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標題: | 利用表面電漿或光子晶體增強或調控螢光強度之研究 Enhancing and Modulating Light Emission by Surface Plasmon or Photonic Crystal |
作者: | Chih-Min Chuang 莊智閔 |
指導教授: | 林唯芳 |
共同指導教授: | 陳永芳 |
關鍵字: | 光子晶體,表面電漿,自組裝,螢光,奈米粒子, photonic crystal,surface plasmon,self-assembly,fluorescence,nanoparticle, |
出版年 : | 2007 |
學位: | 博士 |
摘要: | 在此論文中,我們研究如何利用表面電漿或光子晶體來增強或調控螢光強度。
在表面電漿方面,我們研究兩種二維的金屬週期結構。我們使用電子束曝光顯影聚甲基壓克力(PMMA)和熱蒸鍍銀的方式來製備銀覆蓋的甲基壓克力陣列。氧化銀本身具有光催化的螢光。當我們調整金屬柱的大小和週期,使陣列的吸收符合激發波長時,螢光強度會被增強。 我們使用電子束曝光顯影硒化鎘/聚甲基壓克力(CdSe/PMMA)和熱蒸鍍金的方式來製備金覆蓋的硒化鎘/甲基壓克力陣列。硒化鎘半導體顆粒具有量子侷限效應產生的螢光。表面電漿效應將會隨著金屬柱的大小增大而有紅位移的情形。螢光強度也可以由金屬柱的大小來控制。 我們利用電子束曝光La0.7Sr0.3MnO3(LSMO)光阻製備了二維的光子晶體。LSMO在製程中使用環保無毒性的水當顯影劑。而且,LSMO的高折射率(n=2.38)使其在光子晶體上具有良好的性質。我們可以利用電子束曝光的劑量來調控LSMO光子晶體的吸收位置。而硒化鎘的螢光強度也可以利用LSMO光子晶體來控制。經過電子束曝光的LSMO,可以再經過900oC,4小時的燒結來增強其磁特性。 我們也製備了三維的二氧化矽光子晶體來控制硒化鎘的螢光強度。三維的光子晶體可以利用重力沈澱法或是對流法(convective)來製備。而光子晶體的能隙可以利用二氧化矽顆粒的大小來控制。 Enhancing and modulating light emission by surface plasmon or photonic crystal was studied in this dissertation. For the surface plasmon, two kinds of two dimensional metal periodic arrays are investigated. The silver coated PMMA arrays are fabricated by electron beam patterned PMMA and thermal evaporated silver metal. The silver oxide exhibits photoactived fluorescence. By adjusting column diameters and lattice constants of the array to coincide with the excitation wavelength, the fluorescence was markedly enhanced. The gold coated CdSe/PMMA array are fabricated by electron beam patterned CdSe/PMMA and thermal evaporated gold metal. The semiconductor CdSe nanoparticles exhibit the quantum confined fluorescence. The main surface plasmon resonance was red shifted as we increased the column diameter. The fluorescence also can be enhanced by adjusting column diameters. We have developed a direct writing resist from water based spin-coatable LSMO material by using its precursor sol gel solution and the patterned LSMO film that can be developed using nontoxic and environmental friendly pure water. Additional, the LSMO can be a good photonic crystal material due to its high refractive index. (n=2.38) The absorbance spectra of the La0.7Sr0.3MnO3 resist can be tuned in a fixed design pattern by varying the electron dose. The photoluminescence of CdSe can be manipulated by 2D LSMO photonic crystal. The magnetic properties of the patterned LSMO can be enhanced by post sintering the sample at 900oC for 4 hours after e-beam writing. We have also fabricated 3D silica photonic crystal to modulate the photoluminescence of CdSe nanoparticles. The 3D silica photonic crystals were fabricated either by gravitational sedimentation or convective method. The photonic crystal band gap can be changed by controlling the diameter of the silica spheres. The photoluminescence of CdSe nanopartilces can be either enhanced or decreased. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/28977 |
全文授權: | 有償授權 |
顯示於系所單位: | 材料科學與工程學系 |
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