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(38,166 articles)
Popular News
Fast Light, Slow Light and Optical Precursors: What Does It All Mean?
Jan 1, 2007 — The speed of light in vacuum (c ≈ 3 × 108 m/s) is an important physical constant that appears in Maxwell’s theory of electromagnetism. For this reason, scientists have endeavored to measure it with very high precision, making it one of the most accurately known of all physical constants. The situation becomes murkier for a slightly different situation: Send a pulse of light through a dispersive optical material rather than vacuum, and bizarre things start to appear. For
Forecast for 2007: Nano Gets Big
Jan 1, 2007 — Not long ago, nanometer-scale positioning was a laboratory curiosity. Today, the robust and responsive nanopositioning provided by piezoelectric actuation is more vital than ever in the lab and has become an essential commodity for industries...
A Laser’s Force Dampens Cantilever Action
Jan 1, 2007 — David M. Weld and Aharon Kapitulnik of Stanford University in California recently demonstrated that even low-power lasers pack a punch. Using laser-driven radiation pressure force-feedback, they reduced the effective quality factor and temperature...
Sharp Corners and Kaleidoscopes Lead to Novel Microscopy Techniques
Jan 1, 2007 — Researchers at Harvard Medical School in Boston have developed two microscopy techniques: a near-field method that offers potentially better performance than other superresolution techniques and a “mirror tunnel” approach that promises...
Intrazeolite PbS Quantum Dots with Nonlinear Properties Observed
Jan 1, 2007 — At Sogang University in Seoul, South Korea, scientists have successfully incorporated lead sulfide quantum dots into zeolite-Y films and found high levels of third-order nonlinear optical activity. The material could be used for optical switches,...
Silicon Nanowires Act as Nanoscale Avalanche Photodetectors
Jan 1, 2007 — Researchers at Harvard University in Cambridge, Mass., have synthesized PIN silicon nanowires with single-crystal structures and uniform diameters that demonstrate potential for use as avalanche photodetectors in integrated photonic systems. The...
White Polymer LEDs Incorporate New Dopant
Jan 1, 2007 — Researchers at the Chinese Academy of Sciences in Beijing and at the University of California, Los Angeles, have demonstrated white LEDs that feature emission layers of the orange-emitting polymer...
Playing Rough to Get the Light Out
Jan 1, 2007 — Researchers at the Electronics and Telecommunications Research Institute of Daejeon, South Korea, have shown that, when it comes to getting a silicon quantum dot LED to shine, it helps to play rough — at least with the surface. The group enhanced...
Searching for the Source of Stradivari’s Sublime Sound
Jan 1, 2007 — Musicians and listeners alike have debated for centuries why instruments crafted by Italian master Antonio Stradivari have such a sublime sound. Modern technology may at last have found the answer. Researchers used solid-state nuclear magnetic...
Cavity-Enhanced Absorption Spectroscopy
Detects Geothermal Gases
Jan 1, 2007 — Gas phase chromatography and mass spectrometry often are used to analyze volcanic emissions because of their ability to detect low levels of trace gases. However, these techniques are limited by their instrumental complexity and inability to...
Transient Form of Two-Dimensional IR Spectroscopy
Shows Molecules in Motion
Jan 1, 2007 — Understanding the way that molecules operate means digging deeply — examining not only their structures, but also how they change shape under various conditions. Techniques such as nuclear magnetic resonance and x-ray crystallography help...
Correlating Excitation and Emission Wavelengths Yields Analysis of Complex Chemical Environments
Jan 1, 2007 — Spectroscopically scrutinizing chemicals within complex environments — such as inside cometary matter or combustible materials — is challenging because many molecules absorb and emit at similar wavelengths, confounding spectral analysis....
Tiny Dichroic Mirror Can Boost Frequency-Doubling Efficiency
Jan 1, 2007 — The second-harmonic conversion efficiency of gallium arsenide can be several times as great as that of conventional nonlinear crystals such as lithium niobate. Moreover, because semiconductor lasers also can be fabricated from the material, the...
Neodymium Vanadate Lasers Get Even Better
Jan 1, 2007 — Neodymium vanadate lasers have found broad acceptance in materials processing, displays and other applications as a result of their high gain, polarized output and high optical efficiency. Recently, scientists at Technische Universität...
End-Pumping Fiber Amplifiers Made Easy
Jan 1, 2007 — A collaboration among Czech scientists has developed an approach to the end pumping of fiber amplifiers that, despite its need for an unusual fiber geometry, may significantly enhance the ruggedness and cost-effectiveness of the amplifiers in...
Brookhaven Scientists Named American Physical Society Fellows
Dec 29, 2006 — Five scientists at Brookhaven National Laboratory (BNL) on Long Island, N.Y., have been named Fellows of the American Physical Society (APS). Tim Hallman, Chi-Chang Kao, Dmitri Kharzeev, William Morse and Yimei Zhu were elected in recognition of...
Awards Give Boost to UK Physics Research
SWINDON, England, Dec. 29, 2006 -- Seven Science and Innovation Awards totaling more than £12 million ($23 million) include funding to allow three United Kingdom universities to collaborate on quantum coherence and will help two other schools establish a new research center on...
Omega Optical: Manufacturing ‘Green’ Optical Filters
BRATTLEBORO, Vt., Dec. 29, 2006 -- Since 1969, Omega Optical has built its technical reputation on defining the state-of-the-art for optical interference filter performance, manufacturing optical filters for scientists and instrument manufacturers worldwide. From biotech to...
Telecom in Asia Slowly Recovering After Quakes
HONG KONG, Dec. 28, 2006 -- Asia's telecommunications system is slowly recovering after Tuesday's powerful earthquakes and aftershocks snapped undersea fiber optic cables and created one of the biggest telecommunications outages the region has seen for years. While much of...
Study: Nanomaterials Could Disperse into Environment
ATLANTA, Dec. 28, 2006 -- Experiments show that a nanomaterial promising for industrial uses also has significant potential to be dispersed in aquatic environments -- especially when natural organic materials are present. When mixed with natural organic matter in water...
Light Fields Mapped Microscopically
SEOUL, South Korea, Dec. 28, 2006 -- Researchers at Seoul National University said they have, for the first time, mapped the orientation of light fields on a microscopic scale, United Press International (UPI) reported recently. PhD candidate Kwang Geol Lee's team built a...
Kodak to Unveil Plans for Health Group, Inkjet Market Before Feb. 8
Dec 28, 2006 — Eastman Kodak Co. is making "significant progress" toward completing its study of alternatives for its Health Group, and expects to make a public announcement on or before Feb. 8, company chairman and CEO Antonio M. Perez said yesterday. The...
SwRI Device Named Engineering Landmark
SAN ANTONIO, Dec. 28, 2006 -- A device developed by engineers at Southwest Research Institute (SwRI) in 1962 that characterizes the dynamic response of materials at high strain rates has been designated a historic mechanical engineering landmark by the American Society of...
'Vortex Lattices' May Help Explain Material Defects
BOULDER, Colo., Dec. 27, 2006 -- By superimposing a rotating pattern of intersecting laser beams on a spinning cloud of ultracold atoms in a thin gas, scientists have created a new technique that could be used to simulate why and how defects arise in superconductors, which are...
Lasers Reveal Strange Properties of Superfluids
PRINCETON, N.J., Dec. 27, 2006 -- Electrical engineers are using lasers to shed light on the behavior of superfluids -- strange, frictionless liquids that are difficult to create and study. Their technique allows them to simulate experiments that are difficult or impossible to...
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May 2024
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