本文選題：太赫茲 + 太赫茲通信�。� 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：近年來被譽為“世紀(jì)前沿革命”的太赫茲技術(shù)成為熱門科研課題。其中太赫茲通信及太赫茲成像是太赫茲技術(shù)研究和應(yīng)用方面的重中之重。太赫茲波的頻率高于現(xiàn)階段微波通信中的載波頻率,隨著人們對無線通信帶寬需求的成倍增長,太赫茲通信必將成為未來高速短距離無線通信和外層空間通信中的重點研究課題。利用太赫茲波特有的性質(zhì),太赫茲成像技術(shù)在環(huán)境監(jiān)測、醫(yī)療診斷、無損探傷、安全檢測和軍用雷達等方面有著廣闊的應(yīng)用前景�，F(xiàn)階段,太赫茲通信主要是基于現(xiàn)有的微波通信技術(shù)在微波段進行信號處理,再倍頻至太赫茲頻段產(chǎn)生調(diào)制信號�；蛘咧苯诱{(diào)控太赫茲源產(chǎn)生振幅、相位、頻率可控的太赫茲波進行調(diào)制。太赫茲成像主要是基于相干成像技術(shù),如太赫茲時域光譜成像。本文基于空間型太赫茲光控調(diào)制器研究了一套太赫茲通信及成像系統(tǒng)。與上述通信及成像方式有不同之處,該系統(tǒng)能夠在空間中直接對太赫茲波進行調(diào)制從而實現(xiàn)空間直接調(diào)制方式的太赫茲通信以及相干太赫茲連續(xù)波成像。首先,本文研究了一種基于硅納米針結(jié)構(gòu)的空間直接調(diào)制光控太赫茲幅度調(diào)制器。發(fā)現(xiàn)該微納結(jié)構(gòu)對太赫茲波相較于半導(dǎo)體硅有明顯的增透作用,可以大大降低太赫茲插入損耗。測得其透射率可以達到85%甚至更高。對黑硅進行研究,制備了調(diào)制深度超過80%,靜態(tài)下可“關(guān)斷”的,空間直接調(diào)制太赫茲調(diào)制器。接著,在太赫茲通信方面。本文采用LaVIEW編程控制數(shù)據(jù)采集卡的方法,實現(xiàn)了信號的A/D轉(zhuǎn)換以及通信過程中基抗干擾能力。為了實帶信號的產(chǎn)生和接收。通信時,運用了2ASK調(diào)制解調(diào)方案,并進行了編碼與解碼以提升現(xiàn)語音實時通信,擴展了語音自動采集、自動傳輸、自動播放程序。另外,在太赫茲成像研究中,本文基于太赫茲通信系統(tǒng)做出相應(yīng)調(diào)整,搭建了一套太赫茲連續(xù)波單像素成像系統(tǒng)。在空間光調(diào)制器的基礎(chǔ)上提出了一種基于黑硅的空間型太赫茲光控幅度調(diào)制器,對太赫茲波的空間分布進行調(diào)控,實現(xiàn)了太赫茲非機械式單像素掃描,獲得了太赫茲空間分布強度信息。并用Matlab將太赫茲強度信息轉(zhuǎn)換為圖像實現(xiàn)成像。最后,本文通過共用設(shè)備和儀器搭建了一套能同時實現(xiàn)太赫茲通信與成像功能的系統(tǒng)。通過傳輸文字、圖片、語音信號對該系統(tǒng)的通信功能進行了驗證,并且成功進行了太赫茲成像實驗。
[Abstract]:In recent years, terahertz technology, known as the "frontier revolution of the century", has become a hot research topic. Terahertz communication and terahertz imaging are the most important in the research and application of terahertz technology. The frequency of terahertz wave is higher than the carrier frequency of microwave communication at the present stage. As the demand for wireless communication bandwidth increases exponentially, Terahertz communication will become an important research topic in future high-speed and short-range wireless communication and outer space communication. Using the properties of terahertz Potter, terahertz imaging technology has a broad application prospect in environmental monitoring, medical diagnosis, nondestructive testing, safety detection and military radar. At present, terahertz communication is mainly based on the existing microwave communication technology to process the signal in the microwave band, and the modulation signal is generated from the frequency doubling to the terahertz band. Or directly adjust the terahertz source to generate amplitude, phase, and frequency controllable terahertz wave modulation. Terahertz imaging is mainly based on coherent imaging techniques, such as terahertz time domain spectroscopy imaging. In this paper, a terahertz communication and imaging system is studied based on space terahertz optical modulator. The system can modulate terahertz wave directly in space so as to realize terahertz communication and coherent terahertz continuous wave imaging. Firstly, a novel optical direct modulation terahertz amplitude modulator based on silicon nanoscale structure is studied. It is found that the micro- and nanocrystalline structure has obvious antireflection effect on terahertz wave compared with semiconductor silicon and can greatly reduce the insertion loss of terahertz. The transmittance can reach 85% or higher. A terahertz modulator with modulation depth over 80, which can be "turned off" in static state, has been fabricated by the study of black silicon. Then, in terms of terahertz communications. In this paper, the method of controlling data acquisition card with LaVIEW programming is used to realize the A- / D conversion of the signal and the ability of anti-jamming in the communication process. For the generation and reception of real band signals. The 2ASK modulation and demodulation scheme is used in the communication, and the coding and decoding are carried out to improve the real time communication of the current voice. The program of automatic voice acquisition, automatic transmission and automatic playback is extended. In addition, in the study of terahertz imaging, a terahertz continuous wave single pixel imaging system is built based on the corresponding adjustment of terahertz communication system. Based on the spatial light modulator, a space-type terahertz photo-controlled amplitude modulator based on black silicon is proposed. The spatial distribution of terahertz wave is regulated, and the terahertz non-mechanical single-pixel scanning is realized. The intensity information of terahertz spatial distribution is obtained. The terahertz intensity information is converted to image by Matlab. Finally, a system for terahertz communication and imaging is set up by using common equipments and instruments. The communication function of the system is verified by transmitting text, picture and speech signal, and the terahertz imaging experiment is carried out successfully.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN92

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