Polarization-Dependent Phase Shift In High-Efficiency Gratings

M. L. Minden; G. J. Dunning

doi:10.1117/12.965663

10 February 1981 Polarization-Dependent Phase Shift In High-Efficiency Gratings

M. L. Minden, G. J. Dunning

Proceedings Volume 0240, Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I; (1981) https://doi.org/10.1117/12.965663
Event: 24th Annual Technical Symposium, 1980, San Diego, United States

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.

Citation Download Citation

M. L. Minden and G. J. Dunning "Polarization-Dependent Phase Shift In High-Efficiency Gratings", Proc. SPIE 0240, Periodic Structures, Gratings, Moire Patterns, and Diffraction Phenomena I, (10 February 1981); https://doi.org/10.1117/12.965663

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