不同偏振和頻寬之光子晶體模擬與增強螢光激發之研究

Abstract

本論文為發展光子晶體(photonic crystal, PC)並探討在不同偏振與頻寬下增強螢光的效果，在某一特定組合的入射波長以及入射角度的光耦合到光子晶體基板，光子晶體可以形成導模態共振，藉此增強近場電場強度，可使螢光檢測具備更佳的靈敏度。 本研究製作的光子晶體結構為一高折射率介電質覆蓋在低折射率介電質上之光柵結構，我們可藉由改變低折射率介電層二氧化矽厚度來調整共振頻寬。本論文完成項目包含：1.利用嚴格耦合波分析法(Rigorous couple wave analysis, RCWA)來設計光子晶體結構，觀察此結構的共振波長及電場的振幅分佈。2.使用紫外光固化壓印之翻模技術以及真空濺鍍(sputter)沉積製作大面積的光子晶體。3.利用市售雷射螢光掃描機比較光子晶體增強螢光效益。4.利用角度解析螢光系統量測在不同偏振下光子晶體增強螢光的效益。5.不同偏振和頻寬之光子晶體結構的模擬與實驗結果做比較。

This thesis is attempted to study photonic crystal enhanced fluorescence (PCEF) with different polarizations and bandwidths. The PCs can form guided mode resonance for near field enhancement at a specific combination of wavelength and angle of incidence; hence, to achieve better sensitivity for fluorescence-based detection. The PCs fabricated in this work are nanostructures composed of a low refractive index dielectric coated with a high refractive index dielectric. Through controlling the thickness of the deposited low refractive index dielectric, SiO2, the resonance bandwidth can be controlled. The works achieved in this thesis includes: 1.Design and study the PCs’ geometries based on rigorous couple wave analysis (RCWA), 2.Fabrication of a large area PC by using replica molding and sputtering technique, 3.Evaluation of PCEF using commercial laser fluorescence scanner, 4.Testing the PCEF with various polarizations using angle resolved fluorescence set up, 5.Comparison the simulation with the experimental results from PC with various polarizations and bandwidths.