Abstract
Deoxyribonucleic acid (DNA) is an important molecule carrying genetic information in organisms. Due to several features of DNA molecule, such as self-assembly and molecular recognition capabilities, DNA has found broad applications in nanotechnology. Recently, DNA biopolymer has also been reported to exhibit unique optical and electrical properties. Many optoelectronic devices have been implemented using DNA biopolymer with enhanced efficiency. In this study, we used a photochemical method to fabricate DNA-silver nanoparticles nanocomposite and investigated its nonlinear optical properties. A Z scan technique with nanosecond laser pulses at 532 nm was employed to obtain two-photon absorption coefficient. The value of DNA nanocomposite is larger than the value of DNA biomaterials.The results show that the nonlinear properties of DNA nanocomposite can be enhanced due to the surface plasmon resonance effect of silver nanoparticles. And the application in optical limiting was also studied and discussed