that, as field angle is increased, the retardance of our composite retarder deviates less than the retardance of a waveplate formed from a single surface- relief grating. Another advantage of the composite structure is than the achromatic retarder can be fabricated with large aperture on large area substrates.

Paper Details

Date Published: 9 January 2002
PDF: 12 pages
Proc. SPIE 4481, Polarization Analysis and Measurement IV, (9 January 2002); doi: 10.1117/12.452892
Show Author Affiliations
Cornell S. L. Chun, Physics Innovations, Inc. (United States)

Published in SPIE Proceedings Vol. 4481:
Polarization Analysis and Measurement IV
Dennis H. Goldstein; David B. Chenault; Walter G. Egan; Michael J. Duggin; Walter G. Egan; Michael J. Duggin, Editor(s)

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