發(fā)布時間：2018-12-13 03:03

【摘要】：太赫茲波是指頻率介于0.1THz-10THz(1THz=1012Hz)的電磁輻射。有報道顯示大量半導(dǎo)體的子帶和微帶能量都處于太赫茲范圍,眾多生物大分子的共振和轉(zhuǎn)動能級躍遷頻率也都在太赫茲頻段內(nèi)有所分布,因此太赫茲輻射具有獨特的光譜分辨能力。而且太赫茲輻射光子能量小,不會對物質(zhì)造成結(jié)構(gòu)性損害,基于以上特點,以太赫茲輻射為基礎(chǔ)的太赫茲時域光譜技術(shù)作為一門新興的檢測技術(shù)在物質(zhì)分辨方面有著優(yōu)異的表現(xiàn),在生物醫(yī)學(xué)、安全檢查、文物鑒定等領(lǐng)域有著廣闊的應(yīng)用前景。本文研究的是基于碲化鋅晶體光學(xué)整流和電光采樣的太赫茲時域光譜系統(tǒng),文章的主要內(nèi)容安排如下。第一章,研究背景介紹及國內(nèi)外研究概述。簡要說明“太赫茲間隙”的位置及來由,簡單介紹國內(nèi)外太赫茲研究風(fēng)潮以及太赫茲輻射的獨特性質(zhì)及應(yīng)用。第二章,太赫茲的產(chǎn)生方法及激發(fā)源。根據(jù)激發(fā)方式的不同,將涉及的產(chǎn)生方法分為光子學(xué)和電子學(xué)兩大類分別介紹。第三章,時域光譜系統(tǒng)原理的介紹。首先從麥克斯韋方程組出發(fā)得出光致極化過程中輻射的電磁脈沖遠(yuǎn)場解,由其來推演在碲化鋅晶體光學(xué)整流中輻射電磁脈沖的電場形式。然后對非線性晶體中的線性光電效應(yīng)進(jìn)行深入的分析,此效應(yīng)被用在碲化鋅晶體中的電光采樣探測中。第四章,實驗數(shù)據(jù)分析。首先介紹一下太赫茲時域光譜系統(tǒng)的光路設(shè)計,然后通過時域光譜系統(tǒng)對水蒸氣在太赫茲波段內(nèi)的吸收進(jìn)行探究。接下來測量咖啡等有機(jī)飲品的透射譜線,分析譜線得到的結(jié)果。測量硅片及硅片襯底ITO薄膜的透射譜,所測結(jié)果與理論模擬結(jié)果吻合良好。最后,對硅襯底納米薄膜在各特殊角的情形下獲得的特殊性質(zhì)進(jìn)行了理論模擬。
[Abstract]:Terahertz waves are electromagnetic radiation with a frequency of between 0.1THz-10THz (1THz=1012Hz). It has been reported that a large number of semiconductor subbands and microstrip energies are in the terahertz range, and the resonant and rotational energy transition frequencies of many biological macromolecules are also distributed in the terahertz band. Thus terahertz radiation has a unique spectral resolution. And because terahertz radiation photons are small in energy and do not cause structural damage to matter, based on these characteristics, Terahertz time-domain spectroscopy based on terahertz radiation has excellent performance in matter resolution as a new detection technology. It has a broad application prospect in biomedicine, safety inspection, cultural relic identification and so on. The terahertz time-domain spectroscopy system based on optical rectification and electro-optic sampling of zinc telluride crystal is studied in this paper. The main contents of this paper are as follows. The first chapter, the research background and domestic and foreign research overview. This paper briefly describes the position and reason of "terahertz gap", and briefly introduces the unique properties and applications of terahertz research and terahertz radiation at home and abroad. The second chapter, the generation method and excitation source of terahertz. According to the different modes of excitation, the methods involved are divided into photonics and electronics. Chapter three introduces the principle of time domain spectrum system. The far-field solution of electromagnetic pulse radiation in the process of photopolarization is obtained from Maxwell's equations, from which the electric field form of radiated electromagnetic pulse in optical rectifier of zinc telluride crystal is deduced. Then the linear photoelectric effect in the nonlinear crystal is analyzed, which is used in the electrooptic sampling detection of zinc telluride crystal. Chapter four, experimental data analysis. The optical path design of terahertz time-domain spectrum system is introduced, and then the absorption of water vapor in terahertz band is studied by time-domain spectroscopy system. Then the transmission lines of organic drinks such as coffee were measured and the results were analyzed. The transmission spectra of ITO films on silicon substrates and on silicon substrates are measured and the results are in good agreement with the theoretical simulation results. Finally, the special properties of silicon substrate nanocrystalline films at different angles are theoretically simulated.
【學(xué)位授予單位】：蘇州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN304.22

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