Abstract
By generalizing the concept of spoof surface Plasmons (Science 305, 847), we analytically demonstrate that subwavelength quarter-wave and half-wave plates can be realized in a metal hole array (MHA) sandwiched by two thin-layer materials, whose optical responses can be characterized by their optical conductivities. These abilities of polarization conversion can be attributed to the novel eigenstates induced by the hybridization of the spoof surface plamsons with the current generated in the thin-layer. Due to this mechanism, the robustness of the system is promised. The analytic predictions are verified numerically by modeling the thin-layer material as an experimentally feasible topological-insulator/SiO2 multilayer. Moreover, the possibility of extending the principle to a broad range of materials is dicussed.
Highlights
Manipulation of the polarization of Terahertz wave in subwavelength regime Xiao Xiao, Ho Ming Leung, C
By generalizing the concept of spoof surface Plasmons (Science 305, 847), we analytically demonstrate that subwavelength quarter-wave and half-wave plates can be realized in a metal hole array (MHA) sandwiched by two thin-layer materials, whose optical responses can be characterized by their optical conductivities
These abilities of polarization conversion can be attributed to the novel eigenstates induced by the hybridization of the spoof surface plamsons with the current generated in the thin-layer
Summary
Giwvhbae~leyr,eX WIaa~ac2nmcd,nIk,Csi ,sDai bDdaenI koI mkte,in,ts,hsi EeEfDiieI knldmds,inco,asfteasawEtahvgeeigvcueosidutephlmeincogodueopafltintthgheebienitncwcideideenenntdtainfffdeierltedrnatnaswnmadvitettgehudeidsieademswooadfveMesgHuatiAdtehreemsgpioevdceten-, m,n,s eiqaz hze{iqaz h side of MHA, Sa~Ya eiqazh{e{iqazh is due to the bouncing back and forth of the a waveguide mode in holes, GVa. Sba;n^i ~hajn^i|jbi is the coupling between different waveguide modes in the presence of optical Hall currents in the lower (i 5 1) or upper In the above expressions,cm,n,s and Ya are the admittances of the grating modes and waveguide modes,jaæ denotes the tgaunidgeenmtioaldceo, mI kpmo,nn,senEt (parallel indicates to the metal surface) of the a wavethe tangential component of grating modes in open space, the Bra-notation indicates the complex conjugate of the corresponding modes, n^i is an unit vector, which together with the electric field determines the direction of Hall cur-. I rent ( J xy~sxyn^i|E) in the lower or upper thin-layer, and the inner products in the expressions are obtained by integrating the product over the unit cell
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