Opt Lett. 2014 Feb 1;39(3):697-700. doi: 10.1364/OL.39.000697.
We investigate numerically a novel plasmonic polarization converter relying on the excitation of a so-called dihedron dielectric loaded plasmon polariton. The dihedron dielectric loaded waveguide consists of a dielectric ridge implemented at the inner corner of a metal-coated dielectric step. For a dielectric ridge with a square cross section, the plasmon polariton modes supported by each side of the metallized step hybridize to create supermodes with crossed polarizations. We show that the two supermodes can be operated in a dual-mode interferometer configuration to perform an efficient (24 dB) TE-TM/TM-TE polarization conversion over typical distances below 30 μm at telecommunications wavelengths. In addition, on the basis of the thermo-optical properties of our device, we find that the dihedron plasmonic polarization converter is temperature insensitive.
我们通过数值研究了一种新颖的基于所谓的二面体介质加载等离子体激元激发的等离子体极化转换器。二面体介质加载波导由金属覆盖的介质阶跃内角处的介质脊构成。对于具有正方形横截面的介质脊，由金属化阶跃的每一侧支撑的等离子体激元模式可以混合以创建具有交叉极化的超模式。我们表明，两个超模式可以在双模干涉仪配置中操作，以在典型的低于 30 μm 的电信波长距离内实现高效（24 dB）TE-TM/TM-TE 偏振转换。此外，基于我们器件的热光特性，我们发现二面体等离子体极化转换器对温度不敏感。
