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(38,317 articles)
Popular News
Ink-Jet Simplifies Organic LED Design
Jun 1, 2002 — Researchers at the University of Arizona in Tucson have developed an ink-jet printing method for constructing organic LEDs that does not require a special mask or prepatterning of a substrate's surface. A user designs a pattern on a computer, which then instructs a specialized ink-jet printer to deposit the organic "ink" directly onto an electrically conductive surface. Ghassan E. Jabbour, designer of the patent-pending process, said it could be used in a variety of applications, such as...
Sensor Could ID Complex Mixtures
Jun 1, 2002 — According to scientists at the US Department of Energy's Ames Laboratory in Ames, Iowa, back-detection geometry may provide the key to opening up in vivo biological applications for a fluorescence-based chemical sensor. Developed in collaboration...
Hydrogels Form Tunable Photonic Crystals
Jun 1, 2002 — Using thermoresponsive hydrogel nanoparticles, researchers at Georgia Institute of Technology in Atlanta have formed colloidal photonic crystals that are color tunable by temperature-controlled particle compression. The crystals are formed from a...
Monomeric Thin-Film Layers Hold Polar Order
Jun 1, 2002 — Electro-optic modulators along fiber optic lines commonly use LiNbO3 or GaAs waveguides that are expensive and often limit bandwidth to 10 GHz. Using a hybrid covalent/ionic self-assembly process, researchers at Virginia Polytechnic Institute in...
Grooves Align Fiber and Crystal
Jun 1, 2002 — Researchers in upstate New York have developed a technique for attaching an optical fiber to a photonic crystal without using a tapered waveguide as an intermediary. The process incorporates stepped grooves in a silicon platform on which the...
Water/Propanol Solvent Makes 'Green' Lasers
Jun 1, 2002 — The volatility, flammability and other environmental hazards posed by solvents used in dye lasers, such as methanol and ethanol, have hindered the lasers' use in industrial applications. The refractive properties and benign nature of water would...
Film Integration Steps Closer to Flat Panel Application
Jun 1, 2002 — Three-color integration of rare-earth-doped GaN thin films may now be possible for use in flat panel displays. Using a combination of shadow-masking and photoresist-liftoff techniques, Don Lee and Andrew Steckl, researchers at the University of...
Microstructures Emit Coherent IR Radiation
Jun 1, 2002 — Thermal sources, such as a blackbody or the incandescent filament in a lightbulb, typically produce broadband, quasi-isotropic radiation. But a team at Centre National de la Recherche Scientifique in Châtenay-Malabry and Bagneux, France, and at...
VCSELs Pump Photonic Crystal Defect Lasers
Jun 1, 2002 — The potential for low-threshold pump power is one reason why photonic crystal de-fect lasers show promise for high-speed optical-interconnect applications. To validate just how low that threshold can go, scientists at the University of Southern...
Crystals Promise New Optical Materials
Jun 1, 2002 — Colloidal particles interest scientists because, although the particles are much larger than molecules, they often behave similarly. For example, they can be present in a solid, liquid or vapor phase, and like molecules, their phase behavior is...
Pulses May Yield Frequency-Entangled Photons
Jun 1, 2002 — According to scientists at Massachusetts Institute of Technology's Research Laboratory of Electronics in Cambridge, parametric down-conversion of short-pulse laser radiation in a periodically poled KTP crystal should yield a source of...
Technique Promises LCDs on Any Substrate
Jun 1, 2002 — Today's liquid crystal displays (LCDs) sandwich liquid crystal between two layers of material, typically glass. A technique developed by scientists at Philips Research Laboratories and Eindhoven University of Technology, both in Eindhoven, the...
Molecular Phase Modulation Generates <4-fs Pulses
Jun 1, 2002 — A group at Max Born Institut in Berlin have produced ultrashort optical pulses by molecular phase modulation in Raman-active gases. Unlike self-phase modulation, the technique should enable the control of the time-dependent phase of the pulses it...
Resistors Enable Adaptive Optics on the Cheap
Jun 1, 2002 — The term "adaptive optics" conjures images of complicated and expensive systems. Researchers at Delft University of Technology in the Netherlands hope to change that. In the May 1 issue of Optics Letters, they describe a deformable mirror driven...
Condensate Produces Atomic Solitons
Jun 1, 2002 — Researchers at Rice University in Houston have further explored the wave nature of matter by generating atomic solitons from a lithium Bose-Einstein condensate. The scientists, who described the work in the May 9 issue of Nature, created the first...
Colloids May Enable Integrated Photonic Circuits
Jun 1, 2002 — Thanks to researchers at the University of Toronto, photonic applications one day could run on groovy crystals. The crystals -- composed of colloidal spheres deposited on a grooved substrate -- could enable the creation of integrated photonic...
Laser Setup Challenges No-Cloning Rule
Jun 1, 2002 — The no-cloning rule, a consequence of quantum mechanics, states that no device can produce perfect copies of an unknown quantum mechanical sys-tem. Nevertheless, a system that fairly well copies any possible input state is possible in theory. Now, a...
Near-Field Microscope Manipulates Nanometer-Size Particles
Jun 1, 2002 — The use of optical fields to trap and manipulate particles is finding applications from atomic and nonlinear physics to biology. Most of the applications thus far, however, have involved particles no smaller than a micron in diameter. Now...
Imaging Combines Optical Modalities
Jun 1, 2002 — Optical coherence tomography (OCT) and its variant, optical Doppler tomography, have proved useful for the functional imaging of tissue physiology. However, if optical Doppler tomography is to be deployed in clinical settings, it must offer...
Optical Trap Produces Degenerate Fermi Gas
Jun 1, 2002 — A group of physicists at Duke University in Durham, N.C., has demonstrated an optical trap capable of creating an arbitrary spin-state degenerate Fermi gas. The work promises to offer researchers cold-gas analogs of high-temperature...
Photonics Probes Hydrogen Exchange
Jun 1, 2002 — Theorists at Durham University in the UK and experimentalists at Stanford University in California have joined forces to investigate the dynamics of the simplest and most studied of bimolecular reactions, the hydrogen-exchange reaction. In this...
Kenyan Operator Chooses LMDS Mobile Backhaul
May 31, 2002 — PARIS, May 31 -- Alcatel announced it has been awarded a contract by KenCell, a joint-venture of Vivendi Telecom International and Sameer Investment Ltd., a private investment group in Kenya, to deliver its local multipoint distribution service...
Satcom System Passes Flight Test
May 31, 2002 — LOS ANGELES, May 31 -- Teledyne Technologies Inc. said its Teledyne Controls business unit, together with EMS Technologies Inc., have successfully flight-tested EMS's High-Speed Data Satcom product, HSD-128, onboard a Dassault FalconJet 900EX. The...
Nortel Cuts More Jobs
May 31, 2002 — OTTAWA, Canada May 31 -- Nortel Networks Corp. has announced plans for 3500 more job cuts and further asset sales, including its fiber optics unit. The company also pared its revenue forecast and cut its break-even sales target to $3.2 billion from...
Daily News Briefs
May 31, 2002 — IPG Photonics of Burbach, Germany, announced it shipped its first commercial 350-watt diode-pumped fiber laser in March to an undisclosed European manufacturer for a materials processing application. Fiber lasers can be used for cutting, welding,...
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August 2024
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