title: Anomalies of dielectric-coated gratings.
abstract: 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.
authors.forename: V D
authors.initials: VD
authors.lastname: Agrawal
authors.forename: Y T
authors.initials: YT
authors.lastname: Lo