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Research & Technology News
Lasers Add Lines to Capillary Electrophoresis
Mar 1, 2002 — Laser-induced native fluorescence detection in capillary electrophoresis has opened new applications and areas of research, but the technology has been forced to rely on either mainframe lasers or frequency-doubled Ar-ion or Kr-ion lasers. Although effective, these lasers can cost tens of thousands of dollars. Hollow cathode lasers, such as NeCu and HeAg sources, are roughly the same size and weight as HeNe lasers and consume about the same amount of power, but they emit at several...
Liquid Crystal Films Controlled with Viruses
Mar 1, 2002 — A virus is going around the laboratory of Angela Belcher, a chemist at the University of Texas in Austin who has discovered that the microscopic organisms can be manipulated to organize the optical particles in a liquid crystalline film. The...
Lithium Lens Focuses X-Rays
Mar 1, 2002 — With a little extra care, researchers at the University of Michigan in Ann Arbor, Ecopulse Inc. in Springfield, Va., and the US Army Research Laboratory in Adelphi, Md., have expanded the materials from which a lens can be made. The team has...
Model Identifies Limits on Filters
Mar 1, 2002 — Fiber optic cables carrying multiple channels of light rely on a number of precision devices, including tunable narrow-bandwidth filters. But the process of manufacturing such filters is tricky and prone to defects. Now researchers have developed a...
Near-Field Microscopy Catches Smallest Laser in Action
Mar 1, 2002 — Using a near-field scanning optical microscope, researchers at the University of California in Berkeley have captured images of tiny nanowire lasers in action. Led by Richard Saykally, they have applied a combination of femtosecond spectroscopy and...
Phase-Shifting Interferometry Measures Surfaces
Mar 1, 2002 — There are no good vibrations when it comes to precise surface measurements. Mirrors, for instance, are often manufactured to specifications of fractions of a wavelength, and that requires surface measurement resolutions of better than 100 nm....
Plasma Spectroscopy Monitors Welds
Mar 1, 2002 — Researchers from Università degli Studie Politecnico di Bari and from Istituto Nazionale per la Fisica della Materia, both in Bari, Italy, have developed a nonintrusive sensor system to monitor laser welding in real time. By spectroscopically...
Silicon on Sapphire Speeds Chip Communication
Mar 1, 2002 — The insulating properties of sapphire have been heralded as a boon to smaller, low-power chip design, but researchers at Johns Hopkins University in Baltimore are focusing on the gem's optical potential for laser chip communication at speeds a...
Spectroscopy Probes Attosecond World
Mar 1, 2002 — Researchers have probed the microworld with femtosecond spectroscopy, enabling them to investigate nuclear motion at its 10- to 20-fs timescale. Now a team from Technische Universität Wien in Vienna, Austria, Steacie Institute of Molecular Sciences...
Straightness of Pipes Gauged Online
Mar 1, 2002 — A machine vision system that uses a pair of line-structured lasers and two CCD cameras could improve the speed and accuracy of inspecting the straightness of seamless steel pipes. One of the last steps in pipe production involves taping the ends,...
Super-Gaussian Distribution Produced in CO2 Laser
Mar 1, 2002 — Physicists from Moscow State University and from the adaptive optics group of the Institute on Laser and Information Technologies at the Russian Academy of Sciences in Shatura have produced specified fourth- and sixth-order super-Gaussian...
X-Rays May Pluck Pairs from Vacuum
Mar 1, 2002 — According to quantum electrodynamics, a vacuum is never empty but rather is seething with virtual pairs of electrons and positrons. A team from Universität Tübingen in Tübingen, Germany, and Argonne National Laboratory in Argonne, Ill., predicts...
'Bar Code' Tags Aid Bioanalysis
Feb 1, 2002 — Biochemical reactions involve hundreds, sometimes thousands, of unique molecules. Fluorescent markers can be targeted toward specific molecules, but only a handful of spectrally distinct markers can feasibly be identified simultaneously in solution....
Fast Protons Generated with Double-Layer Foil Targets
Feb 1, 2002 — Using 1-ps pulses from an Nd:glass laser, researchers have shown that double-layer thin foils containing a high atomic number front layer and a low atomic number, hydrogen-rich back layer can generate fast protons with greater energies and current...
Function Designed to Authenticate Name Seals
Feb 1, 2002 — In China, a person must have a name seal to perform everyday functions such as withdrawing money from a bank, but visually authenticating the seals can take 5 to 10 minutes. To speed up the process, researchers from Yuan Ze University in Taiwan have...
Infiltrated Crystal Offers Tunable Bandgap
Feb 1, 2002 — Researchers in Katsumi Yoshino's group at Osaka University in Suita, Japan, have demonstrated photonic bandgap tunability in synthetic opal infiltrated with liquid crystal. They also have produced a tunable inverse opal, promising applications in...
InP Nanowires Act as Detectors
Feb 1, 2002 — They have been shown to work as LEDs, but indium-phosphide nanowires may also find a place in optical interconnects. A research team at Harvard University in Cambridge, Mass., has discovered that the nanowires exhibit different optical properties...
Interference Photolithography Produces Photonic Crystals
Feb 1, 2002 — A team from Pennsylvania State University in University Park has developed an interference-photolithography method to produce 2-D photonic crystal structures. The scientists fabricated the 0.8- to 2.0-µm-period titania arrays by exposing a...
Laser Assesses Particle Charge in Plasma
Feb 1, 2002 — Understanding the charge carried by particles in plasma is of keen interest to those investigating plasma environments ranging from thin-film production to interstellar clouds. However, most experimental methods of testing this property require a...
Laser Controls Surface Reactions
Feb 1, 2002 — The ability to manage the location and timing of chemical reactions is key to advanced industrial and biochemical processes. A new laser technique promises unprecedented control over surface reactions. Although it is relatively easy to create the...
Laser Cooling Crystallizes Ion Beams
Feb 1, 2002 — Beams of accelerated ions are important tools in the investigation of atomic structures. The problem is that the ions collide while being accelerated and while in a magnetic storage ring, which reduces the quality of the beam. Now researchers at...
MEMS Adaptive Optics Offer 11,000 Iterations per Second
Feb 1, 2002 — Mirrors based on microelectromechanical systems (MEMS) promise to meet the requirements of adaptive optics, but standard control-system architectures cannot fully utilize their speed and size advantages. A new integrated MEMS mirror array and very...
Microfacet Laser Displays 0.3-mW, 401-nm Operation
Feb 1, 2002 — Group III nitrides such as AlN, GaN and InN feature wide, direct bandgaps that make them particularly useful for ultraviolet and visible laser diodes. However, the conventional mirror-fabrication techniques tend to produce facets that are neither...
Microstructured Fibers Reviewed
Feb 1, 2002 — Microstructured optical fibers are not new, but interest has revived because of their potential applications in fields such as optical communications and optical coherence tomography. In an article in the Dec. 17 issue of Optics Express, researchers...
Modeling Optimizes MOEMS Production
Feb 1, 2002 — Miniaturized optoelectronic systems are an attractive choice for applications from telecommunications to inertial sensing. The setup costs for manufacturing micro-optoelectromechanical systems (MOEMS) are high, however, and economies of scale...
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January 2025
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