生物高分子材料之放大自發輻射性質研究

Study of Amplified Spontaneous Emission from DNA Biopolymers

蘇哲玄(Che-Hsuan Su)

指導教授 ： 洪毓玨

國立清華大學/電機資訊學院/光電工程研究所/碩士(2013年)

摘要

去氧核糖核酸（deoxyribonucleic acid，DNA）擁有特殊的結構和性質，已在生化、奈米科技方面有許多的應用。近年來DNA高分子也應用於光電領域，且其在自然界中含量豐富、對環境無害，是非常有潛力的材料。
目前運用DNA高分子於發光應用上大多關注於DNA主體材料的挑選和染料的搭配，但用於改質DNA的界面活性劑其實對系統的效能也扮演著重要的角色。因此本研究嘗試以芳香族界面活性劑vinylbenzyltrimethylammonium chloride和benzyltrimethylammonium chloride改質之DNA作為主體材料，使用Rh6G（rhodamine 6G）作為染料，探討其自發放大輻射特性，並與目前大部分研究以脂肪族界面活性劑（(hexadecyl)trimethylammonium chloride，CTMA）改質之DNA主體材料作比較。研究發現以芳香族界面活性劑改質的DNA材料擁有較極低的閾值（threshold），論文中討論了可能的機制，此特性可應用於有機染料雷射系統。
此外，本論文第二部分也探究有機雷射於紅外光波段的應用，研究以4,8-dibromobenzo-[1,2-c;4,5-c’]bis[1,2,5]thiadiazole為核心，合成出全新的紅外光染料，被805 nm與1210 nm的光激發時，可放出1245 nm的紅外光，未來可運用於光通訊元件的製作。

關鍵字

DNA ； 去氧核糖核酸 ； 放大自發輻射 ； 染料 ； 雷射

並列摘要

Deoxyribonucleic acid (DNA) has a unique helix structure and exhibits interesting material properties, which have found many applications in biochemistry and nanotechnology. Recently, DNA biopolymer has also been implemented in optoelectronics. As DNA is rich in nature and is an environmental-friendly material, research in DNA photonics has drawn much attention.
Most research efforts have emphasized on manipulation of DNA host and dyes. However, the surfactant used to modify DNA also plays in important role in system performance. In this work, we use aromatic surfactants vinylbenzyltrimethylammonium chloride and benzyltrimethylammonium chloride to modify DNA doped withrhodamine 6G dye, and study the amplified spontaneous emission.The experiment results are compared to the commonly used lipid surfactant (hexadecyltrimethylammonium chloride)-based DNA biopolymer. It is found that the DNA biopolymer modified by aromatic surfactants exhibitslower threshold. The possiblemechanism is discussed and this property may be promising for the applications of organic dye laser.
The second part of this thesis present the synthesis of an IR dye. We use 4,8-dibromobenzo-[1,2-c;4,5-c’]bis[1,2,5]thiadiazole as the core structure and synthesize a new organic infrared dye. The synthesized infrared dye emits 1245 nm lightwhen excited at805 nm and 1210 nm. This dye may bepotential to be employed in optical communication.

並列關鍵字

DNA ； ASE ； dye ； laser

參考文獻

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