Browsing by Author "BLAU, WERNER"
Now showing items 56-75 of 80
- Sort by:
- title
- issue date
- submit date
- Order:
- ascending
- descending
- Results:
- 5
- 10
- 20
- 40
- 60
- 80
- 100
-
Phase-matched gratings for enhanced forward degenerate four-wave mixing
BLAU, WERNER (1995)A phase-matched grating to enhance the second-order diffracted signals generated by forward degenerate four-wave mixing has been proposed and demonstrated for the first time to the authors' knowledge. Experiments have been ... -
Photodarkening effect and the optical nonlinearity in a quantum-confined, semiconductor-doped glass
BLAU, WERNER (1990)The room-temperature optical nonlinear behavior of a quantum-confined CdSe-doped glass with ?25-?-size particles is examined. The photodarkening effect is found to be important in this glass. The effect and its influence ... -
Photophysics of a poly(phenylenevinylene) with alternating meta-phenylene and para-phenylene rings
BLAU, WERNER (2000)We have investigated the photophysics of the luminescent polymer poly ~ 1,3-phenylenevinylene- alt -2,5- dioctyloxy-1,4-phenylenevinylene ! by a variety of optical spectroscopies. The incorporation of alternating ... -
Polarised photoluminescence from oriented polymer liquid crystal films
BLAU, WERNER (1997)Optical anisotropy in a new form of crosslinked liquid crystal network incorporating a fluorescent chromophore has been demonstrated. Linearly polarised absorption and fluorescence is observed in oriented thin films. From ... -
Poly(5-tert-butyl)benzothiophene: a soluble form of polyisothianaphthene with a large nonlinear optical response
BLAU, WERNER; DRURY, ANNA (1998)A soluble form of polybenzothiophene has been produced and chemically characterised. NMR spectroscopy indicates that there is a large quinoidal character contribution to the ground state of the polymer. The third ... -
Preparation and Optical Limiting Properties of Multiwalled Carbon Nanotubes with ð-Conjugated Metal-Free Phthalocyanine Moieties
BLAU, WERNER (2009)Phthalocyanines (Pcs) usually exhibit stronger optical limiting response that can be used to protect human eyes, optical elements, and sensors from intense laser pulses. New unsymmetrically substituted metal-free ... -
Production of highly monolayer enriched dispersions of liquid-exfoliated nanosheets by liquid cascade centrifugation
BLAU, WERNER; COLEMAN, JONATHAN (2016) -
Raman spectroscopy and conductivity measurements on polymer-multiwalled carbon nanotubes composites
BLAU, WERNER (2002)Thin films of poly(methyl methacrylate)?multiwalled nanotubes composites were produced by spin coating using different nanotube concentrations. The materials were characterized by scanning electron microscopy, energy-dispersive ... -
Reinforcement of macroscopic carbon nanotube structures by polymer intercalation: The role of polymer molecular weight and chain conformation
BLAU, WERNER; COLEMAN, JONATHAN NESBIT (American Physical Society, 2005)Novel polymer nanotube composites were fabricated by intercalating poly(vinylpyrrolidone) into Buckypaper from solution. This was carried out for both low (10k g?mol) and very high (1.3M g?mol) molecular weight polymers. ... -
Reinforcement of macroscopic carbon nanotube structures by polymer intercalation: The role of polymer molecular weight and chain conformation
COLEMAN, JONATHAN; BLAU, WERNER (2005)Novel polymer nanotube composites were fabricated by intercalating poly vinylpyrrolidone into Buckypaper from solution. This was carried out for both low 10k g/mol and very high 1.3M g/mol molecular weight polymers. ... -
Resonant third-order hyperpolarizabilities of large organic molecules
BLAU, WERNER (1987)Resonant degenerate four-wave mixing in a number of infrared-absorbing dyeswas studied with 160-psec pulses at 1.064 ?m. Hyperpolarizabilities in the range of 10-44 to 10-42 V-2 m5 were observed. A theoretical model based ... -
Silver Nanowire Networks as Flexible, Transparent, Conducting Films: Extremely High DC to Optical Conductivity Ratios
COLEMAN, JONATHAN; BOLAND, JOHN; BLAU, WERNER (2009)We have used aqueous dispersions of silver nanowires to prepare thin, flexible, transparent, conducting films. The nanowires are of length and diameter close to 6.5 ?m and 85 nm respectively. At low thickness, the films ... -
Simple setup for rapid testing of third-order nonlinear optical materials
BLAU, WERNER (1990)A relatively inexpensive and versatile degenerate four-wave mixing setup is described utilizing a nitrogen laser pumped dye laser. Samples can be screened rapidly, which is demonstrated with the example of a semiconductor ... -
Solvent effect on the nonlinear absorption of 5,10-A2B2 meso substituted porphyrins
SENGE, MATHIAS; BLAU, WERNER; WANG, JING (2013)The effect of the solvent on the nonlinear absorptive properties of two series of 5,10-A 2 B 2 porphyrins was investigated with an open Z-scan technique in the ns time regime. The recorded responses, which varied between ... -
Sonication of porphyrin-nanotube composites: a cautionary tale
GIORDANI, SILVIA; BLAU, WERNER (2007)We report the spectroscopic changes of tetraphenylporphyrin carbon nanotube composites in a variety of chlorinated solvents such as chloroform, dichloroethane and dichlorobenzene as a result of sonication. Detailed data ... -
The spatial uniformity and electromechanical stability of transparent, conductive films of single walled nanotubes
COLEMAN, JONATHAN; BLAU, WERNER; BOLAND, JOHN (2009)We have prepared thin films of arc discharge single walled nanotubes by vacuum filtration. For film thicknesses greater than 40 nm, the films are of high optical quality; the optical transmission varies by <2% over the ... -
Spectroscopic changes induced by sonication of porphyrin-carbon nanotube composites in chlorinated solvents
GIORDANI, SILVIA; BLAU, WERNER (2007)We report the spectroscopic changes of tetraphenylporphyrin carbon nanotube composites in a variety of chlorinated solvents such as chloroform, dichloroethane and dichlorobenzene as a result of sonication. Detailed data ... -
Spectroscopical analyis of strained silicon quantum wells
PEROVA, TANIA; MOORE, ROBERT; BLAU, WERNER (SPIE, 2005)In this study, Strained silicon Quantum Wells (QW) were characterised using a variety of micro-scopical techniques. Among the techniques used were Transmission Electron Microscopy (TEM), Elemental Electron Loss ... -
Synthesis and Analysis of Thin Conducting Pyrolytic Carbon Films
DUESBERG, GEORG; KUMAR, SHISHIR; REZVANI, EHSAN; NOLAN, HUGO; KEELEY, GARETH; BLAU, WERNER; MCEVOY, NIALL (2012)We report on an adjustable process for chemical vapour deposition of thin films of pyrolytic carbon on inert substrates using an acetylene feedstock. Through modification of the reaction parameters control over film thickness ... -
Synthesis and strong optical limiting response of graphite oxide covalently functionalized with gallium phthalocyanine
BLAU, WERNER (Institute of Physics, 2011)A soluble graphite oxide (GO) axially substituted gallium phthalocyanine (PcGa) hybrid material (GO?PcGa) was for the first time synthesized by the reaction of tBu4PcGaCl with GO in anhydrous DMSO at 110 ?C in the presence ...