Electro-optical properties of excitons in polydiacetylene chains |
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| Authors: | M. Dressler F. Bassani G. Czajkowski |
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| Affiliation: | (1) ETH Zürich, Department of Materials, and Institute of Polymers, 8092 Zürich, Switzerland, CH;(2) Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126 Pisa, and Istituto Nazionale di Fisica della Materia, Italy, IT;(3) University of Technology and Agriculture, S. Kaliskiego 7, 85796 Bydgoszcz, Poland, PL |
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| Abstract: | We show how to compute the optical functions (reflectivity, transmission, and absorption) of polydiacetylene chains diluted in their monomer matrix exposed to a uniform electric field in the chain direction, in the excitonic energy region. Adopting a model electron-hole potential, we derived an analytical expression for the effective chain susceptibility, which gives the optical functions. The resulting absorption shows excitonic peaks below the gap and Franz-Keldysh oscillations above the gap. The method has been applied for a 3BCMU polydiacetylene chain, showing a good agreement with experimental spectra. Received 5 November 1998 and Received in final form 23 February 1999 |
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| Keywords: | PACS. 78.66.-w Optical properties of specific thin films surfaces and low-dimensional structures - 71.35.-y Excitons and related phenomena - 71.36.+c Polaritons (including photon-phonon and photon-magnon interactions) |
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