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Research & Technology News

Distributed Feedback Lasers Studied
Jan 1, 2003 — In response to the increase in Internet traffic, researchers at NEC Corp. in Shiga, Japan, are investigating low-cost, high-performance distributed feedback lasers for use in metropolitan area and access networks. They have demonstrated that the phase shift in distributed feedback corrugations affects the directly modulated lasers' chirping characteristics and external optical feedback resistance as a result of feedback. Researchers at NEC Corp. have investigated the relationship among...
Efficient Silicon LED Demonstrated
Jan 1, 2003 — Researchers at STMicroelectronics in Catania, Italy, have reported the development of a silicon LED with what they claim is a world-record emission efficiency. To make the device, Salvo Coffa and his colleagues used ions of rare-earth metals such as...
Electronic Nose Uses Standard Monitor
Jan 1, 2003 — An electronic nose under development at Linköping University in Sweden may be able to detect the odors of spoiled food in your kitchen before you catch a whiff of them. An offshoot of the scanning light pulsed technique, in which a scanning laser...
Electrons Accelerated to 200 MeV
Jan 1, 2003 — In pursuit of more powerful particle accelerators, a research team has accelerated electrons using an ultrafast Ti:sapphire laser by the forced laser wake field regime. The demonstration, by scientists from Imperial College of Science in London and...
Encapsulation Key to In Vivo Imaging
Jan 1, 2003 — Recent research indicates that quantum dots could someday replace fluorescent markers, such as organic dyes and fluorescent proteins, in some biological imaging applications. To compete, though, these nanometer-scale semiconductor crystallites must...
Filament Cores Observed on Sun
Jan 1, 2003 — Using a new 1-m telescope on the island of La Palma in the Canary Islands, solar astronomers from the Royal Swedish Academy of Sciences in Stockholm have investigated heretofore-unseen structures in sunspots. The Swedish-designed and -built...
Lasers Simulate Astronomical Phenomena
Jan 1, 2003 — The magnetic fields produced in the interaction of intense laser pulses and dense plasmas may enable researchers to test models of neutron stars and white dwarfs in the lab, suggests a team of European scientists. The group, which includes...
Light Determines Crystal Phase
Jan 1, 2003 — Chemists at Polytechnic University in New York and Illinois Institute of Technology in Chicago have used infrared radiation to produce crystalline phases that depend on the polarization of the light. The phenomenon may offer a "green" industrial...
Liquid Crystal Offers Flexible Laser
Jan 1, 2003 — A new liquid crystal laser offers avenues to new applications, suggest scientists at Osaka University in Suita, Japan. They reported the device in the Nov. 11 issue of Applied Physics Letters. To fabricate the laser, they injected a mixture of...
MagiQ Readies Quantum Code System
Jan 1, 2003 — MagiQ Technologies Inc. of New York has announced plans for the commercial release of its Navajo quantum cryptography product. The quantum key distribution system will transmit entangled photons over fiber optics, enabling users to create secure...
Models Suggest Integrated Photonic Circuits
Jan 1, 2003 — A group of researchers at the University of Alabama in Huntsville has reported in the Nov. 18 Optics Express that integrating conventional waveguides and photonic crystal structures can produce compact integrated photonic circuits. To illustrate the...
Motion Sensors Compensate for Image Blurring
Jan 1, 2003 — Using integrated accelerometers to detect the vibration in an imaging system, suggest researchers at Ben-Gurion University of the Negev in Beersheba, Israel, offers an accurate means to correct for displacement and blur. In a report of the technique...
Nd:YVO4 Laser Offers 200 kHz
Jan 1, 2003 — Advanced Optical Technology Ltd. of Basildon, UK, has reported the development of a 200-kHz electro-optically Q-switched laser. Such high-repetition-rate devices may find use in industrial, medical and telecommunications applications. Sharing in the...
Networked Computers Support Data-Intensive Applications
Jan 1, 2003 — Massive amounts of data from multiple storage sites connected by optical networks can be interactively visualized, analyzed and correlated with the OptIPuter, a distributed computer under development in a project headed by the California Institute...
New Liquid Crystal Opens Optical Applications
Jan 1, 2003 — A group at the University of Central Florida in Orlando has developed a type of polymer-dispersed liquid crystal that offers a gradient droplet size distribution. The gradient refractive index profile can act as switchable prism gratings, as well as...
New Materials Enable Dense Data Storage
Jan 1, 2003 — A team at Boston College in Chestnut Hill, Mass., and Massachusetts Institute of Technology in Cambridge has discovered a class of materials that may offer an efficient and robust method of ultradense data storage based on multiphoton absorption....
Optical Technique Probes MEMS Performance
Jan 1, 2003 — A new excitation/detection method based on light pressure and interferometric profiling can characterize a microelectromechanical systems (MEMS) gimballed mirror array. Besides enabling accurate, noninvasive process monitoring, the all-optical...
Plastic Electro-Optic Modulators Show Potential
Jan 1, 2003 — Although the need for modulation at terahertz rates for telecommunications may be years away, researchers at Lucent Technologies' Bell Labs in Murray Hill, N.J., are working on plastic electro-optic modulators to do just that. Recently, Mark Lee and...
Quantum Dots, Photonic Crystal Form LED
Jan 1, 2003 — Scientists at the University of Michigan in Ann Arbor have reported an electrically driven LED comprising InAs/GaAs quantum dots in a GaAs photonic crystal structure. They described the fabrication and operation of the 1.04-µm emitter in the Nov. 11...
Reflectivity Yields Fresnel Lenses
Jan 1, 2003 — Continuing their work with photoinduced reflectivity, scientists at W.W. Hansen Experimental Physics Laboratory at Stanford University in California have produced transient diffractive optical elements in semiconductor wafers by optical stimulation....
Satellite Images Plankton Bloom
Jan 1, 2003 — Images from the Envisat satellite released by the European Space Agency displayed a 300 x 200-km phytoplankton bloom in the seas off Nova Scotia and Newfoundland in Canada from July 24 to Aug. 13, 2002. Although such blooms are not uncommon, they...
Seaborne Reactors May Affect Neutrino Experiments
Jan 1, 2003 — Physicists at Stanford University in California suggest in the Nov. 4 Physical Review Letters that the neutrinos produced by nuclear reactors on naval vessels may interfere with neutrino oscillation research. They note, however, that Russian nuclear...
Semiconducting Wires Improve Polymer LEDs
Jan 1, 2003 — European researchers have performed a balancing act that may lead to inexpensive and large-scale illumination, low-power and expansive flat panel displays, and other applications of polymer light-emitting devices. Traditionally, polymer LED design...
Spectra Identify Nanotube Species
Jan 1, 2003 — Chemists at Rice University in Houston have reported that spectrofluorometry is an effective tool in identifying various species of single-walled carbon nanotubes. They suggest that the technique may be used to guide the selective production of...
Spectroscopy Probes Fuel Flames
Jan 1, 2003 — Rogier Evertsen of the University of Nijmegen in the Netherlands has demonstrated the suitability of cavity ringdown spectroscopy for the analysis of the combustion products of fuel flames. In a report of the work that appeared as his doctoral...

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