Transmission enhancement through deep subwavelength apertures using connected split ring resonators

Abstract

Abstract:We report astonishingly high transmission enhancement factors through a subwavelength aperture at microwave frequencies by placing connected split ring resonators in the vicinity of the aperture. We carried out numerical simulations that are consistent with our experimental conclusions. We experimentally show higher than 70,000-fold extraordinary transmission through a deep subwavelength aperture with an electrical size of λ/31×λ/12 (width × length), in terms of the operational wavelength. We discuss the physical origins of the phenomenon. Our numerical results predict that even more improvements of the enhancement factors are attainable. Theoretically, the approach opens up the possibility for achieving very large enhancement factors by overcoming the physical limitations and thereby minimizes the dependence on the aperture geometries. ©2010 Optical Society of AmericaOCIS codes: (160.3918) Materials: Metamaterials; (050.1220) Diffraction and gratings: Aperture. References and links1. H. A. Bethe, "Theory of diffraction by small holes," Phys. Rev. 66(7-8), 163-182 (1944). 2. T. W. Ebbesen, H. J. Lezec, H. F. Ghaemi, T. Thio, and P. A. Wolff, "Extraordinary optical transmission through sub-wavelength hole arrays," Nature 391(6668), 667-669 (1998)

Near-field light localization using subwavelength apertures incorporated with metamaterials

“…As it is previously discussed in Ref. [15], the inner loops of the individual SRRs do not play a major part in the transmission enhancement. The magnetic dipole is permanently obstructed when the outer loops are shortened and the waveguiding effect of the highly confined electric fields is thereby demolished.…”

“…Similar scenarios had been investigated in Ref. [15]. In contrast to the real life problem, we can numerically tackle this particular difficulty with perfectly absorbing boundaries.…”

“…Then, in one of our previous studies we discussed the physical origins of the enhancement in terms of the induced surface currents [14]. Recently, we have demonstrated a 70,000-fold enhancement experimentally and analyzed the parameters of the designed structure [15]. Independently, the localization theory has been developed in the 1960s and light localization obtained in a wide range of areas from Contents lists available at SciVerse ScienceDirect Optics Communications j o u r n a l h o m e p a g e : w w w .…”

Science meets magic: photonic metamaterials

“…We have recently extended this transmission enhancement performance to even higher values [7]. The respective design parameters of the connected SRRs (Sample A&B) as depicted in Figure 1.…”

An experimental verification of metamaterial coupled enhanced transmission for antenna applications

“…Inspired from the above conclusions, a number of research work has been carried out for enhancing the transmission using split ring resonators for single band and dual band applications. 11,12 In this paper, we are adopting the same technique for transmission enhancement in a stacked dipole antenna configuration. We have earlier employed the concept of combining the electric and magnetic resonances of the stacked dipole antenna to obtain broadside radiation coverage.…”