Abstract
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.