Effect of deoxyribonucleic acid on nonlinear optical properties of Rhodamine 6G-polyvinyl alcohol solution

Abstract

We have investigated the effect of DNA on nonlinear optical properties of Rhodmine6G-PVA solution through open aperture Z-scan. We observed saturable absorption (SA) at 532 nm for dye solution without DNA. A strong influence on SA behavior of dye solution was observed by adding DNA. As the concentration of DNA (2 wt %) increased, we observed RSA within SA. The sample shows SA behavior away from focus and RSA behavior near the focus. Theoretical analysis has been performed using a model based on nonlinear absorption coefficient and saturation intensity. The result of present study gives an additional mechanism for the gain enhancement in dye doped DNA matrix.