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S. Venugopal Rao, T. Shuvan Prashant, T. Sarma, P. K. Panda, D. Swain and S. P. Tewari, “Two-Photon and ThreePhoton Absorption in Dinapthoporphycenes,” Chemical Physics Letters, Vol. 514, No. 1-3, 2011, pp. 98-103. doi:10.1016/j.cplett.2011.08.021

has been cited by the following article:

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

  AUTHORS: Sasidharan Sreeja, Balan Nityaja, Debasis Swain, Vadakkedathu Parameswaran Narayana Nampoori, Padmanabhan Radhakrishnan, Soma Venugopal Rao

  KEYWORDS: DNA; Thin Films; Z-Scan; Picosecond; Two-Photon Absorption

  JOURNAL NAME: Optics and Photonics Journal, Vol.2 No.3, September 20, 2012

  ABSTRACT: 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