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Millimeter-wave phase resonances in compound reflection gratings with subwavelength grooves

Beruete, M; Navarro-Ćia, M; Sorolla, M; Skigin, DC; (2010) Millimeter-wave phase resonances in compound reflection gratings with subwavelength grooves. Optics Express , 18 (23) 23957 - 23964. 10.1364/OE.18.023957. Gold open access

Abstract

Experimental evidence of phase resonances in a dual-period reflection structure comprising three subwavelength grooves in each period is provided in the millimeter-wave regime. We have analyzed and measured the response of these structures and show that phase resonances are characterized by a minimum in the reflected response, as predicted by numerical calculations. It is also shown that under oblique incidence these structures exhibit additional phase resonances not present for normal illumination because of the potentially permitted odd field distribution. A satisfactory agreement between the experimental and numerical reflectance curves is obtained. These results confirm the recent theoretical predictions of phase resonances in reflection gratings in the millimeter-wave regime, and encourage research in this subject due to the multiple potential applications, such as frequency selective surfaces, backscattering reduction and complex-surface-wave-based sensing. In addition, it is underlined here that the response becomes much more complex than the mere infinite analysis when one considers finite periodic structures as in the real experiment. © 2010 Optical Society of America.

Type:Article
Title:Millimeter-wave phase resonances in compound reflection gratings with subwavelength grooves
Open access status:An open access publication
DOI:10.1364/OE.18.023957
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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