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nonlinear optics Many of the molecules that we make are designed to interact with light and function as nonlinear optical (NLO) materials. Basically, NLO materials allow for the manipulation of light with light, which gives rise to many amazing and futuristic applications.[1]
The DOKE set-up of Hegmann’s group In collaboration with the group of Professor Frank Hegmann at the Department of Physics and Dr. Kenji Kamada at the National Institute of Technology (Osaka), we are exploring the ultrafast third-order nonlinearities of novel organic materials. The Hegmann group has developed a modified detection technique for the optical Kerr effect that allows us to establish both the real and imaginary components of the optical nonlinearities at the same time, substantially simplifying the analyses (called DOKE). This interdisciplinary effort has provided the first studies of the third order nonlinear optical (NLO) characteristics for both hypervalent iodine salts 1-4,[1-2] and monodisperse iso-PDA oligomers.[2-5] More recently, we have worked to establish the NLO characteristics of conjugated polyynes, and this study has shown that polyynes are considerably better NLO materials than would have been predicted theoretically.[5-8] We have also taken an interest in the NLO characteristics of 2-dimensional chromophores, something we are exploring with the group of Prof Mike Haley at Oregon.
iso-PDA pentadecamer Recent papers: [1] “Structure-Property Relationships in Third-Order Nonlinear Optical Chromophores,” R.R. Tykwinski, U. Gubler, R. E. Martin, F. Diederich, Ch. Bosshard, P. Günter, J. Phys. Chem. B 1998, 102, 4451-4465. [2] “Thienyl(phenyl)iodonium Triflates – Structural and Linear and Nonlinear Optical Behavior of Hypervalent Iodine Derivatives,” R.R. Tykwinski, K. Kamada, D. Bykowski, K. Ohta, R. McDonald, Adv. Mater. 2000, 12, 133-137. [3] “Nonlinear Optical Properties of Thienyl and Bithienyl Iodonium Salts as Measured by the Z-scan Technique,” R.R. Tykwinski, K. Kamada, D. Bykowski, F.A. Hegmann, R.J. Hinkle, J. Opt. A, Pure Appl. Op. 2002, 4, S202-S206. [4] “Ultrafast Optical Kerr Effect Measurements of Third-Order Nonlinearities in Cross-Conjugated iso-Polydiacetylene Oligomers,” A.D. Slepkov, F.A. Hegmann, Y. Zhao, R.R. Tykwinski, K. Kamada, J. Chem. Phys. 2002, 116, 3834-3840. [5] "Synthesis, Structure, and Nonlinear Optical Properties of Cross-Conjugated Perphenylated iso-Polydiacetylene," Y. Zhao, A.D. Slepkov, Clement Osei Akoto, R. McDonald, F.A. Hegmann, R.R. Tykwinski, Chem. Eur. J. 2005, 11, 321-329. [6]"The Surprising Nonlinear Optical Properties of Conjugated Polyynes,” A.D. Slepkov, S. Eisler, E. Elliott, F.A. Hegmann, R.R. Tykwinski, J. Chem. Phys. 2004, 120 6807–6810. [7] "Polyynes as a Model for Carbyne: Synthesis, Physical Properties and Nonlinear Optical Response," S. Eisler, A.D. Slepkov, E. Elliott, T. Luu, R. McDonald, F.A. Hegmann, R.R. Tykwinski, J. Am. Chem. Soc. 2005, 127, 2666-2676. [8] "Synthesis, Structure and Nonlinear Optical Properties of Diarylpolyynes," T. Luu, E. Elliott, A.D. Slepkov, S. Eisler, R. McDonald, F.A. Hegmann, R.R. Tykwinski, Org. Lett. 2005, 7, 51-54. [9] "Two-Photon Absorption in 2-D Conjugated Quadrupolar Chromophores," A.D. Slepkov, F.A. Hegmann, R.R. Tykwinski,, K Kamada, Koji Ohta, J.A. Marsden, E.L. Spitler, J.J. Miller, M.M. Haley, Opt. Lett. 2006, 31, 3315-3317.
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