Surface-Plasmon Waveguides as Transmission Lines for Optical Signal and Electrical Bias
Surface-Plasmon Waveguides as Transmission Lines for Optical Signal and Electrical Bias
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DOI：
10.1109/jlt.2014.2357801
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发表时间：
2014-12
影响因子：
4.7
通讯作者：
M. Fukuhara;M. Ota;A. Takeda;T. Aihara;H. Sakai;Y. Ishii;M. Fukuda
中科院分区：
文献类型：
--
作者：
M. Fukuhara;M. Ota;A. Takeda;T. Aihara;H. Sakai;Y. Ishii;M. Fukuda
在硅基器件中，利用金属等离子体波导作为光信号的传输线和电偏压是可行的，在波导和Au/Si肖特基势垒二极管（SBD）之间形成隔离间隙。通过计算波导边缘的辐射图案和测量SBD处检测到的光电流来确认光信号传输。从时域有限差分模拟，从波导边缘的辐射图案表示为干涉条纹。模拟结果与实验结果吻合较好。此外，在3 μ m长的隔离间隙上还观察到了10 MHz的强度调制光信号。通过在波导和Si衬底之间施加偏置电压并通过波导产生偏置电流来确认电偏置分离。在SBD检测到的光电流几乎没有增加与改变偏置电压，明显小于在光强度的变化。此外，电流对波导上的表面等离子体激元信号没有影响。
Using metal plasmonic waveguides as transmission lines for optical signals and an electrical bias is shown to be feasible in Si-based devices with a separation gap formed between the waveguide and Au/Si Schottky-barrier diode (SBD). Optical signal transmission is confirmed by calculating the radiation pattern from the waveguide edge and measuring the photocurrent detected at the SBD. From a finite-difference time-domain simulation, the radiation pattern from the waveguide edge is represented as an interference fringe. The simulation result for the separation-length dependence of the detected photocurrent at the SBD corresponds well with experiment. Moreover, the intensity-modulated optical signal at 10 MHz is also observed across the 3-μm-length separation gap. The electrical bias separation is confirmed by applying a bias voltage between the waveguide and the Si substrate and generating a bias current through the waveguide. The detected photocurrent at the SBD barely increased with changing bias voltage and was clearly smaller than that under changes in optical intensity. In addition, electrical current produced no influence on the surface-plasmon signal on the waveguide.