摘要
光电导和光整流是目前应用较为广泛的两种重要的太赫兹辐射产生技术,太赫兹波导传输对太赫兹技术的发展也非常重要。本论文主要研究了光电导和光整流太赫兹源的辐射原理、影响因素和改进方法,模拟了几种材料的太赫兹波导的传输特性。
在对光电导太赫兹源的研究中,首先从光电导开关的发展历程入手,讨论了国内外应用光电导开关作为太赫兹辐射源产生的太赫兹波达到的水平,然后对光电导THz源的辐射原理进行了深入研究,探讨了影响光电导太赫兹源辐射的三个主要因素:光导体、天线几何结构和泵浦激光脉冲宽度。目前在光电导太赫兹源研究中存在的主要问题是辐射波的能量和频率都较低,提出了今后可从光导体、天线几何结构和其他方面提高光电导太赫兹源辐射的强度和频率。
在解释光整流效应的基础上,本论文讨论了国内外应用光整流作为太赫兹辐射源产生的太赫兹波的研究进展,研究了光整流THz源的辐射原理:非线性极化。目前在光整流太赫兹源研究中存在的主要问题是:在非线性晶体中实现相位匹配十分困难,所以辐射的太赫兹波强度较低,提出了提高光整流太赫兹源辐射强度的几种方法。
太赫兹波的传输和操控的研究是一些太赫兹技术能否广泛应用的关键。本文用CST微波工作室软件包模拟了石英、硅、Teflon和HDPE四种材料的太赫兹波导的传输特性,分析了这几种波导结构在太赫兹波段的S参数、端口处的传输场能量、端口处的电场和磁场、整个波导的三维法线分量电场分布和波导的三维切线分量电场分布等。结果表明,在传输的太赫兹波的频率不太高和波导的几何尺寸不太大时,这几种材料可以作为太赫兹波段的波导传输太赫兹波。
At present,photoconductive switches and optical rectification are the two important and widespread methods of terahertz radiation generation. THz waveguide propagation is also very important in the development of THz technology. This paper studied radiation principle, the influence factors and the improvement methods of the photoconductivity and optical rectification THz radiation sources .The transmission characteristics of several materials terahertz waveguide had also been simulated.
In the research of photoconductive THz sources ,at first,the development process of the photoconductive switch was introduced and then the level of THz wave generated by photoconductive switches at home and abroad were discussed. The principle of photoconductive THz sources was studied in-depth. The three primary factors: photoconductor, antenna geometry structure and the width of pump laser pulse which impact the radiation of photoconductive THz sources were explored. At present the main question which exists in the research of photoconductive THz sources is that the wave energy and frequency are low. And the radiation intensity and frequency can be improved from the aspects such as photoconductor, the antenna geometry structure and other areas.
On the basis of explaining optical rectification effect , the level of THz wave generated by optical rectification at home and abroad were discussed in this paper. The radiation principle: non-linear polarization had been studied thoroughly. At present the main question which exists in the research of optical rectification THz source is that it is very difficult to achieve phase matching in the nonlinear crystal. Therefore, the radiation intensity is too low. Several methods to enhance the intensity of optical rectification THz radiation sources were proposed.
How to transmit and manipulate THz wave are the key of some widespread applications of THz technology. CST Microwave Studio software package was used to simulate Si O_2、Si、Teflon and HDPE THz waveguide's transmission property. These types of waveguide structures' S parameter, energy transfer, port department of electric and magnetic fields,three-dimensional waveguide normal and tangential component of electric field distribution were analysed. The results indicated that these materials can be used as the terahertz waveguide when the transmission frequency is not too high and the waveguide geometric size is not too large.
引文
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