Mastering the propagation through stacked perforated plates: Subwavelength holes vs. propagating holes

Research output: Contribution to journalArticlepeer-review

Authors

  • M. Beruete
  • F. Falcone
  • J. M. Illescas
  • I. Campillo
  • M. Sorolla Ayza

Colleges, School and Institutes

External organisations

  • Universidad Pública de Navarra
  • Pol. Mocholi
  • CIC NanoGUNE Consolider
  • TAFCO Metawireless

Abstract

More insight on the physics underlying the transmission through subwavelength hole arrays prism by comparing it with propagating hole arrays prism is provided. We show the critical role that the size of the holes plays in this electromagnetic propagation, changing the effective index of refraction from negative (backward wave) to positive values (forward wave) as the hole diameter increases. This causes negative refraction for the zeroth order emerging beam in the cut-off holes prism whereas positive refraction in the non-cut-off holes prism. Furthermore, we revisited from the perspective of superposition principle the explanation of these stacks based on the so-called building sub-units: horizontal rods and vertical wires. Our simple analysis reveals the drawbacks of this earlier interpretation, and reinforces the powerful model founded on a inverse transmission line. Experimental results (co-and cross-polar measurements) performed at the V-band of the millimeter-waves in the Fresnel zone are well supported by numerical analyses. As expected, higher order diffracted outgoing beams are recorded for the classical prism but not for the cut-off holes prism.

Details

Original languageEnglish
Article number5871297
Pages (from-to)2980-2988
Number of pages9
JournalIEEE Transactions on Antennas and Propagation
Volume59
Issue number8
Publication statusPublished - Aug 2011

Keywords

  • Extraordinary transmission, frequency selective surfaces, metamaterials, negative index of refraction, perforated plates