利用金屬微共振腔研究光與有機激發態強耦合現象; Strong photon-exciton coupling in a metal microcavity

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/61463

Title:	利用金屬微共振腔研究光與有機激發態強耦合現象;Strong photon-exciton coupling in a metal microcavity
Authors:	陳衍廷;Chen,Yan-Ting
Contributors:	光電科學與工程學系
Keywords:	光子與激子激發態強耦合;photon-exciton strong coupling
Date:	2013-08-27
Issue Date:	2013-10-08 15:12:54 (UTC+8)
Publisher:	國立中央大學
Abstract:	本篇論文主要探討光與物質耦合的現象，在研究中我們將有機材料排列成J-aggregate 結構，此排列方式會使偶極矩不為0，且由於激子生命週期短，利於激子與光有效的能量轉換。我們也對所使用的 PDAC/DEDOC J-aggregate 薄膜，做了許多光學性質與物理結構的探討，證實它具有高吸收係數，以及奈米等級的厚度，讓我們有機會應用到光與物質耦合的光學元件中。為了預測光子與有機激子耦合作用，我們建立了Hamiltonian的擴增矩陣模型，與多層膜矩陣的模型。利用這些模型，預期並設計出理想的微共振腔。為了有效觀察，我們將J-aggregate薄膜置入λ/2的金屬微共振腔結構中，觀察到的拉比分裂能量都比介電質微共振腔大。並利用多角度反射頻譜，可量測到極化子的色散關係，分別為上分支(UB)與下分支(LB)。而在某一角度下可觀察到兩分支最為靠近，此時光子與激子能量交換會最強烈，其分裂的能量差稱之為拉比分裂能量(Rabi splitting energy)。在比較不同主動層厚度對拉比分裂能量後，證實能量與主動層厚度呈現線性關係，並利用角度解析螢光頻譜，確定在我們的元件中，有半光半物的極化子產生。 In this study, we demonstrate the phenomenon of light and matter coupling with microcavity and organic exciton. The J-aggregate structure is arranged by molecular dipole of organic material, and this arrangement is not zero dipole. The energy transfer between exciton and photon is efficient because the exciton lifetime is short. We have discussed physical structure and optical properties in PDAC/DEDOC J-aggregate films possessed the high absorption coefficient and the nanoscale thickness. Using these phenomena we can manufacture the optical element with light-matter coupling property. We designed the ideal microcavity using Hamiltonian amplification matrix model and multilayer matrix model in order to predict the photon-exciton coupling. To observe Rabi splitting energy we insert the J-aggregate films into λ/2 metal microcavity structure. The energy of microcavity structure is large than the dielectric resonator. The upper branch (UB) and the lower branch (LB) polarton dispersion can be measured by multi-angle reflection spectrum, respectively. The energy transfer between exciton and photon is intense while separated branch close each other at certain angle. We call this energy difference between separated branch as Rabi splitting energy. Finally, we verify the linear relation between thickness of active layer and Rabi splitting energy. The existence of half-light and half-matter polariton in our element can be measured angle resolved fluorescence spectrum.
Appears in Collections:	[Graduate Institute of Optics and Photonics] Electronic Thesis & Dissertation

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