本文選題：BNT鐵電薄膜 + 非線(xiàn)性光學(xué)�。� 參考：《湘潭大學(xué)》2015年碩士論文

【摘要】：非線(xiàn)性光學(xué)材料因其在信號(hào)處理、超快光通信、數(shù)據(jù)存儲(chǔ)、光限幅器件、邏輯器件、光開(kāi)關(guān)、圖像傳輸和微加工等領(lǐng)域的應(yīng)用而受到廣泛的關(guān)注。目前,非線(xiàn)性光學(xué)材料的研究進(jìn)展很大程度上取決于新的具有強(qiáng)非線(xiàn)性光學(xué)效應(yīng)材料的發(fā)現(xiàn)以及對(duì)非線(xiàn)性光學(xué)性能的改進(jìn)。鐵電薄膜具有高的透過(guò)率、快的響應(yīng)速度和大的非線(xiàn)性光學(xué)系數(shù),是一類(lèi)優(yōu)異的非線(xiàn)性光學(xué)材料,有望在未來(lái)應(yīng)用于光子器件。本文利用單光束Z掃描方法測(cè)試了Bi3.15Nd0.85Ti3O12(BNT)鐵電薄膜在飛秒激光作用下的超快三階非線(xiàn)性光學(xué)性能,并對(duì)其非線(xiàn)性光吸收特性進(jìn)行了調(diào)控,主要的研究工作和結(jié)果如下:1.飛秒激光單光束Z掃描測(cè)試系統(tǒng)的搭建為了研究BNT鐵電薄膜的非線(xiàn)性光學(xué)性能,我們基于波長(zhǎng)800 nm、脈寬300fs的鈦寶石飛秒激光系統(tǒng)搭建了單光束Z掃描測(cè)試系統(tǒng),并通過(guò)CS2標(biāo)準(zhǔn)樣品和石英襯底的測(cè)試檢驗(yàn)了系統(tǒng)的可靠性和穩(wěn)定性。2.BNT薄膜的超快三階非線(xiàn)性光學(xué)性能研究首先,采用溶膠-凝膠方法在石英襯底上制備了BNT薄膜,表征了其晶體結(jié)構(gòu)和線(xiàn)性光學(xué)性能。結(jié)果顯示,所制備的BNT薄膜呈a-軸擇優(yōu)取向生長(zhǎng),具有高的光學(xué)透過(guò)率和大的禁帶寬度。然后,利用上述搭建的單光束Z掃描系統(tǒng)測(cè)試了BNT薄膜的非線(xiàn)性光吸收和光折射特性,發(fā)現(xiàn)BNT薄膜在飛秒激光作用下具有大的三階非線(xiàn)性光學(xué)系數(shù),其雙光子吸收系數(shù)為1.15×102 cm/GW,三階非線(xiàn)性折射率為-8.15×10-3 cm2/GW。分析認(rèn)為,BNT薄膜的超快雙光子吸收效應(yīng)是一個(gè)間接的電子躍遷過(guò)程,其大的非線(xiàn)性光折射系數(shù)可能是電子極化和鐵電極化共同作用的結(jié)果。3.BNT薄膜的三階非線(xiàn)性光吸收特性的調(diào)控研究首先,采用脈沖激光沉積法在石英襯底上制備了不同厚度(106.8 nm,139.7nm和312.9 nm)的BNT薄膜,表征了其晶體結(jié)構(gòu)和線(xiàn)性光學(xué)性能。結(jié)果顯示,所制備的BNT薄膜呈c-軸擇優(yōu)取向生長(zhǎng);隨著薄膜厚度的增加,禁帶寬度從4.02eV減小到3.68 eV。然后,通過(guò)開(kāi)孔Z掃描測(cè)試研究了薄膜厚度對(duì)BNT薄膜非線(xiàn)性光吸收特性的影響。發(fā)現(xiàn),隨著薄膜厚度的增加,BNT薄膜的非線(xiàn)性吸收從飽和吸收轉(zhuǎn)變?yōu)榉达柡臀?隨著薄膜厚度的進(jìn)一步增加,其反飽和吸收性能增強(qiáng)。分析認(rèn)為,BNT薄膜的三階非線(xiàn)性光吸收轉(zhuǎn)變可能是基態(tài)激發(fā)和雙光子吸收之間競(jìng)爭(zhēng)的結(jié)果,這種競(jìng)爭(zhēng)可以通過(guò)禁帶寬度和缺陷態(tài)濃度進(jìn)行調(diào)控。
[Abstract]:Nonlinear optical materials are widely used in signal processing, ultra-fast optical communication, data storage, optical limiter, logic devices, optical switches, image transmission and micro-processing. At present, the research progress of nonlinear optical materials depends to a great extent on the discovery of new materials with strong nonlinear optical effects and the improvement of nonlinear optical properties. Ferroelectric thin films have high transmittance, fast response speed and large nonlinear optical coefficients. Ferroelectric thin films are a kind of excellent nonlinear optical materials, which are expected to be used in photonic devices in the future. In this paper, the ultrafast third-order nonlinear optical properties of Bi3.15Nd0.85Ti3O12 BNTs under femtosecond laser are measured by a single beam Z-scan method. The nonlinear optical absorption characteristics of Bi3.15Nd0.85Ti3O12BNTs are regulated. The main work and results are as follows: 1. In order to study the nonlinear optical properties of BNT ferroelectric thin films, a femtosecond femtosecond laser system based on wavelength 800nm and pulse width 300fs has been constructed. The reliability and stability of the system were tested by CS2 standard samples and quartz substrates. Secondly, the ultrafast third-order nonlinear optical properties of BNT thin films were investigated. Firstly, BNT thin films were prepared on quartz substrates by sol-gel method. The crystal structure and linear optical properties were characterized. The results show that the prepared BNT thin films exhibit a- axis preferred orientation, high optical transmittance and wide band gap. Then, the nonlinear optical absorption and refraction characteristics of BNT thin films are tested by using the single beam Z-scan system. It is found that BNT thin films have large third-order nonlinear optical coefficients under femtosecond laser. The two-photon absorption coefficient is 1.15 脳 10 ~ (2) cm / GW, and the third-order nonlinear refractive index is -8.15 脳 10 ~ (-3) cm ~ (-2) GW. It is considered that the ultrafast two-photon absorption effect of BNT thin films is an indirect electron transition process. Its large nonlinear photorefractive coefficient may be the result of the interaction of electron polarization and iron polarization. 3. The regulation of the third-order nonlinear optical absorption characteristics of BNT thin films. BNT thin films with different thickness (106.8 nm ~ 139.7 nm and 312.9 nm) were prepared on quartz substrate by pulsed laser deposition. The crystal structure and linear optical properties of the films were characterized. The results show that the prepared BNT thin films are c-axis oriented, and the band gap decreases from 4.02eV to 3.68eV with the increase of the thickness of the films. Then, the effect of film thickness on the nonlinear optical absorption of BNT thin films was studied by Z scan. It is found that the nonlinear absorption of BNT films changes from saturation absorption to reverse saturation absorption with the increase of film thickness, and the reverse saturation absorption property increases with the further increase of film thickness. It is considered that the third-order nonlinear optical absorption transition of BNT films may be the result of competition between ground state excitation and two-photon absorption, which can be regulated by the band gap and the concentration of defect states.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB383.2

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