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Research & Technology News

Micromachined Laser Offers Tunability
SINGAPORE -- SINGAPORE -- In the hope of adding flexibility to optical communications networks, researchers at Nanyang Technological University have micromachined an external-cavity Fabry-Perot laser diode that is wavelength-tunable. In the May issue of IEEE Photonics Technology Letters, the researchers describe the design of the 2 x 1.5-mm package, which incorporates a movable micromirror. The mirror was produced by three-layer-polysilicon micromachining processes and was manually lifted to its final...
Nanotubes Offer New Light
LAUSANNE, Switzerland -- LAUSANNE, Switzerland -- It is not often that researchers reinvent the lightbulb. Scientists at École Polytechnique Fédérale de Lausanne have constructed a luminescent tube with the output of commercial fluorescent offerings,...
Nanowires Sniff Out TNT
Aug 1, 2001 — With millions of unexploded land mines and bombs left scattered around the world from various conflicts, there is a humanitarian need for a low-cost technology that can locate these threats to civilians. Researchers at the University of California...
New on DVD: Photonic Transistors
TSUKUBA, Japan -- TSUKUBA, Japan -- The ability of one electrical current or field to amplify another underlies the electronics industry’s primary advantage over photonics: the transistor. By modulating electrical fields, transistors create the electronic...
OPO Displays 8-kHz Linewidth
Aug 1, 2001 — A research group at the University of Konstanz in Germany has generated infrared light with 8-kHz linewidth from the OS 4000 optical parametric oscillator (OPO) from Linos Photonics GbmH of Planegg, Germany. The university team says that such...
Photoacoustics Detects Water in Oil
Aug 1, 2001 — Water contamination in lubrication and hydraulic oils is one of the primary causes of destructive wear and corrosion in machinery, making early detection desirable. Fourier transform infrared spectroscopy can detect water in oil at concentrations as...
Router Promises Faster Switching
DAVIS, Calif. -- DAVIS, Calif. -- An all-optical data network scheduled to be built later this year at the University of California may herald the future of the Internet: unbelievably fast switching that could make the promise of real-time, 3-D videoconferencing and...
Scientists Investigate Light-Emitting Bubbles
LOS ANGELES -- LOS ANGELES -- What do sound waves, water bubbles and photons have in common? They are the primary players in sonoluminescence, a phenomenon in which the tiny bubbles created by intense acoustic fields in water emit light as they collapse. It also...
Smart Cameras Aim Themselves
CHAMPAIGN, Ill. -- CHAMPAIGN, Ill. -- Researchers at the University of Illinois at Urbana-Champaign are borrowing Mother Nature’s tricks to make cameras with a brain. The result could be systems that distinguish birds from planes or that automatically aim...
Sony Tests Dual-Wavelength Laser
KANAGAWA, Japan -- KANAGAWA, Japan -- If your kids are whiling away their summer break playing games on a Sony PlaySta-tion 2, then you have seen the company’s latest laser diode in action. Sony Corp.’s Semiconductor Laser Div. had developed a monolithic...
Vision Systems Stamp Out Bushfires
MELBOURNE, Australia -- MELBOURNE, Australia -- The threat of bushfires looms large in southern Australia. An airborne vision system under development may make prevention easier by targeting one of the leading causes of fire: contact between power lines and tree branches...
X-Rays Expose Nonthermal Melting
PALAISEAU, France -- PALAISEAU, France -- Using time-resolved x-ray spectroscopy, researchers at Laboratoire d’Optique Appliquée have observed nonthermal melting in InSb. The work illustrates the expanding application of time-resolved femtosecond...
Better Robots See like a Spider
PASADENA, Calif. -- PASADENA, Calif. -- How do you increase resolution and decrease fixed pattern noise in a robot’s vision while using fewer photoreceptors? By borrowing an idea from the tropical jumping spider, say researchers Oliver D. Landolt and Ania Mitros....
Cameras Promise a Look at Space Experiments
MOUNTAIN VIEW, Calif. -- MOUNTAIN VIEW, Calif. -- One justification for the multibillion-dollar International Space Station is that it is an orbiting laboratory. Rather than constructing a different satellite to conduct each experiment, researchers can use the resources on...
Free-Electron Laser Reaches Saturation
Jul 1, 2001 — A research team at Argonne National Laboratory in Argonne, Ill., has reported saturation at the 530- and 385-nm wavelengths in its free-electron laser, which is based on self-amplified spontaneous emission. In a saturated free-electron laser, the...
Fringe Technology Benefits Interferometric Lithography
CHRISTCHURCH, New Zealand -- CHRISTCHURCH, New Zealand -- Like the circuitry on integrated chips, the periodic stripes etched on laser diodes are shrinking. It is intuitive that reducing feature dimensions is simply a matter of reducing the illumination wavelength of a...
Hologram on Display in Texas
Jul 1, 2001 — The first of three sections of a "Texas-size" hologram has been installed over the baggage claim area of Barbara Jordan Terminal at Austin-Bergstrom International Airport in Austin, Texas. Donated by Samsung Austin Semiconductor, Zebra Imaging Inc....
Imaging Finds Defects in Tiles
BRISTOL, UK -- BRISTOL, UK -- A challenge for tile manufacturers is detecting hard-to-spot defects and blemishes amid the randomly colored patterns on the tiles. Despite the push toward automation in the industry, quality control has remained a manual operation,...
Infrared Ovens Make Quick Work of Asphalt Testing
FAYETTEVILLE, Ark. -- FAYETTEVILLE, Ark. -- No one likes driving on a road pitted with ruts and potholes. One way to ensure smooth roads is to use good asphalt, and the key to high-quality asphalt is achieving the proper proportions of aggregate, air and binder. Too much...
Interference Challenges Quantum Computing
Jul 1, 2001 — A research team at the University of Rochester in New York has demonstrated that computing by optical interference may be as efficient as proposed quantum computing schemes. The team reported the work in May at CLEO/QELS 2001 in Baltimore. To...
Is the Airborne Laser Allergic to Dust?
NEGEV, Israel -- NEGEV, Israel -- America’s $11.3 billion Airborne Laser missile defense program could be defeated by dust, said researcher Natan (Norman) S. Kopeika of Ben-Gurion University. An artist’s rendition of the Airborne Laser system in action...
Laser Ablation Generates Nanoparticles
AUSTIN, Texas -- AUSTIN, Texas -- Nanoparticles are finding diverse application as devices such as biological sensors, and they show potential as the basis of novel LEDs. Typically, nanometer-size particles are grown through vapor condensation or flame or spray...
Laser Light Enables 3-D Doping
KONSTANZ, Germany -- KONSTANZ, Germany -- Laser diodes, light-emitting diodes and photovoltaic cells all have one thing in common: They consist of semiconductor chips, which necessarily contain electronic bandgaps. Light can be used to dope structures at the nanoscale...
Light Drives Molecular Piston
AMSTERDAM, Netherlands -- AMSTERDAM, Netherlands -- Advancing the development of micromachines, researchers from the Netherlands, Italy and the UK have constructed the world’s smallest piston. Powered by laser light, the molecule-size piston can move objects a few...
Light Powers Micromachines
SUDBURY, Ontario, Canada -- SUDBURY, Ontario, Canada -- Machines based on microelectromechanical systems (MEMS) and micro-optoelectromechanical systems show promise for innumerable applications. Some macroscopic structures can be scaled to microscopic dimensions; however, the...

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