Showing papers by "S. Roth published in 1991"
28 citations
TL;DR: In this article, a spray-deprivation thin CdS film laser induced optical device (LIOD) was studied experimentally and theoretically and it was shown for the first time that the observation of equal contrasted all-OB and hybrid bistable (HB) loops is possible.
Abstract: A spray deposited thin (6 μm) CdS film laser induced optical device (LIOD) was studied experimentally and theoretically. The all optical bistable (all-OB) and the hybrid bistable (HB) features at 210 K were investigated. It is shown for the first time that the observation of equal contrasted all-OB and HB loops is possible in thin CdS films. The slope of the all-OB loops were calculated with a new theoretical model which is established on the thermal enhanced shift of the absorption edge and the transmitted light equilibrium condition. A good agreement with the experiments is found. Furthermore, it is pointed out that the electron life time determines the fashion and the contrast of the HB loops. In this context the proof is furnished that the maximal possible HB loops is observed. Finally, the influence of Joule's heat on OB and HB is demonstrated.
12 citations
TL;DR: Pyrenes with alkylthio substituents represent a new class of relatively cheap donor compounds which can be reacted to very stable radical cation salts with high conductivity.
11 citations
TL;DR: In this paper, photo-induced bleaching was performed on thin donor-acceptor polyenes with various end groups and the experimental results showed a photoinduced Bleaching (PB) of the π - π ∗ transition and, depending on the end groups, one or two photoinduced absorption (PA) bands in the gap.
6 citations
TL;DR: In this article, the excited states of single-crystalline all-trans β-carotene were investigated by electron energy-loss spectroscopy (EELS), and the momentum-dependent dielectric function was derived by a Kramers-Kronig analysis.
5 citations
TL;DR: In this paper, the conductivity and thermopower of highly conductive oriented polyacetylene samples doped with iodine were investigated. And the influence of these defects on the electronic properties was investigated.
5 citations
4 citations
TL;DR: In this paper, donor-acceptor substituted polyenes have been synthesized in order to investigate electronic excitations in possible components of future electronic devices and a synthetic route to polyenes with an interruption of the conjugation has been developed.
2 citations
TL;DR: The thermopower of highly conductive oriented polyacetylene doped with iodine was measured and the maximum conductivity at room temperature of these samples was about 2 × 10 4 S/cm.
2 citations
TL;DR: In this article, the frequency dependence of the conductivity of highly ordered highly conducting polyacetylene (HOMPCN) is reported, and the onset can strongly be influenced by the introduction of sp 3 defects.
1 citations
TL;DR: The LB-films play a major role as model systems in the development of future devices, especially in fields related to nonlinear optics and molecular electronics as discussed by the authors, and the LB-technique provides a powerful method to assemble molecules with specific electronic functions.