本文選題：鐵酸鉍薄膜 + 異質(zhì)結(jié)構(gòu)　； 參考：《國防科學(xué)技術(shù)大學(xué)》2014年碩士論文

【摘要】：多鐵材料鐵酸鉍(BiFeO_3)具有明顯的雙折射色散性質(zhì),薄膜異質(zhì)結(jié)構(gòu)的低維復(fù)合特性使其光物理性質(zhì)更加豐富,因此研究BiFeO_3薄膜及其異質(zhì)結(jié)構(gòu)的電光效應(yīng)并探索其在信息存儲器件方面的應(yīng)用具有重要意義。本文主要研究了BiFeO_3薄膜及其異質(zhì)結(jié)構(gòu)的電光效應(yīng),設(shè)計了一種基于BiFeO_3/Au薄膜異質(zhì)結(jié)構(gòu)電光效應(yīng)的信息存儲器件,實驗制備了Au/BiFeO_3/LaAlO_3異質(zhì)結(jié)構(gòu)并研究了其電光效應(yīng)。本文主要內(nèi)容如下:1.概述了當(dāng)前主要信息存儲方式,總結(jié)了電光效應(yīng)和電光晶體,說明BiFeO_3電光性質(zhì)的優(yōu)勢及其在信息存儲器件方面的應(yīng)用價值,介紹了選題背景和意義。2.設(shè)計了BiFeO_3/金屬薄膜異質(zhì)結(jié)構(gòu),仿真計算了不同BiFeO_3薄膜厚度、入射角度的BiFeO_3/Au和BiFeO_3/Pt異質(zhì)結(jié)構(gòu)的光譜曲線和電光效應(yīng),發(fā)現(xiàn)了明顯的共振吸收現(xiàn)象和電光調(diào)制特性,分析了各參數(shù)對膜系結(jié)構(gòu)共振吸收的影響。3.基于BiFeO_3/Au異質(zhì)結(jié)構(gòu)顯著的電光調(diào)制特性,結(jié)合鐵電存儲器的信息寫入優(yōu)勢和光存儲器的信息讀出優(yōu)勢,設(shè)計了一種基于BiFeO_3/Au薄膜異質(zhì)結(jié)構(gòu)的“電寫入,光讀取”的信息存儲器件。提出了存儲器件的設(shè)計思路、原理以及結(jié)構(gòu)組成,總結(jié)了存儲器件的優(yōu)點和實施方法;設(shè)計了基于透明導(dǎo)電玻璃ITO(indium-tin oxide)電極的信息寫入方式。4.用脈沖激光鍍膜方法制備了BiFeO_3/LaAlO_3薄膜異質(zhì)結(jié)構(gòu),用橢圓偏振光譜測量方法研究其光學(xué)特性;用光刻技術(shù)和磁控濺射方法鍍制了叉指結(jié)構(gòu)Au電極,對BiFeO_3薄膜施加電壓,發(fā)現(xiàn)了Au/BiFeO_3/LaAlO_3膜系結(jié)構(gòu)的電光效應(yīng),并對其進行了細致的實驗研究和分析。
[Abstract]:BiFeO _ 3) has obvious birefringent dispersion, and its photophysical properties are more abundant due to the low dimensional recombination of the heterostructure of the thin film. Therefore, it is of great significance to study the electro-optic effects of BiFeO_3 thin films and their heterostructures and to explore their applications in information storage devices. In this paper, the electro-optic effects of BiFeO_3 thin films and their heterostructures are studied, and an information storage device based on the electro-optic effects of BiFeO_3/Au thin films heterostructure is designed. The Au/BiFeO_3/LaAlO_3 heterostructures are fabricated experimentally and their electro-optic effects are studied. The main contents of this paper are as follows: 1. This paper summarizes the main information storage methods, summarizes electro-optic effect and electro-optic crystal, explains the advantages of electro-optic properties of BiFeO_3 and its application value in information storage devices, and introduces the background and significance of the selected topic. The heterostructure of BiFeO_3/ metal film is designed. The spectral curves and electro-optic effects of BiFeO_3/Au and BiFeO_3/Pt heterostructures with different BiFeO_3 film thickness and incident angle are calculated and the resonance absorption and electro-optic modulation characteristics are found. The influence of various parameters on the resonance absorption of the membrane system was analyzed. Based on the remarkable electro-optic modulation characteristics of BiFeO_3/Au heterostructure, combining the advantages of ferroelectric memory and optical memory information readout, a kind of information storage device based on BiFeO_3/Au thin film heterostructure is designed. The design idea, principle and structure of the memory device are presented, the advantages and implementation of the memory device are summarized, and the information writing method based on transparent conductive glass ITO(indium-tin oxide electrode is designed. 4. The heterostructure of BiFeO_3/LaAlO_3 thin film was prepared by pulsed laser deposition, and its optical properties were studied by elliptical polarization spectroscopy. Au electrode with cross finger structure was deposited by photolithography and magnetron sputtering, and the voltage was applied to the BiFeO_3 film. The electro-optic effect of Au/BiFeO_3/LaAlO_3 film system was found, and its detailed experimental study and analysis were carried out.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TP333;O484

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