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Proceedings Paper

Polarization-Dependent Phase Shift In High-Efficiency Gratings
Author(s): M. L. Minden; G. J. Dunning
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Paper Abstract

Light diffracted from a high efficiency, reflective grating may undergo a phase shift which depends strongly on the incident polarization. If the incident wave includes both TE (E // groove) and TM (El groove) polarization, then the diffracted orders may be elliptically polarized. This effect is of special interest in curved-line (holographic) gratings in which the eccentricity of the ellipse may vary across the diffracted wavefront. In this paper the existence of a substantial phase shift between the two polarization is demonstrated in gratings with a period-to-wavelength ratio less than one. Measurements are made at 10.6 µm on both ruled and ion-etched gratings. Comparison with theory shows that the measured effect is due to groove shape rather than to finite conductivity of the substrate.

Paper Details

Date Published: 10 February 1981
PDF: 6 pages
Proc. SPIE 0240, Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I, (10 February 1981); doi: 10.1117/12.965663
Show Author Affiliations
M. L. Minden, Hughes Research Laboratories (United States)
G. J. Dunning, Hughes Research Laboratories (United States)

Published in SPIE Proceedings Vol. 0240:
Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I
C. H. Chi; E. G. Loewen; C. L. O'Bryan III, Editor(s)

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