He Xiaolong, Yang Liu, Yang Tian
University of Michigan- Shanghai Jiao Tong University Joint Institute, National Key Laboratory of Nano/Micro Fabrication Technology, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai, China.
Opt Express. 2011 Jul 4;19(14):12865-72. doi: 10.1364/OE.19.012865.
We have numerically designed a compact structure to concentrate optical waves from a silicon-on-insulator waveguide to a deep sub-wavelength and high intensity surface plasmon focal spot at the tip of a metallic strip taper. A systematic design approach is developed to obtain an optimal photon-surface plasmon side coupling efficiency of up to 50% at 1.55 μm wavelength, and an over 50 times increase in electric field intensity in a focal region of around 20nm × 20nm × 7nm in size. The length of the whole device is 2.2 μm. We expect fabrication of the proposed device to be simpler than devices in previous work.
我们通过数值方法设计了一种紧凑结构，用于将绝缘体上硅波导中的光波集中到金属条锥形尖端处的深亚波长且高强度的表面等离子体焦点上。我们开发了一种系统的设计方法，以在1.55μm波长下获得高达50%的最佳光子 - 表面等离子体侧向耦合效率，并在尺寸约为20nm×20nm×7nm的焦点区域内使电场强度增加50倍以上。整个器件的长度为2.2μm。我们预计所提出器件的制造将比先前工作中的器件更简单。
