光子晶體雙耦合共振腔支柱水模態調變

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题名:	光子晶體雙耦合共振腔支柱水模態調變
作者:	蔡欣翰;Tsai,Hsin-han
贡献者:	物理學系
关键词:	光子晶體;注水;耦合;調變
日期:	2013-07-25
上传时间:	2013-08-22 11:46:55 (UTC+8)
出版者:	國立中央大學
摘要:	本論文利用注水調變光子晶體雙耦合共振腔的共振模態，透過分析微光激螢光光譜的波長分裂量與半高寬，觀察兩耦合共振腔間耦合強度的改變。注水調變的方式分為兩種，一為空氣間隙注水，一為區域性空氣孔柱注水。空氣間隙注水調變，是對兩共振腔造成相同的影響。在此部分的實驗，我們看到兩共振模態在介面方向的消散波分布範圍在0.20μm內；在空氣間隙注滿水時兩共振腔有較大的耦合強度以及較小的品質因子。隨著水量減少耦合強度的變化不大約在0.20meV內，品質因子則上升至1.4 – 2倍。區域性空氣孔柱注水調變，是對兩共振腔造成差別性的影響，其目的在使兩共振腔達到相同狀態。在此部分的實驗，可以透過兩模態波長分裂量的最低點與兩模態半高寬交叉，確認兩共振腔達到相同。在實驗中，我們觀察到以上現象，並經過換算得到光子晶體雙耦合共振腔的耦合強度為9.19meV。 In this thesis, the photonic crystal double coupled cavities’ modes are tuned by water infiltrated. The coupling strength between two cavities can be obtained by analyzing the splitting between MS and MA modes, and the FWHM of these two modes from micro-PL spectrum. There are two water infiltrated ways, one is airgap infiltration (water infiltrated below the slab), and another one is airhole infiltration (water infiltrated into local airholes). Airgap infiltration will induce the same influence to both cavities. In this experiment, we can find the evanescent wave can extend over 0.20μm. As the water in airgap decreasing, the variation of coupling strength is 0.20meV, and the quality factor upraise to 1.4 – 2 times. Airhole infiltration will induce the different influence to each cavity. The purpose of airhole infiltration is trying to tune one cavity to be identical with the other one. When these two cavities are identical, the minimum of two modes splitting and the crossing of two modes FWHM should be observed. Finally, we observe those phenomena, and we can compute the coupling strength of double coupled cavities is 9.19meV.
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