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Control of propagation velocity of sub-picosecond electrical signals on the micro strip lines involving quantum wells

涉及量子阱的微带线上亚皮秒电信号传播速度的控制

基本信息

批准号：
15560032
负责人：
KADOYA Yutaka
金额：
$ 2.37万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560032/
关键词：
ultrafast optical response sub-picosecond electrical signals mirco stlip lines semiconductor quantum well THz electromagnetic waves transparent conductor

项目摘要

The major aim of this project was the control of propagation velocity of sub-picosecond electrical signals on micro strip lines (MSLs) involving semiconductor quantum wells, where electrons and holes are generated by with, for example, optical excitation. Along with the fabrication of the devices and the measurements, three-dimensional calculations of the electromagnetic fields were performed by using finite-difference-time-domain (FDTD) software. The major results are as follows.(1)It was found that the electrical signals observed, at the beginning of this project, in the MSLs made on semiconductor substrates are those waveguided only by the single signal line formed on the substrate surface. The waveguiding by single metallic lines has been reported in microwave and optical regimes. The strip lines in THz-frequency regime, where the real and imaginary parts of the complex conductivity of metals have the values in the same level, can be a good system for the investigation on the influ … More ence of surface plasmons on the electromagnetic waveguides. We also found that the attenuation and the dispersion of the signals along the single metallic line can be even lower than the conventional MSLs, if the line is covered by a uniform dielectric films. Hence we can expect the application of single-line waveguides in the future.(2)We successfully fabricated the MSLs where the ground plane is made of an optically-transparent conductor, ITO. In such MSLs, optical access into the region between the signal line and the ground plane is possible. It was confirmed, experimentally, that the signals whose spectral range is below 1 THz can be transmitted for more than 1 mm with good propagation characteristics. We also showed that the use of Drude model for ITO is necessary for the precise prediction of the propagation characteristics in the frequency higher than 1 THz, on the basis of the FDTD calculation.(3)It was experimentally verified that the transmission of sub-picosecond electrical signals over a few mm is possible in the thin film MSLs in which the polymer dielectric is used.(4)Methods for embedding semiconductor quantum wells in the MSL described above were established. In the measurement, the control of the propagation velocity was not observed, mostly because of the insufficient excitation of electrons and holes. However, since the device fabrication method established in this work has a good versatility, we can expect the progress for realizing functional MSLs in future. Less

该项目的主要目标是控制涉及半导体量子阱的微带线（MSL）上亚皮秒电信号的传播速度，其中电子和空穴是通过光激发等产生的。在制造设备和测量的同时，还使用时域有限差分 (FDTD) 软件进行电磁场的三维计算。主要结果如下：(1)发现在本项目开始时，在半导体衬底上制作的MSL中观察到的电信号是仅由衬底表面上形成的单条信号线波导的电信号。单金属线的波导已在微波和光学领域得到报道。太赫兹频率范围内的带状线，其中金属复电导率的实部和虚部具有相同水平的值，可以成为研究表面等离子体激元对电磁波导的影响的良好系统。我们还发现，如果单根金属线被均匀的介电膜覆盖，信号的衰减和色散甚至可以低于传统的 MSL。因此我们可以期待单线波导在未来的应用。(2)我们成功地制备了MSL，其中接地面由光学透明导体ITO制成。在此类 MSL 中，可以通过光学方式接入信号线和接地平面之间的区域。实验证实，光谱范围低于1 THz的信号可以传输1毫米以上，且具有良好的传播特性。我们还表明，在FDTD计算的基础上，使用ITO的Drude模型对于精确预测高于1 THz频率下的传播特性是必要的。(3)实验验证了在使用聚合物电介质的薄膜MSL中可以实现数毫米内的亚皮秒电信号传输。(4)嵌入半导体量子阱的方法在上面描述的MSL中建立。在测量中，没有观察到传播速度的控制，主要是因为电子和空穴的激发不充分。然而，由于这项工作中建立的器件制造方法具有良好的通用性，我们可以期待未来在实现功能性MSL方面取得进展。较少的