在此研究中，我們製作出了電控波長可調的共振腔發光二極體(Resonant-Cavity Light Emitting Diode，RCLED)元件。它是由主動層材料為AlGaInAs的量子井結構和被填入液晶的Fabry-Pérot共振腔所結合而成。而本實驗分別填入向列型液晶以及膽固醇液晶，比較兩者在光致螢光光譜上的差異。當使用向列型液晶時，液晶的光學異向性使沿著非尋常光方向的模態能藉由電壓來調變且調變範圍可到58奈米，得到的光譜與偏振有關。反之，若填入膽固醇液晶則每個方向的偏振光皆感受到相同折射率的變化，因此共振模態與偏振無關；但其折射率的變化較小，所以調變範圍只有41奈米。此外，我們也模擬了向列型液晶樣品，並將理論值與實驗值作比對。本實驗是由波長為1064奈米的雷射光激發半導體元件並在室溫下觀測到的結果。

In this study, we fabricated an electrically wavelength-tunable resonant-cavity light emitting diode (RCLED). It was achieved by the combination of an AlGaInAs quantum well structure with an intra-cavity liquid crystal material. In the phase modulator layer, we used nematic liquid crystal (NLC) and cholesteric liquid crystal (CLC), respectively, comparing their difference in the infrared-spectrum. When inserting NLC, the anisotropic properties of liquid crystal enable continuous tuning of mode emission along the extraordinary direction and provide a 58 nm tuning range. The optical characteristics of this device are polarization dependent. On the contrary, the CLC-based device is polarization independent because any polarization of incident light experiences the same averaged refractive index. However, the phase difference of CLC is less than NLC, only a 41 nm tuning range of this sample. We also simulated and discussed experimental results of NLC-based RCLED. The optical pumping of the active region is realized by a CW laser at 1064 nm wavelength and observed at room temperature.

摘要..................................................................................i
Abstract...........................................................................ii
致謝................................................................................iii
目錄................................................................................iv
圖目錄............................................................................vi
表目錄............................................................................ix

第一章 序.........................................................................1
第二章 簡介.....................................................................2
2.1液晶簡介...................................................................2
2.1.1 何謂液晶.............................................................2
2.1.2 液晶的分類.........................................................3
2.2液晶的物理特性.......................................................9
2.2.1液晶的秩序參數..................................................9
2.2.2折射率異向性....................................................10
2.2.3介電係數異向性................................................13
2.2.4液晶的彈性連續體理論.....................................15
2.2.5黏滯係數異向性................................................16
2.3半導體雷射簡介.....................................................17
2.4發光二極體............................................................21
2.5共振腔式發光二極體(RCLED)...............................22
第三章 理論介紹...........................................................24
3.1 Fabry-Pérot共振腔...............................................24
3.2反射鏡...................................................................30
3.2.1布拉格反射鏡...................................................30
3.2.2金屬反射鏡.......................................................32
3.3活性層...................................................................32
3.4注入液晶的共振腔式發光二極體元件(LC-RCLED.33
3.5光致螢光理論........................................................35
3.6 V-T curve理論......................................................35
第四章 實驗方法與過程................................................37
4.1 LC-RCLED樣品製備............................................37
4.1.1材料介紹..........................................................37
4.1.2使用設備..........................................................40
4.1.3元件製作過程...................................................44
4.2實驗量測裝置........................................................48
4.2.1光致螢光光譜量測............................................48
4.2.2光致螢光的偏振態量測.....................................49
4.2.3 V-T curve量測.................................................50
第五章 結果與討論.......................................................51
5.1 向列型液晶注入RCLED.......................................51
5.1.1 NLC-RCLED光致螢光光譜之電控分析...........51
5.1.2 NLC-RCLED之相位分析.................................58
4.1.3 NLC-RCLED光致螢光光譜之模擬分析...........60
5.2膽固醇液晶注入RCLED........................................66
5.2.1 CLC-RCLED光致螢光光譜之電控分析...........66
第六章 總結與未來展望...............................................69
參考文獻.....................................................................71

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