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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Two 1-Substituted 4-Nitroimidazoles, Maciej Kubicki, Teresa Borowiak, Jerzy Suwinski, Pawel Wagner
Two 1-Substituted 4-Nitroimidazoles, Maciej Kubicki, Teresa Borowiak, Jerzy Suwinski, Pawel Wagner
Australian Institute for Innovative Materials - Papers
Crystalline 4-nitro-1-phenylimidazole, C9H7N3O2, (I), and 4′-nitro-1-phenyl-4,1′-biiimidazole, C12H9N5O2, (II), contain C—H⃛O and C—H⃛N hydrogen bonds, connecting the molecules into infinite chains. The aromatic fragments in both compounds are nearly planar. The dihedral angles between the benzene and imidazole rings are 26.78 (5)° in (I) and 29.36 (8)° in (II).
Population Inversion In An Optically Pumped Single Quantum Well, Timoghy J. Green, Wen Xu
Population Inversion In An Optically Pumped Single Quantum Well, Timoghy J. Green, Wen Xu
Australian Institute for Innovative Materials - Papers
An optically pumped intersubband laser generator is proposed in which the continuum states above an Al0.2Ga0.8As–GaAs–Al0.2Ga0.8As single quantum well with a width of L=17 nm serve as the highest level in a four-level laser system. The design allows much greater flexibility in the choice of pumping source and simplifies considerably the device fabrication. We have obtained the electronic subband structure of the proposed device and utilized a simple rate equation approach to examine the electron density in different states under optical pumping.
Microscopic Treatment Of Substrate Effects On Linear And Quadratic Optical Response Of Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Microscopic Treatment Of Substrate Effects On Linear And Quadratic Optical Response Of Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Australian Institute for Innovative Materials - Papers
Microscopic calculations are reported of linear and quadratic nonlinear optical response in model Langmuir-Blodgett films on a substrate, which is treated by the method of images. The effect of the substrate is significant in the first two layers, and is greatest for tilted molecules with their head groups adjacent to the substrate. The main qualitative effect is to lower the symmetry relative to a free-standing film. Calculations for stearic acidfilms show that the substrate effect is most important for molecules with nonuniform response on a metallic substrate.
Microscopic Calculations Of Linear And Quadratic Optical Response In Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Microscopic Calculations Of Linear And Quadratic Optical Response In Model Langmuir-Blodgett Multilayers, Marc In Het Panhuis, R W. Munn
Australian Institute for Innovative Materials - Papers
Microscopic calculations are reported of linear and quadratic nonlinear optical response in Langmuir–Blodgett films. The films are modeled as ordered layers of molecules that can tilt from the vertical and have a higher polarizability and first hyperpolarizability in the head than in the tail. The local electric field varies little after the first layer and negligibly after the second, which simplifies the analysis. Tilted two-layer Y-type films can have quadratic susceptibility components as large as X- or Z-type ones. Overall the results provide a systematic account of the linear and nonlinear optical properties as a function of …
Asymmetry And Rectification In The Tunnel Current Of A Nanometer-Sized Metal-Conjugated Polymer-Metal Junction, S T. Yau, C Zhang, Peter Innis
Asymmetry And Rectification In The Tunnel Current Of A Nanometer-Sized Metal-Conjugated Polymer-Metal Junction, S T. Yau, C Zhang, Peter Innis
Australian Institute for Innovative Materials - Papers
Electron transport processes of a nanometer metal-conjugated polymer–metal tunnel junction have been probed using a scanning tunneling microscope. The tunnel current of the junction shows two effects. The appearance of an asymmetry in the tunnel current indicates that the junction transport mechanism is different from that for which tunneling occurs directly between two metallic electrodes. Thus, understanding of the asymmetry and hence the transport mechanism demands a detailed description of the metal–polymer interface. By applying the theories of the metal–semiconductor interface to the tunnel junction, we show the presence of an asymmetric electrostatic potential-energy profile, which, together with the metal-induced …
Analysis Of Linear And Quadratic Optical Response Of Mixed Langmuir-Blodgett Films Of Stearic Acid And 5-Ct, Marc In Het Panhuis, R W. Munn
Analysis Of Linear And Quadratic Optical Response Of Mixed Langmuir-Blodgett Films Of Stearic Acid And 5-Ct, Marc In Het Panhuis, R W. Munn
Australian Institute for Innovative Materials - Papers
Published experimental optical second-harmonic generation (SHG) results for mixed films formed between stearic acid and the mesogen 5-CT (4″-n-pentyl-4-cyano-p-terphenyl) are reanalyzed. Experimental refractive index results for the pure films are used to deduce molecular polarizabilities in order to calculate local fields. At low and high fractions of 5-CT, a consistent interpretation of the SHG is obtained using a mean molecular response based on a fixed axial hyperpolarizabilityβLLL for the mesogen, but at high mesogen fractions molecular tilt makes small off-diagonal componentsβLLM≈−βLLL/40 essential. At intermediate fractions the treatment can interpret …