本篇論文係利用雙光子激發螢光技術，對含噻吩（thiophene）、蒽（anthracene）、吡嗪（pyrazine）、喹喔啉（quinoxaline）、三嗪（triazine）等數種新穎雜環構造單元之染料分子系統進行量測其雙光子吸收性質並探討分子結構與非線性光學性質之關聯性。總體來說，我們發現下列幾種結構要素與分子的雙光子吸收性質有密切關聯： 一、電子提供體之強度的大小 二、π－共軛長度 三、分子結構的共平面性與否 在本論文所研究之染料分子系統中，我們觀察到：比起二萘基氨，二苯基氨是更為優越的電子提供體。而在分子結構中插入碳－碳間參鍵、乙烯基（vinyl）、蒽單元或是苯環單元等以延伸π共軛長度之方式，對於促進分子之雙光子吸收皆為有效的策略。此外，本研究中顯示，分子結構的共平面性在增強雙光子吸收程度上，扮演一個很重要的角色。 ;Several novel chromophore systems with various heterocyclic structural units including thiophene, anthracene, pyrazine, quinoxaline, and triazine were designed and synthesized to investigate the relationship between molecular structure and their linear/non-linear optical properties. The two-photon absorption (2PA) spectra of the studied compounds were measured by two-photon-excited fluorescence (2PEF) technique. Overall, we have found the following molecular parameters that are closely related to the enhancement of molecular 2PA: 1. Electron-donor strength; 2. π-conjugation length; 3. Coplanarity of the structure In our chromophore systems, we have observed that diphenylamine is a superior electron-donor compared to naphthylamine. Moreover, it is noted that extending the π-conjugation length by insertion of carbon-carbon triple bond, or vinyl, or anthracene unit, or phenyl unit are useful strategies to promote the molecular 2PA. In addition, it is revealed that the coplanarity of the structure plays a crucial role for the extent of the 2PA enhancement.
