Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, China.
Opt Lett. 2012 Sep 1;37(17):3594-6. doi: 10.1364/OL.37.003594.
We show that the polarization of linearly polarized light can be rotated an arbitrary angle by double-layer metal hole array structures in a subwavelength regime. The transmitted light with the rotated polarization, however, remains of nearly the same strength as the incident field at particular frequencies. The mechanism can be attributed to the subwavelength feature of the rectangular holes, and the tangential guiding modes between layers modulated by the orientation of the holes. The structures have potential applications as polarization rotators in a broad frequency range covering from terahertz (THz) to infrared frequencies.
我们表明，在亚波长范围内，双层金属孔阵列结构可以将线偏振光的偏振旋转任意角度。然而，在特定频率下，旋转偏振后的透射光的强度几乎与入射场相同。这种机制可以归因于矩形孔的亚波长特征以及由孔的取向调制的层间切向导模。这些结构有望在从太赫兹（THz）到红外频率的宽频范围内用作偏振旋转器。
