布拉格反射器之反射光譜研究

The reflectivity spectra studies of Distributed Bragg Reflectors

余秀玲(Hsiu-Ling Yu)

指導教授 ： 沈志霖

中原大學/理學院/應用物理研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400411

摘要

摘要

本論文是對結構為15對和20對週期的ZnTe/ZnSe布拉格反射器的光學特性做研究。我們探討這兩個樣品的正向入射和改變角度、改變偏振的反射光譜。大致上，可分做兩部分來討論：
首先，我們以傳輸矩陣（transfer matrix）的理論模擬並配合—折射率色散函數和厚度變化，成功地解釋了正向的反射光譜。此外，也獲得了樣品成長過程中的厚度分佈。
接著，我們由不同角度入射與不同偏振光來分析布拉格反射器的反射性質，發現隨著入射角越大而反射帶往短波長偏移。但是對於S偏振和P偏振的帶寬變化的趨勢卻不同。這些現象都可用理論模擬來吻合。另一方面，藉由改變角度的實驗,我們得出了ZnTe/ZnSe布拉格反射器的全向反射帶（omnidirectional reflectance band）寬度。
此外，本論文也研究非對稱微腔體的反射光譜。我們討論了共振吸收與偵測角度的關係。

關鍵字

轉角度 ； 布拉格反射器 ； 偏振

並列摘要

Abstract

We study the optical properties of the Bragg reflectors, which consist of 15 pairs and 20 pairs of ZnTe/ZnSe quarter wave stacks. By changing the angle of detection and polarization, the reflectivity spectra of these two samples were investigated. The studies are divided into two subjects：
First, we use the transfer matrix method, along with the dispersion of refractive indices and the distributed random of thickness, explain the reflectivity in normal direction successfully. In addition the thickness distribution in the crystal growth is also obtained.
Second, the reflection band shifts toward short-wavelength side write increasing the detection angle. The angle-dependence of the width of reflection band is different for S and P polarizations. These phenomena can be well simulated with theoretical model. On the other hand, by changing the detection angle, the omnidirectional reflection bands of ZnTe/ZnSe Bragg reflectors are obtained.
In this thesis, we also study the reflectivity of on asymmetric microcavity. The relation between the absorption of cavity mode and the detecting angle is under discussion.

並列關鍵字

angle ； polarizations ； Bragg Reflectors

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