光激發有機極化子元件之模擬與分析;Simulation and analysis of the optically pumped organic polariton device

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题名:	光激發有機極化子元件之模擬與分析;Simulation and analysis of the optically pumped organic polariton device
作者:	高維笛;Kao, Wei-Di
贡献者:	光電科學與工程學系
关键词:	極化子;微共振腔;強耦合;polariton;mirocavity;strong coupling
日期:	2017-01-12
上传时间:	2017-05-05 17:15:57 (UTC+8)
出版者:	國立中央大學
摘要:	本論文研究由金屬-介電質反射鏡組成的有機微共振腔內激子與光子強耦合的現象，建立理論模型分析光激發極化子能態的能量色散與光強分布。此理論模型之建立乃根據Lidzey團隊的研究基礎，其中極化子分布主要由下列幾項因素決定，包括(1)有機分子的光吸收或者分子振動，(2)玻色-愛因斯坦分布機率(Bose-Einstein distribution)，(3)激子庫(exciton reservoir)的激發，和(4)極化子往下支最低能態散射的散射效率。首先本論文藉由模擬Lidzey團隊的極化子元件下支能態之螢光強度分布，得到與Lidzey團隊文獻[1]一致結果，成功驗證所使用的極化子模型的正確性。接著將此模型應用於本實驗室實際製作之不同腔長的DEDOC強耦合共振腔元件，模擬極化子光強分布，發現與量測結果有相似的趨勢，其結果顯示極化子往下支最低能態散射的瓶頸效應(bottleneck effect)為極化子發光之主要損耗機制，而在實作上可透過製作detuning 為正值的極化子元件來降低瓶頸效應，提高散射至最低能態的效率進而增加最低能態極化子的數量與發光強度。;In this study, we investigated the photon and exciton strong coupling phenomenon in the metal-dielectric mirror organic microcavity, and established the model to analyze the dispersion relation and PL intensity distribution of polariton states. This model based on Lidzey’s research, the polariton population is determined by following some factors: the absorption or emission of a molecular vibration, Bose-Einstein distribution, radiative pumping of polariton states, and the polariton scattering efﬁciency into the bottom of lower polariton branch(LPB). We proved the model correctness by simulating the intensity distribution from the Lidzey’s group. Next, polariton devices which the material of exciton is DEDOC cyanine dye was analyzed by the model. The LPB PL intensity distribution of simulation approximate experiment results. From the simulation results, the bottleneck effect is majority mechanism decreasing the PL intensity. In experiment, we can manufacture the positive detuning polariton device to decrease the bottleneck effect and raise the polariton scattering efficiency into lowest LPB state to enhance polariton population and the PL intensity.
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