Nonlinear Optical Studies of DNA Doped Rhodamine 6G-PVA Films Using Picosecond Pulses

• 作者: Balan Nityaja Debasis Swain Padmanabhan Radhakrishnan Sasidharan Sreeja Soma Venugopal Rao Vadakkedathu Parameswaran Narayana Nampoori
• 来源期刊: 光学与光子学期刊(英文)
• 学科: 医学
• 关键词: DNA THIN Films Z-SCAN PICOSECOND TWO-PHOTON ABSORPTION
• 年，卷（期）: 2012,（3）
• 页码范围: 135-139
• 页数: 5页
• 分类号: R73

摘要

We present our results from the measurements of third-order optical nonlinearity in DNA doped Rhodamine 6G/PVA films achieved through Z-scan measurements using ~2 picosecond (ps) pulses at a wavelength of 800 nm. The films demonstrated negative nonlinear refractive index (n2) with magnitudes of (0.065 - 2.89) × 10–14 cm2/W with varying concentration of DNA. Open aperture data demonstrated strong two-photon absorption with a magnitude of ~1.6 cm/GW for films doped with 2 wt% of DNA. The recovery time of excited state population, retrieved from the degenerate pump-probe experimental data, was <4 ps. These data suggests that DNA is promising material for applications such as optical switching.