Experimental verification of extraordinary transmission without surface plasmons

Abstract

This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.This letter provides an experimental demonstration of extraordinary transmission in a closed waveguide system loaded with an electrically small diaphragm. This is a situation where the standard surface plasmon polariton SPP theory does not apply. The theoretical explanation is then based on the concept of impedance matching. This concept has previously been applied by some of the authors to account for enhanced transmission in situations where surface plasmon theory can be used: periodic arrays of small holes or slits in flat metal screens. The experiment in this letter supports the impedance matching model, valid for when SPPs are present or not. © 2009 American Institute of PhysicsThe authors would like to acknowledge the support of this research by the Spanish Ministry of Science and Innovation and European Union Feder Funds Grant Nos. TEC2007-65376 and Consolider Ingenio 2010 CSD2008- 00066 and by the Spanish Junta de Andalucía Project No. TIC-25

Analytical model for the transmission of electromagnetic waves through arrays of slits in perfect conductors and lossy metal screens

“…In Fig. 5(a) we plot the mode matching (exact) results together with the analytical values obtained with the formulas in (17) and (21). Similar data are shown in Fig.…”

“…However, close inspection of the curve for a=d ¼ 0:4 in Fig. 5(b) shows that some transmission occurs at that frequency point (the numerically computed value for jS 21 …”

“…Some authors have also reported on ET in the absence of this kind of surface wave, 18 although a different type of surface wave is still involved in the case studied. However, different studies reported on ET through small diaphragms located inside closed metallic waveguides, [19][20][21][22] which showed that ET is not always linked to the presence of surface waves. This fact motivated some of the authors of this paper to carry out efforts to develop a unified theoretical framework for a variety of situations found in practice.…”

“…24 automatically accounts for both SPP-mediated processes and for cases where SPPs do not play any role. 21,22 The impedance matching approach lends itself to simple equivalent circuits having a small number of parameters to be determined. Once these parameters are known, the transmission and reflection spectra in the frequency band of interest can be analytically obtained.…”

Enhanced Design of Narrowband Filters Based on the Extraordinary Transmission Through Single Fishnet Structures

“…Being relatively simple, such models facilitate the analysis and design process of diverse practical components. Besides, in accordance with these equivalent circuits, the periodicity of the resulting device is not a necessary prerequisite for the phenomenon to appear, as also experimentally proven in [29].…”