Robert Twieg
Liquid Crystal Institute
15 Papers
146 Citations
Robert Twieg is an academic researcher from Liquid Crystal Institute. The author has contributed to research in topics: Hyperpolarizability & Chromophore. The author has an hindex of 7, co-authored 15 publications. Previous affiliations of Robert Twieg include Case Western Reserve University.
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Papers
Synthesis and Characterization of New Truxenones for Nonlinear Optical Applications
Lionel Sanguinet,Jarrod C. Williams,Zhiyong Yang,Robert Twieg,Guilin Mao,Kenneth D. Singer,Greg Wiggers,Rolfe G. Petschek +7 more
TL;DR: In this paper, the synthesis of truxenones and one tris(dicyanomethylene) derivative substituted by different amines at positions 4, 9, and 14 is reported.
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Measurements of the hyperpolarizability tensor by means of hyper-Rayleigh scattering
Victor Petrovich Ostroverkhov,Rolfe G. Petschek,Kenneth D. Singer,L. Sukhomlinova,Robert Twieg,S. X. Wang,Liang-Chy Chien +6 more
TL;DR: In this article, the rotational invariants of the first hyperpolarizability tensor were measured with a series of chiral and non-chiral chromophores.
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Photodegradation of selected π-conjugated electro-optic chromophores
A. Galvan-Gonzalez,Kevin D. Belfield,G. I. Stegeman,Michael Canva,Seth R. Marder,K. Staub,G. Levina,Robert Twieg +7 more
TL;DR: The photodegradation properties of six electro-optic chromophores in guest-host polymer formats were measured as a function of wavelength throughout the visible and up to 1.3 μm in the near infrared as discussed by the authors.
Photoconductivity in organic thin films: From picoseconds to seconds after excitation
TL;DR: In this paper, a detailed study of transient and continuous wave (cw) photoconductivity in solution-grown thin films of functionalized pentacene (Pc), anthradithiophene (ADT), and dicyanomethylenedihydrofuran (DCDHF) is presented.
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Optimization of the molecular hyperpolarizability for second harmonic generation in chiral media
Victor Petrovich Ostroverkhov,Oksana Ostroverkhova,Rolfe G. Petschek,Kenneth D. Singer,L. Sukhomlinova,Robert Twieg,S. X. Wang,Liang-Chy Chien +7 more
TL;DR: In this article, the properties of the hyperpolarizability tensor that transform like a second-rank pseudotensor (La 2) and a third-rank tensor (La 3) contribute to second harmonic generation in chiral media.
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