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(9,093 items)
Research & Technology News
Photoacoustics Targets Medicine
Oct 1, 2002 — Photoacoustics, or laser-generated ultrasonic pulses in solid or liquid media, have been used for years in nondestructive testing, process monitoring and materials characterization. Researchers from Northwestern University in Evanston, Ill., have described several improvements that may increase their suitability for nondestructive testing and biomedical applications such as laser-generated ultrasound. In the Aug. 1 issue of Applied Optics, they describe several sources consisting of a laser...
Physicists Produce Photons Ideal for Quantum Networking
Oct 1, 2002 — Physicists at the Max Planck Institute for Quantum Optics in Garching, Germany, have used a rubidium atom that was strongly coupled to a high-finesse optical cavity (above) to produce, on demand, a sequence of single photons with well-defined and...
Plasmon Transmission Retains Photon Entanglement
Oct 1, 2002 — Entangled photons stay entangled, even after being converted to plasmons, according to the findings of researchers at Leiden University in the Netherlands. They used glass/gold arrays that, at holes in the gold interface (right), convert photons...
Scientists Report Single-Molecule Electroluminescence
Oct 1, 2002 — Building on earlier research at Georgia Institute of Technology in Atlanta that demonstrated the optical storage potential of thin films containing silver nanoclusters, one of the scientists from that study has coaxed photon emissions from...
Stressed VCSEL Displays Stable Polarization
Oct 1, 2002 — When it comes to polarization, VCSELs, or vertical-cavity surface-emitting lasers, can't make up their minds. The devices are circular and symmetrical, but their constituent semiconductor materials have two crystal orientations, so the laser output...
Tweezers Catch and Analyze Particles
Oct 1, 2002 — Researchers at East Carolina University in Greenville, N.C., have developed a combined laser tweezers and Raman spectroscopy technique that enables them to capture and measure both transparent and nontransparent particles. The system could prove...
Amplifier Switching Time Shortened Tenfold
Sep 1, 2002 — A technique that makes "turn on/turn off" switching times for network semiconductor optical amplifiers 10 times faster has been developed by researchers from the University of Campinas in Brazil. The group added 150-ps electrical pulses to the...
Australian Researchers Teleport Laser Beam
Sep 1, 2002 — A team from the Australian National University in Canberra has reported the successful quantum teleportation of a laser beam using two Einstein-Podolsky-Rosen entangled laser beams. The method, which was similar to that used by California Institute...
Clock Measures Attosecond Pulses
Sep 1, 2002 — Scientists at Université de Sherbrooke in Sherbrooke, Quebec, Canada, and at the National Research Council in Ottawa are using double ionization to measure the strength and duration of the attosecond electron pulses created by intense infrared laser...
Evidence Found for Magnetars
Sep 1, 2002 — The mysterious stellar objects known as anomalous x-ray pulsars can put out x-ray luminosities that are orders of magnitude larger than what should be produced by their rotational energy loss. One of the most popular theories for this is that the...
Gaussian Telescope Aperture Improves Contrast
Sep 1, 2002 — Changing the aperture of a telescope has allowed researchers from Pennsylvania State University in University Park to find a star previously hidden by a brighter star. The team, led by Jian Ge, mounted a metal disc with 12 Gaussian-shaped holes...
Laser Diode Provides High-Power Pulses
Sep 1, 2002 — Researchers have constructed a laser diode capable of generating approximately 100-W, picosecond-range pulses by using an AlGaAs layer as a potential barrier between the structure's PN junction and gain region. The barrier slows down the...
Laser Powers Paper Airplanes
Sep 1, 2002 — A laser-based propulsion system for ultralight aircraft has been demonstrated by researchers at Tokyo Institute of Technology. The technique, which they reported in the June 10 issue of Applied Physics Letters, may find applications in the...
Laser Produces Better Road Signs
Sep 1, 2002 — Most of us acknowledge the messages on roadway signs, and we speed by without giving them another thought. But researchers at Zhejiang University in Hangzhou, China, are working hard to improve signage technology to better catch our eye. They have...
Laser Tweezers Rotate Microscopic Rotors
Sep 1, 2002 — Researchers at the Institute of Biophysics in Szeged, Hungary, have employed laser tweezers to bi-directionally rotate a microscopic rotor made of a polymerized resin. The team created a rotor approximately 5 µm in diameter by performing...
Opaque Layer Improves Light Output
Sep 1, 2002 — Attempting to improve an organic LED's light output by covering its top with an opaque, 50-nm-thick layer of silver may seem a little nonsensical, but the technique has allowed researchers at the University of Rochester in New York to increase the...
Optical Trapping Tests Particles at Oil-Water Barrier
Sep 1, 2002 — Scientists at Hull University, the CLRC in Didcot and Imperial Chemical Industries in Middlesborough, all in the UK, have measured the repulsive force between two charged polystyrene particles in an oil-water interface as it relates to their...
Photons Spin More Data
Sep 1, 2002 — For years, physicists have known that photons can exhibit orbital angular momentum. Spin manifests when a photon's transverse components are out of phase, whereas orbital angular momentum affects the entire phase front of the beam. The mechanical...
Quantum Cascade Laser Amplifier Developed
Sep 1, 2002 — Scientists from Bell Labs in Murray Hill, N.J., have developed an amplifier for quantum cascade lasers that can achieve high-power single-mode emission at a wavelength of 7.4 µm. They used an InGaAs/InAlAs/InP semiconductor amplifier, also based...
Researchers Form Liquid-Light Theory
Sep 1, 2002 — Beams of light can be collimated, split or chirped -- and now, some researchers say they can even be liquefied. Based on the assumption that a laser beam can be thought of as a gaseous stream of photons, the researchers, from the Universidade de...
Researchers Probe Chemistry of Bubbles
Sep 1, 2002 — Since luminescence in single cavitating bubbles was described more than a decade ago, the phenomenon has attracted much attention from scientists. Earlier this year, interest was piqued all the more, when a team at Oak Ridge National Laboratory in...
Self-Assembly Eases Fabrication of Photonic Crystals
Sep 1, 2002 — Devices constructed of photonic crystals promise to enable the precise, localized control of optical propagation. The fabrication of such crystals usually involves a complex and expensive multistep process. However, researchers at the University of...
Spectroscopy Bares Nanoparticle Structure
Sep 1, 2002 — Sometimes you need a bigger laser to study smaller particles. Specifically, a group of Dutch researchers applied a free-electron laser to study nanoparticles representing matter between the atomic and bulk states. Infrared spectroscopy...
Spectroscopy Tracks Vibrational Energy in Liquids
Sep 1, 2002 — Using ultrafast anti-Stokes Raman spectroscopy, chemists at the University of Illinois in Urbana-Champaign have developed a spectroscopic method for tracking the flow of vibrational energy through the chemical bonds of molecules in the liquid state....
Tabletop Source Offers Extreme Ultraviolet
Sep 1, 2002 — Generating laserlike beams of x-rays from a simple tabletop setup, a team based at the University of Colorado's JILA in Boulder has demonstrated the ability to perform extreme-ultraviolet holography. "Lasers in the visible region of the spectrum...
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July 2024
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