本文選題：金屬等離激元 + 激子極化激元　； 參考：《南京大學(xué)》2015年碩士論文

【摘要】：在過去的二十年里平板微腔中激子和光子的耦合一直是人們研究的熱點。最開始是用分布式布拉格反射鏡(DBRs)作為反射面形成的微腔,后來出現(xiàn)用金屬鏡代替DBRs。相比其他各種平板微腔,半導(dǎo)體微腔在激子和光子耦合的研究和應(yīng)用中有極大的優(yōu)勢,它同時提供了光學(xué)限制腔和激子。而且隨著納米材料制備技術(shù)的進步,半導(dǎo)體微腔制備工藝簡單,品質(zhì)質(zhì)量高,形式結(jié)構(gòu)多樣等優(yōu)點進一步突顯出來了。由于具有大的激子束縛能(-60meV)氧化鋅材料構(gòu)成的微腔在室溫下就能實現(xiàn)激子極化激元,在光電子器件和半導(dǎo)體激光器等領(lǐng)域展現(xiàn)出極大的應(yīng)用前景。另一方面,金屬表面等離激化基元(SPPs)可以打破衍射極限的限制,為亞波長光學(xué)研究打開了大門。已有研究發(fā)現(xiàn),在半導(dǎo)體微腔中引入SPPs會對半導(dǎo)體微腔的光學(xué)性質(zhì)產(chǎn)生很大的影響。我們用不同的生長機制制備了氧化鋅納米線和微米棒。最終我們選用直徑達到幾微米的氧化鋅微米棒作為光學(xué)微腔。通過把氧化鋅微米棒轉(zhuǎn)移到四電極銀襯底上,做出一半懸空一半與金屬銀襯底接觸的實驗樣品。用共聚焦顯微鏡測量得到同一個氧化鋅微米棒底面分別與金屬銀接觸和不接觸的相鄰兩點處的光致發(fā)光光譜。通過光譜圖中的共振模式可以得到兩處的色散曲線。我們引入激子極化激元理論中描述激子光子相互作用中的振子強度增強倍數(shù)的參數(shù)Γ,發(fā)現(xiàn)當取合適的數(shù)值時,我們從光譜圖得到的實驗上的色散關(guān)系和激子極化激元理論上的色散關(guān)系吻合的很好。這說明了在室溫下,我們的樣品中激子和F-P腔模式中的光子發(fā)生了很強的耦合作用。而且我們發(fā)現(xiàn)和金屬銀襯底接觸和懸在空氣中的相鄰兩點處的振子強度增強倍數(shù)11分別是1.96和1.68。可以發(fā)現(xiàn)金屬銀襯底增強了激子和光子的耦合。我們也測量到了垂直入射時氧化鋅金屬銀界面的反射相位,在416rnm波長時是-0.77π,這與我們從折射率數(shù)據(jù)庫查到的空氣銀界面在相同波長-0.72π反射相位很相近。
[Abstract]:The coupling of excitons and photons in plate microcavities has been a hot topic in the past two decades. At first, distributed Bragg reflector (DBRs) was used as the reflection surface of microcavity, then metal mirror was used instead of DBRs. Compared with other planar microcavities, semiconductor microcavities have great advantages in the research and application of exciton and photon coupling, which provide both optical confinement resonators and excitons at the same time. Along with the progress of preparation technology of nanomaterials, the advantages of simple preparation process, high quality and various forms of semiconductor microcavity have been further highlighted. Because the micro-cavity with large exciton binding energy (-60 MEV) zinc oxide can realize the exciton polarization at room temperature, it has shown great application prospect in the fields of optoelectronic devices and semiconductor lasers. On the other hand, the SPPs can break the limit of diffraction limit and open the door for the study of subwavelength optics. It has been found that the introduction of SPPs into semiconductor microcavities has great influence on the optical properties of semiconductor microcavities. Zinc oxide nanowires and micron rods were prepared by different growth mechanisms. Finally, we choose zinc oxide micron rod with diameter of several microns as optical microcavity. By transferring zinc oxide micron rods onto a four-electrode silver substrate, an experimental sample of half suspended and half in contact with the metal silver substrate was made. The photoluminescence spectra of the two adjacent two points of the same zinc oxide micron rod surface in contact with and without contact with silver were measured by confocal microscope. Two dispersion curves can be obtained by resonant modes in the spectrogram. In this paper, we introduce the parameter 螕 to describe the intensity enhancement multiple of the oscillator in the exciton photon interaction by introducing the exciton polarization theory. It is found that when the appropriate numerical value is taken, The experimental dispersion relation obtained from the spectral diagram is in good agreement with the theoretical dispersion relationship of exciton polariton. This shows that the exciton in our sample and the photons in the F-P cavity mode are strongly coupled at room temperature. Furthermore, we find that the intensities of the oscillator in contact with and suspended in the air at two adjacent points are 1.96 and 1.68 respectively. It can be found that the coupling of excitons and photons is enhanced by metallic silver substrates. We have also measured the reflection phase of the interface of zinc oxide metal silver at the vertical incidence, which is -0.77 蟺 at the 416rnm wavelength, which is very close to the reflection phase of the air-silver interface found from the refractive index database at the same wavelength -0.72 蟺.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ132.41
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本文編號：2065153