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Title: 石墨烯量子點於垂直共振腔面射型雷射之光學特性研究
graphene quantum dots vertical cavity surface emitting lasers
Authors: 李亞儒
Lee, Ya-Ju
Chen, Jia-Wen
Keywords: 石墨烯量子點
Graphene Quantum Dots
Vertical Cavity Surface Emitting Laser
Microwave-Assisted Hydrothermal Method
Issue Date: 2019
Abstract: 石墨烯量子點 (GQDs) 是一種新型光學增益材料,目前可用於具有高性價比和高效率元件的特性來作為光源。但截至目前為止,在學術期刊文獻當中,只有極少數關於GQDs產生誘發輻射,並應用於雷射輸出的研究與探討。在本碩士論文中,我們成功地製作出第一顆室溫光激發石墨烯量子點綠光面射型雷射( = 550 nm)。首先,藉由週期性成長堆疊Ta2O5 / SiO2兩種高折射係係數差異介電質材料,來設計並製作高光學品質的布拉格反射鏡 (Distributed Bragg Reflector, DBR),其不僅提供與GQDs在輻射光譜上具有高重疊性,並同時在紫外光區域具有高光學穿透率。我們自行設計的DBR,將可見光波段 400 – 700 nm的光反射率高達95% 以上,並且在激發雷射光 ( = 355 nm) 有高達30% 的穿透率。我們再將兩片Ta2O5 / SiO2 DBR夾擠GQDs 作為光學增益介質,形成垂直型光學共振腔面射型雷射結構(Vertical-Cavity Surface-Emitting Laser, VCSEL),透過脈衝雷射激發後 (5 ns pulse width , 10 Hz repetition rate,  = 355 nm),最終在室溫下產生穩定的綠光雷射輸出。而我們的雷射是種無極化現象的多模態 (multi-mode) 雷射,較容易地去調控我們所需要的波長,也可以從 CIE1931 座標當中確認到我們的雷射波長是很穩定的,是可以藉由調控 GQDs 的直徑大小來控制我們雷射的發光波長。 藉由本實驗清楚地證明了GQDs能作為一種實用、成本低廉且高量子轉換效率的光學增益材料,展現GQD-VCSEL在寬色域雷射顯示器和投影式影像的高潛力應用。
Nonzero-bandgap graphene quantum dots (GQDs) are novel optical gain materials promising for solution-processed light sources with high cost efficiency and device performance. To date, there have only been a few reports on the realization of GQDs-based lasers. Herein, we demonstrate for the first time room-temperature lasing emission with green gamut from GQDs in a vertical optical cavity composed of Ta2O5/SiO2 dielectric distributed Bragg reflectors (DBRs). The lasing is enabled by the unique design of the DBR which not only provides a wide stopband spectrally overlapping with the emission of the GQDs but also allows high transmittance of optical excitation in the UV-light region. This demonstration is a clear evidence of the use of GQDs as optical gain materials and represents an important step forward towards their potential applications in wide-gamut laser displays and projectors.
Other Identifiers: G060548032S
Appears in Collections:學位論文

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