Alaridhee T, Ndao A, Bernal M-P, Popov E, Fehrembach A-L, Baida F I
Opt Express. 2015 May 4;23(9):11687-701. doi: 10.1364/OE.23.011687.
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.
本文致力于研究由完美导电金属制成的倾斜环形孔径阵列的传输特性。更确切地说，我们基于无截止导模（即TEM模）的激发来考虑传输。我们通过数值和解析方法证明了该结构的一些固有特性，表明非偏振入射光束的传输系数至少为50%，且与照明配置（入射角和入射平面）无关。通过解析利用该结构所展现的中心对称性，证明了存在一种偏振态，当激发本征模时，无论照明和几何参数如何，所有入射能量都能通过亚波长孔径传输。对于这种偏振态，能量通过该结构的层流在非常小的距离上会出现巨大偏差。本文给出了每波长能量流偏差达220°的一个示例用于说明。本文所呈现的结果可被视为对基于导模激发的增强传输现象理解的一项重要贡献。
