Abstract
This paper is devoted to the study of the transmission properties of Slanted Annular Aperture Arrays made in perfectly conducting metal. More precisely, we consider the transmission based on the excitation of the cutoff-less guided mode, namely the TEM mode. We numerically and analytically demonstrate some intrinsic properties of the structure showing a transmission coefficient of at least 50% of an unpolarized incident beam independently of the illumination configuration (angle and plane of incidence). The central symmetry exhibited by the structure is analytically exploited to demonstrate the existence of a polarization state for which all the incident energy is transmitted through the sub-wavelength apertures when the eigenmode is excited, whatever are the illumination and the geometrical parameters. For this state of polarization, the laminar flow of the energy through the structure can exhibit giant deviation over very small distances. An example of energy flow deviation of 220° per wavelength is presented for illustration. The results presented in this paper could be considered as an important contribution to the understanding of the enhanced transmission phenomenon based on the excitation of guided modes.
Highlights
The enhanced light transmission (ET) phenomenon through sub-wavelength apertures in metal plates have already attracted researchers’ attention [1, 2]
This paper is devoted to the study of the transmission properties of Slanted Annular Aperture Arrays made in perfectly conducting metal
More than ten years ago, efficient enhanced transmission through these aperture arrays (AAA) was obtained using the excitation of the second guided mode [18,19], the T E11 mode that exhibits a large wavelength cutoff compared to the waveguide diameter
Summary
The enhanced light transmission (ET) phenomenon through sub-wavelength apertures in metal plates have already attracted researchers’ attention [1, 2]. More than ten years ago, efficient enhanced transmission (up to 93% in the visible range) through these AAAs was obtained using the excitation of the second guided mode [18,19], the T E11 mode that exhibits a large wavelength cutoff compared to the waveguide diameter. Due to the small metal thickness, the T E11 mode is mainly excited at its cutoff, meaning that it is associated to a very low group velocity and a quasi-infinite phase velocity [21] All these attributes provide quite interesting properties for applications in various fields as the protection of radars (radomes) [22], photovoltaic, non-linear enhancement [23], optical trapping [24] or in the design of metamaterials with giant artificial birefringence [25]
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