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Numerical Analysis and Designs of Terahertz Photomixer and Photoconductive Antennas
- Alternative Title
- 원중캉
- Author(s)
- NGUYEN, TruongKhang
- Alternative Author(s)
- 원중캉
- Advisor
- Park Ikmo
- Department
- 일반대학원 전자공학과
- Publisher
- The Graduate School, Ajou University
- Publication Year
- 2013-02
- Language
- eng
- Alternative Abstract
- Terahertz (THz) science and technology have made significant progress in the past decades. However, the use of THz waves was not fully realized due to the absence of practically suitable and efficient signal sources. The THz radiation can be generated by using short laser pulses or using an optical beat for the pump of the photoconductive antenna. The physical mechanism of the former technique can be divided into two groups, ultrafast surge effects and nonlinear optical effects. The latter technique was preferred to as photomixing or optical heterodyne. A common method to detect THz radiation is through Electro-Optic Sampling (EOS) measurement to determine the THz electric field. In both THz pulsed and CW photomixing systems the antenna is one of the most important elements to couple radiation into or collect radiation from free space. However, an efficient antenna design for THz applications has been a difficult subject of huge interest. The effort on new kinds of integrated antennas with new devices in order to increase the power and the efficiency of the radiated structured is the main goals of our work. In this work, we numerically studied and investigated the characteristics of several antenna types for both THz pulsed and CW photomixing systems. We proposed some antenna design which obtaining high total efficiencies to partly solve the low output problem. Besides, the issue of improved antenna directivity was also particular considered in this work. This work was completed with a special topics of photoconductive antenna used in a THz pulsed system. The results that we obtained contribute in providing a more throughout understanding about the important role of antenna in the radiation of the THz waves.
- Fulltext
- Appears in Collections:
- Graduate School of Ajou University > Department of Electronic Engineering > 3. Theses(Master)
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