本文選題：表面等離子體 + 低閾值　； 參考：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：隨著信息化進(jìn)程的不斷深入,大容量數(shù)據(jù)通信成為主流,高效的激光器在光纖通信,光電集成電路中應(yīng)用愈加廣泛。有機(jī)—無機(jī)雜化鹵化鉛鈣鈦礦激光器被證明是已知的最高效的激光器,其制備原料為甲基銨鉛鹵化物鈣鈦礦(CH_3NH_3PbX_3),具有成本低、工藝簡單和效率高等優(yōu)點。近年來,關(guān)于鈣鈦礦激光器的研究較多,但如何提高其光學(xué)性能以及降低激光損耗一直難以得到解決。利用金屬納米粒子的局域等離子激元共振的場增強原理可以有效的提高鈣鈦礦激光器的光學(xué)性能,并且制備簡易,增強效果明顯。這種表面等離子體增強的鈣鈦礦激光器在光電子學(xué)等領(lǐng)域有著重要的應(yīng)用價值和發(fā)展前景。本文提出了利用納米金顆粒的局域表面等離子體的共振吸收增強作用,以解決激光器的損耗問題;并在此基礎(chǔ)上選擇溴化鉛鈣鈦礦作為增益介質(zhì),研究了納米金顆粒對激光器性能影響。主要研究內(nèi)容如下:理論分析金納米顆粒的局域表面等離子體增強特性。通過理論計算說明了局域共振等離子激元增強是由兩個因素引起:顆粒內(nèi)部的偶極場以及外加電場作用�；诮鸺{米顆粒的鈣鈦礦激光器實驗樣品的制備。制備出了粒徑均一的納米金顆粒,研究了不同尺寸納米金顆粒的光學(xué)性能,探索了自組裝成納米金單膜的方法,確定了在2 h的自組裝條件下,平均粒徑為43 nm的金顆粒自組裝最佳,從而匹配增益介質(zhì)。同時也制備了發(fā)光性能較好的溴化鉛鈣鈦礦薄膜和鈣鈦礦單晶�；诮鸺{米顆粒的鈣鈦礦微型激光器的制備和性能測試。按照模型分別制備出了基于金納米顆粒的棒狀和片狀鈣鈦礦微型激光器。在不同泵浦能量下測試了同一樣品的同一位置的發(fā)光強度以及閾值曲線,將其與棒狀和片狀鈣鈦礦本身作對照,實現(xiàn)了較鈣鈦礦本身2倍以上的輸出強度,同時實現(xiàn)了閾值10%的降低,即降低了納米激光器的損耗,提高了其發(fā)光效率�；诩{米金/鈣鈦礦薄膜隨機(jī)激光器的制備和性能測試。將納米金顆粒與鈣鈦礦薄膜溶液按特定方式均勻混合,制備出了納米金/鈣鈦礦薄膜隨機(jī)激光器。研究發(fā)現(xiàn)鈣鈦礦的熒光受到金納米顆粒結(jié)構(gòu)的等離激元散射作用被波導(dǎo)反饋,使等離激元散射作用在“光學(xué)反饋腔”的協(xié)同作用下遠(yuǎn)超過其吸收作用,從而實現(xiàn)低閾值激光輸出。
[Abstract]:With the development of information technology, large capacity data communication has become the mainstream. Efficient lasers are widely used in optical fiber communication and optoelectronic integrated circuits.The organic-inorganic hybrid lead halide perovskite laser has been proved to be the most efficient laser known. Its raw material is Ch _ 3NH _ 3NH _ 3PbX _ 3T _ 3s, which has the advantages of low cost, simple process and high efficiency.In recent years, much research has been done on perovskite lasers, but it is difficult to improve their optical properties and reduce laser losses.The field enhancement principle of local plasmon resonance of metal nanoparticles can effectively improve the optical properties of perovskite lasers.This kind of surface plasma-enhanced perovskite laser has important application value and development prospect in optoelectronics and other fields.In this paper, the resonant absorption enhancement of local surface plasmas of gold nanoparticles is proposed to solve the problem of laser loss, and on this basis, lead perovskite bromide is selected as gain medium.The effect of nanocrystalline gold particles on the laser performance was investigated.The main research contents are as follows: the local surface plasma enhancement characteristics of gold nanoparticles are analyzed theoretically.The theoretical calculation shows that the enhancement of local resonance plasmon is caused by two factors: the dipole field inside the particle and the external electric field.Preparation of experimental samples of perovskite laser based on gold nanoparticles.Nanocrystalline gold particles with uniform particle size were prepared. The optical properties of gold nanoparticles of different sizes were studied. The method of self-assembling into nanocrystalline gold monolayers was explored, and the self-assembly conditions for 2 h were determined.The gold particle with an average diameter of 43 nm is the best for self-assembly, which matches the gain medium.At the same time, lead bromide perovskite thin films and perovskite single crystals with good luminescence properties were also prepared.Preparation and performance test of perovskite micro laser based on gold nanoparticles.The rod-like and flake perovskite microlasers based on gold nanoparticles were fabricated according to the model.The luminescence intensity and threshold curve of the same sample at the same position were measured at different pump energies. Compared with the rod-like and flaky perovskite, the output intensity of the perovskite is more than 2 times that of the perovskite itself.At the same time, the threshold value is reduced by 10%, that is, the loss of nanocrystalline laser is reduced and the luminescence efficiency is improved.Based on the preparation and performance test of nanocrystalline gold / perovskite thin film random laser.A nanocrystalline gold / perovskite thin film random laser was prepared by mixing gold nanoparticles with perovskite film solution in a specific way.It is found that the fluorescence of perovskite is fed back by waveguide due to the scattering effect of gold nanoparticles, which makes the scattering action of isoexcitons far exceed its absorption under the synergistic action of "optical feedback cavity".Thus the low threshold laser output is realized.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN248

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