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研究生:廖偉程
研究生(外文):Wei-Cheng Liao
論文名稱:利用碳奈米點表面電漿控制隨機雷射
論文名稱(外文):Manipulation of Random Lasers Assisted by Plasmonic Carbon Nanodots
指導教授:陳永芳陳永芳引用關係
指導教授(外文):Yang-Fang Chen
口試日期:2017-07-17
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:物理學研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:英文
論文頁數:55
中文關鍵詞:隨機雷射碳量子點氮化鎵表面電漿共振
外文關鍵詞:random laserscarbon nanodotsgallium nitride nanorodssurface plasmon resonance
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碳奈米點(或是碳量子點)在近幾年成為熱門的研究材料,並且在生物以及光伏領域等取得廣泛的應用。雷射是生活中隨處可見的重要光電元件,然而迄今仍然缺乏碳量子點在雷射方面重要的應用。因此,在這篇論文中,我們藉由碳奈米點在2015年被發現的表面電漿性質的輔助,產生可以控制的隨機雷射訊號。蒐集燃燒蠟燭灰並分離產生的碳奈米點具有類似石墨烯的sp2鍵結結構,將少量的碳奈米點隨機裝飾在氮化鎵奈米柱的表面,藉此增強了氮化鎵的紫外輻射並產生了具有同調性的隨機雷射的訊號。除此之外,我們藉由改變碳奈米點的數量實現了雷射光學回饋以及雷射閾值的可調控性。這些可調控性對於光電元件的應用上非常重要。這個研究成果,不僅提供了利用表面電漿快速且簡單的控制隨機雷射的方法,也讓碳奈米點找到了在光電領域當中更廣泛的應用方法。
Carbon nanodots emerge as popular materials in various research fields, including biological and photovoltaic areas, while there lacks significant reports related to their applications in laser devices, which play a significant role in our daily life. In this work, we demonstrate the first controllable random laser assisted by the surface plasmon effect of carbon nanodots. Briefly, carbon nanodots derived from candle soot are randomly deposited on the surface of gallium nitride (GaN) nanorods to enhance the ultraviolet fluorescence of GaN and generate plasmonically enhanced random laser action with coherent feedback. Furthermore, potentially useful functionalities of tunable lasing threshold and controllable optical modes are achieved by adjusting the numbers of carbon nanodots, enabling for optical communication and identification technologies. In addition to providing an efficient alternative for plasmonically enahnced random laser devices with simple fabrication and low cost, our work also paves a useful route for the application of environmentally friendly carbon nanodots in optoelectronic devices.
口試委員會審定書 I

誌謝 II

中文摘要 III

Abstract IV

List of Publication V

Contents VIII

List of Figures IX

Figure of chapter 1 IX

Figure of chapter 2 IX

Figure of chapter 3 X

Figure of chapter 4 X

Chapter1 Introduction 1

Reference 5

Chapter 2 Theoretical Background 8

2.1 Semiconductors 8

2.2 Radiative Recombination 11

2.3 Surface Plasmon Resonance (SPR) 14

2.4 Dispersion Relation of SPPs 16

2.5 Random Laser (RL) 20

2.6 Plasmonically Enhanced Random Lasers 23

2.7 Random laser threshold 24

Reference 25

Chapter 3 Experimental Details 27

3.1 Material Preparation and Device Fabrication 27

3.2 Measurement of Optical Characteristics 28

3.3 Scanning Electron Microscopy (SEM) 30

Reference 32

Chapter 4 Results and Dicussions 33

4.1 Material Characteristics 33

4.2 Manipulation of Random Lasing Spectral Coherence and Threshold 36

4.3 Investigation of C-dots Surface Plasmons 44

Reference 52


Chapter 5 Conclusion 54
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