Abstract-Extraordinary optical transmission inside a waveguide: spatial mode dependence

Kimberly S. Reichel, Peter Y. Lu, Sterling Backus, Rajind Mendis, and Daniel M. Mittleman
https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-24-25-28221

We study the influence of the input spatial mode on the extraordinary optical transmission (EOT) effect. By placing a metal screen with a 1D array of subwavelength holes inside a terahertz (THz) parallel-plate waveguide (PPWG), we can directly compare the transmission spectra with different input waveguide modes. We observe that the transmitted spectrum depends strongly on the input mode. A conventional description of EOT based on the excitation of surface plasmons is not predictive in all cases. Instead, we utilize a formalism based on impedance matching, which accurately predicts the spectral resonances for both TEM and non-TEM input modes.

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