漸進式週期光子晶體共振腔之研究

Study of Graded Photonic Crystal Cavities

鄭鈺潔(Yu-Chieh Cheng)

指導教授 ： 陳啟昌

國立中央大學/理學院/光電科學研究所/碩士(2011年)

摘要

本論文選擇在氮化鎵材料製作二維漸進式週期光子晶體共振腔，使光有效侷限於其中。以平面波展開法(Plane Wave Expansion, PWE) 與有限時域差分法(Finite-Difference-Time-Domain, FDTD)來分析漸進式週期光子晶體共振腔之特性，計算出結構參數，也以光侷限之方法來分析共振腔在垂直方向上的損耗，以及解釋為何高階模態會有較高的Q值。在室溫下架設微光激發光系統(Micro-Photoluminescence,???PL)，量測結果發現，當激發光源功率大於0.9 mW時，成功量得於波長於?=362 nm 之雷射訊號，以高斯擬合得到半高寬為0.04 nm，換算 Q值為1×104。

關鍵字

共振腔 ； 光子晶體

並列摘要

In this study, the photonic crystals nanocavity has been designed, fabricated, and characterized in GaN bulk materials with the heterostructure which could achieve extremely high-Q factors. The device characterization was performed at room temperature using a micro-photoluminescence system. We obtain a lasing signal whose full width at half maximum (FWHM) obtained by Gaussian curve fitting is ??=0.04 nm for ?=362 nm and the threshold of excitation power is found to be 0.9 mW, corresponding to the power density of 17 kmW/cm2. The Q-factor of the cavity is as high as 104.

並列關鍵字

cavities ； Photonic crystals

參考文獻

[1]S. John, “Strong localization of photons in certain disordered dielectric superlattices,” Phys. Rev. Lett. 58, 2486 (1987).

[2]E. Yablonovitch, “Inhibited Spontaneous Emission in Solid-State Physics and Electronics,” Phys. Rev. Lett. 58, 2059 (1987).

[4]J. D. Joannopoulos, S. G. Johnson, J. N. Winn et al., “Photonic Crystals - Molding the Flow of Light,” Second Edition, Princeton University Press, 41 William Street, Princeton, New Jersey 08540 (2008).

[6]A. R. Parker, V. L. Welch, D. Driver et al., “Structural colour - Opal analogue discovered in a weevil,” Nature 426, 786 (2003).

[7]E. Pennisi, “Naturalist''s Surveys Show That British Butterflies Are Going, Going...,” Science 303, 1747 (2004).