光子晶體共振腔性質之研究

A study on properties of photonic resonant cavity

徐震瀛(Chen-Ying Hsu)

指導教授 ： 劉宗平

元智大學/電機通訊學院/光電工程學系/碩士(2011年)

摘要

利用折射率在空間上具有週期變化的微結構，並在此結構中引入適當的缺陷層，來製作一維光子晶體共振腔。利用光學矩陣傳輸法模擬計算可求得共振腔的共振波長之品質因子和缺陷層厚度之間的變化關係
，並探討斜向入射之品質因子與正向入射的結果比較。從模擬結果發現，斜向入射可使超窄帶透射峰向低頻方向移動，入射角度愈大品質因子可顯著提高。最後，藉由相同性質的兩個缺陷層結構，可達到相同波長範圍內共振峰個數增加，藉以提升品質因子的目的；此時，若調整其中一個缺陷層的折射率，可大幅降低共振波透射率，形成一種光開關元件。

關鍵字

光子晶體 ； 矩陣傳輸法

並列摘要

This study utilizes the micro-structure with periodic varying refractive index to introduce the specific defect layer to form a one-dimensional photonic crystal resonant cavity. The influences of the thickness of defect layer on the resonant wavelength and its quality factor were studied with optical transmission matrix method. At the same time, we compare forward incidence with diagonal incidence and discuss the difference between their quality factors. Through numerical simulating, we can obtain the extra-narrow transmission peak will shift toward low frequency and the quality factor increases observably with the gradual incremental incident angel. To promote quality factor by increasing the resonant peaks within the same range of wavelength, we utilize the symmetrical structure with two same characteristic defect layers to achieve. As we vary the refractive index of either defect layer, the obvious slash of transmissivity will form a optical switching device.

並列關鍵字

photonic crystal ； transfer-matrix method

參考文獻

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