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(38,284 articles)
Popular News
New Twist: Lasers Could Help Create Larger Microchips
May 1, 1998 — Microchip and display companies are showing interest in a variation on a laser micromachining technique that creates large-area, low-defect crystalline silicon films. Liquid crystal displays and microchips use amorphous silicon as the substrate for control chips and microprocessors. The material is relatively easy to make, cheap and plentiful, but crystal defects limit the performance of these devices. A better option would be crystalline or single crystal silicon, but manufacturing processes...
Stained-Glass Physics Help Detect HIV
May 1, 1998 — Sheldon Schultz, a scientist at the University of California at San Diego, has used "plasmon resonant particles" to detect HIV antibodies in blood samples. When particles resonate in this way, they absorb the wavelengths that set off the...
Imaging Diagnoses Complex Chips
May 1, 1998 — Today's typical microprocessor is a complex creature. The continuing trend toward faster, smaller and denser CMOS circuits does not help engineers measure a chip's signals for possible defects. Traditional inspection methods, which involve probing...
Arsenic Sulfide Eyed for Thermal Imaging
May 1, 1998 — An ideal lens for a thermal imaging system would be both lightweight and inexpensive, while immune to incident wavelengths and temperatures. A team of British scientists from the Defence Research Agency in Worcestershire, Pilkington Optronics in...
Researchers Find Privacy in Chaos
May 1, 1998 — Communication can be chaotic enough when the communicators stand face to face. Introducing technology into the equation can sometimes aggravate potential misunderstandings. Who, then, would want to throw even more chaos into the communication...
Fiber Image Guide Offers Subwavelength Resolution
May 1, 1998 — Scientists at the NEC Research Institute in Princeton, N.J., have demonstrated a new type of fiber image guide comprising individual fibers with core diameters as small as 250 nm. By using fibers with a large difference in the index of refraction...
Photoluminescence Improves LCDs
May 1, 1998 — Although electroluminescent, plasma and fluorescent technologies present certain advantages, liquid crystal displays (LCDs) continue to dominate the flat panel display industry. Liquid crystal's low power consumption, low-voltage operation and...
Laser Ablation Creates Nanowires
May 1, 1998 — An Nd:YAG laser is one tool in a new technique that creates nanometer-scale "wires" for atomic microscopy and submicron electronics. Chemistry Professor Charles M. Lieber and graduate student Alfredo M. Morales of Harvard University took a novel...
Laser Technique Polishes Glass Lenses
May 1, 1998 — Glass's high infrared absorption could prove a boon to a new laser technique that can polish both symmetric and asymmetric glass lenses faster than mechanical techniques. Ferran Laguarta and his associates at the Universitat Politècnica de...
Filter Helps Predict Solar Flares
May 1, 1998 — Although it has been making tunable etalons since 1978, Queensgate Instruments Ltd. has outdone itself by developing a 150-mm etalon as part of a system that will enhance the US Air Force's ability to predict solar flares. In helping the Air...
Probing the 'Glory Ring' Mystery
May 1, 1998 — Ever notice bright, colored rings around a distant airplane? Researchers have described this phenomenon as a strong backscattering of light by droplets of water. While the theory was well-developed, it remained difficult to verify experimentally....
Engineers Produce Fluorescing, Self-Assembled Molecules
May 1, 1998 — In recent years, engineers have worked to develop molecules through a technique known as "self-assembly," where molecules join to form much larger functioning objects. Now engineers from the University of Rochester in Rochester, N.Y., have taken...
Physicist Pushes Multilayer CDs
May 1, 1998 — A Russian-born physicist, who emigrated from the Soviet Union more than two decades ago, has persuaded the Russian parliament to invest in a company that would manufacture multilayer fluorescent discs. Eugene Levich heads two firms that have shares...
Lasers Restore Classic Cars
May 1, 1998 — The Fraunhofer Institute for Laser Technology in Aachen, Germany, restores classic roadsters, such as vintage Jaguars, using a new laser coating technique. For the last year, engineers have repaired defective turbine components, worn gears and...
Fluorescence Spectroscopy Reveals Cell's Components
May 1, 1998 — A team of researchers at the University of Illinois has employed fluorescence spectroscopy to find and analyze compounds crucial to cell metabolism. Traditionally, scientists trying to detect compounds such as serotonin or tryptamine in animal cells...
Laser Searches for Downed Aircraft
May 1, 1998 — When it comes to finding downed airplanes or sinking boats, time is critical. The faster rescuers locate the disabled vehicle, the better the chance of finding survivors. Researchers at Daedalus Enterprises Inc. are working on a system that lets...
Photons Squeeze Through Tiny Holes
May 1, 1998 — Ask most chip-makers today what they think about using photolithography for submicron components, and they'll say it has reached its limits. The small mask openings required to make equally small features do not allow the necessary light to pass...
Photorefractive Volume Gratings Stabilize Wavelengths
May 1, 1998 — A research team from the National Research Laboratory of Metrology in Tsukuba, Japan, has stabilized the wavelengths of two diode lasers by using two photorefractive volume gratings in one lithium niobate (LiNbO3) crystal. Both wavelengths exhibited...
Microcavity Tunes over Visible Spectrum
May 1, 1998 — A team of researchers from Cambridge University in the UK has built a microcavity that could be suitable as an efficient and tunable wavelength converter. The cavity enhances the rate of emission at the resonance wavelengths of the cavity while...
Continental Laser Unveils Powerful Sealed CO2 Laser
May 1, 1998 — A new class of highly efficient, multikilowatt CO2 lasers designed for material processing could have a far-reaching impact on the sealed-flow gas laser market. Alexander Krasnov, founder of Continental Laser Energy, says he has developed a compact,...
Spatial Light Modulator Yields Full-Color Images
May 1, 1998 — A standard silicon wafer is the key to a technology that could make possible miniature, low-power, color displays, such as those used in portable or headmounted devices. Developed by researchers at the University of Edinburgh in the UK, the...
Blue Lasers Aim at Optical Data Storage, Display Markets
Apr 1, 1998 — In the latest entry in the race to develop a high-power blue laser, SDL Inc. has introduced a semiconductor laser based on gallium nitride. The San Jose, Calif.-based company's entry emits at multiple wavelengths between 400 and 410 nm and features...
Component Manufacturer Puts the Bend in Optical Fiber
Apr 1, 1998 — As the photonics industry marches toward miniaturization, one component manufacturer plans to improve telecommunications technology with a way to create 180° optical fiber bends with low losses and small diameters. Thomas & Betts Corp. of...
Microscope Looks into Centrifuge
Apr 1, 1998 — Researchers at the Marine Biological Laboratory have designed a microscope that allows scientists to see the alignment of molecules in a sample as it spins at high speed in a centrifuge. With this device, scientists will be able to see the changes...
Scientists Synchronize Chaotic Lasers
Apr 1, 1998 — In the early 1990s, two scientists at the Georgia Institute of Technology in Atlanta, Rajarshi Roy and K. Scott Thornburg, made breakthroughs in controlling the chaotic fluctuations in light intensity in certain laser systems. Now Roy has reported...
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