臺灣博碩士論文加值系統

在此論文中，我研究利用脈衝雷射沉積技術所製作，具有十個週期結構且成長在c平面藍寶石基板上「氧化鋅/氧化鎂鋅多層量子井」的受激輻射光之偏振特性。其中量子井跟壁障的厚度分別約為2.5奈米和13.1奈米。接著，使用波長266奈米的Q開關脈衝雷射且重複頻率約10赫茲的脈衝激發樣品，可以觀察到多層量子井由「激子-激子散射」所產生的受激輻射光譜。在量子井邊緣輻射的量測中，我使用柱狀透鏡將泵激光脈衝聚焦在多層量子井上，使聚焦光束呈現長條紋，透過旋轉線性偏振片，量測受激輻射光的電場分量，證實受激輻射光為線性偏振的狀態，且偏極率大約為0.95，其中受激輻射光的電場方向與氧化鋅的c軸垂直，然而輻射光子的能量固定在3.287 eV左右；接著在較低泵激功率狀態下，發現量子井的自發輻射光不具有偏振的特性，並且證實由A-band到C-band的輻射光，其光子能量位移了35 meV。另外，我也使用柱狀透鏡進行多層量子井正向輻射之量測，發現量子井的受激輻射光仍具有偏振的特性，其偏極率約0.85，且受激輻射光的偏振方向與聚焦在樣品之長條紋互相垂直，但是與泵激光的偏振態無關，因此將此線性偏振受激輻射光的產生歸咎於波導的效應所造成光的侷限；為了證明波導效應對偏振的影響，我使用平凸球面透鏡來取代柱狀透鏡，可以將輻射光的偏極率下降到0.42。由於所使用的低重複頻率下的Q開關雷射，其輸出光束品質並不是一個完美的高斯分佈，因此部分的光波導效應使得受激輻射光仍具有部分偏振態。

In this work, we investigated the polarization properties of stimulated emission (SE) from ten-period ZnO/ZnMgO multiple quantum wells (MQWs) on a c-plane sapphire substrate, which was produced by the pulsed laser deposition technology. Through the excitation of 266 nm Q-switched laser with 10 Hz repletion rate, the SE can be excited owing to the exciton-exciton scattering (ex-ex scattering). The thickness of well and barrier of MQWs were about 2.5 nm and 13.1 nm, respectively. First, the edge emission measurement was carried out using a cylindrical lens to focus the pump beam onto the MQWs with a long line stripe. By rotating a linear polarization, the spectrum component of SE was measured to demonstrate that linear polarized light, with the degree of polarization about 0.95. In addition, the electric field of emission light was perpendicular to the c-axis of MQWs and the photon energy of SE was fixed at around 3.287 eV. At lower excitation energy, the spontaneous emission of MQWs was un-polarization and revealed the shift of photon energy about 35 meV from A-band to C-band. Using a cylindrical lens as a pump lens, a linear polarized emission light, with the degree of polarization about 0.85, was also revealed from normal emission of MQWs. Owing the waveguide effect, the polarization of the SE is perpendicular to the long line stripe of pump beam but independent on the pump polarization. In order to investigate the influence of waveguide effect, a plano-convex lens was used to replace the cylindrical lens and lower the polarization characteristic of SE with the degree of polarization about 0.42. Because of the relatively poor beam quality of the low repletion rate Q-switched laser, the waveguide effect can still exist to produce the polarized SE from MQWs through a plano-convex lens.

摘要 i
ABSTRACT iii
Acknowledgment v
Contents vi
List of Figures viii
List of Tables xii
Chapter 1 Introduction and movtivation 1
1.1 Properties and applications of ZnO 1
1.2 Stimulated emission in semiconductor materials 2
1.3 Advantage of ZnO/ZnMgO multiple quantum wells 5
1.4 Polarization of stimulated emission from semiconductor materials 8
1.5 Motivation 10
Chapter 2 Theoretical background 11
2.1 Quantum confinement effect 11
2.2 Mechanism of exciton-exciton scattering 14
Chapter 3 Experimental setup 17
3.1 Sample preparation 17
3.2 Transmittance and reflectance experiment framework 18
3.3 Photoluminescence experiment framework 19
3.4 Stimulated emission experiment framework 20
3.4.1 Edge emission measurement 20
3.4.2 Normal emission measurement 21
Chapter 4 Results and discussion 22
4.1 Fundamental property of c-plane ZnO/ZnMgO MQWs 22
4.1.1 Transmission electron microscope and X-ray diffraction 22
4.1.2 Photoluminescence and absorbance spectrum 23
4.2 SE from edge emission of c-plane ZnO/ZnMgO MQWs 25
4.2.1 Exciton-exciton scattering from MQWs 25
4.2.2 Polarization characteristic of SE from edge emission of MQWs 26
4.3 SE from normal emission of c-plane ZnO/ZnMgO MQWs 33
4.3.1 Polarization characteristic of SE from normal emission of MQWs using cylindrical lens 33
4.3.2 Polarization characteristic of SE from normal emission of MQWs using plano-convex lens 40
Chapter 5 Conclusion 44
Reference 45

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