Experimental results at millimeter wavelengths on dielectric-coated gratings are reported that show sharp anomalous dips in the transmission intensity for both P and S polarizations (i.e., incident electric field parallel and perpendicular to the slits, respectively). These dips almost disappear when either the dielectric is removed or the slits are randomly spaced. Next, a theory is developed for the gratings of finite extent and nonuniform spacings. Theoretical results, although approximate, agree remarkably well with the experiment.
© 1972 Optical Society of America
Original Manuscript: January 24, 1972
Published: September 1, 1972
Vishwani D. Agrawal and Yuen T. Lo, "Anomalies of Dielectric-Coated Gratings," Appl. Opt. 11, 1946-1951 (1972)