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(38,322 articles)
Popular News
Curved CCDs to Scan Earth's Orbit
Nov 1, 2002 — Curved CCDs could improve the ability of telescopes to monitor and track debris and objects in geosynchronous orbit. A three-site deep-space surveillance constellation operated by the US Air Force already detects objects in space that are 10,000 times dimmer than the human eye can see. But a proposed $65 million demonstrator could include CCDs with curvature of a few hundred microns. This adaptation to the electro-optics could relax constraints on telescope design by accommodating wavefront...
Lasing Achieved with Doped DNA
Nov 1, 2002 — Researchers at the Chitose Institute of Science and Technology in Japan have doped DNA strands with a hemicyanine dye to create films capable of lasing. As reported in the Aug. 19 issue of Applied Physics Letters, the double-helix structure of the...
DC Sputtering Cuts Deposition Times and Costs
Nov 1, 2002 — KDF Inc. of Rockleigh, N.J., has developed a DC reactive sputtering process that promises to drastically reduce deposition times for dielectric films. Moreover, because it employs off-the-shelf components, it promises to offer this increased...
Digital Data-Hiding Pulls a Reverse
Nov 1, 2002 — The ability to easily modify and manipulate digital imagery has been beneficial to applications in the entertainment and consumer markets. However, this mutability poses problems in military, legal, medical and other fields where the accuracy and...
Cold Cathode Supports Flat Panel Displays
Nov 1, 2002 — Scientists at Tokyo University of Agriculture and Technology have developed a flicker-free solid-state cathode-ray tube that supports large, flat-screen devices. Unlike conventional cathode-ray tubes, which require bulky housing and which shoot...
Shaped CO2 Pulses Cleanly Ablate Silica Glass
Nov 1, 2002 — Although excimer and ultrafast laser technology can machine silica glass, the high average power and material removal rate of CO2 lasers is more practical for machining large surface areas, provided that feature sizes are greater than 10 µm....
Ultrafast Laser Chisels Lens Inside Glass
Nov 1, 2002 — In the classic magic trick, a magician asks a member of the audience to select a random card from a deck, and then seems to miraculously transport that card into a solid piece of ice or glass. Japanese researchers have performed their own version of...
Optical Trap Builds Microvalves
Nov 1, 2002 — Microfluidic devices have made chemical and biological analysis faster, more selective and less taxing on the supply of material under study. However, commonly used lithographic manufacturing methods cannot produce pumps and valves approximately 100...
Speckle Patterns Offer Secure Code Keys
Nov 1, 2002 — To ensure that secrets stay secret, information should flow easily in one direction but not in the reverse. Researchers at Massachusetts Institute of Technology in Cambridge suggest that using the speckle patterns that arise when a laser beam shines...
Flared Laser Produces 650 mW
Nov 1, 2002 — Researchers at the University of Illinois at Urbana-Champaign and Nuvonyx Inc. in Bridgeton, Mo., have developed a flared semiconductor laser in which the strength of the waveguide decreases as the width of the laser increases, resulting in optimal...
Confocal Raman Microscope Analyzes Reactions
Nov 1, 2002 — A team at the University of Utah in Salt Lake City has developed an inverted confocal Raman microscopy technique that may enable researchers to study chemical reactions on individual, optically trapped particles. The setup promises to improve...
Laser Array Traps and Manipulates Particles
Nov 1, 2002 — A technique that employs an array of vertical-cavity surface-emitting lasers (VCSELs) has demonstrated the ability to trap and manipulate microscopic particles using no moving parts. Developed by researchers at Osaka University in Suita, Japan, the...
Integrated Mode Converter Improves Fiber Coupling
Nov 1, 2002 — Researchers at the University of California at Santa Barbara have developed a simplified technique to monolithically incorporate mode converters into photonic integrated circuits, potentially providing a reliable, cost-effective method to couple the...
Video Catches Bubbles in Waves
Nov 1, 2002 — Researchers at Scripps Institution of Oceanography at the University of California, San Diego, in La Jolla have employed high-speed imaging to quantify the formation of bubbles in breaking waves. A better understanding of the process, which affects...
Modulation Improves Terahertz Spectroscopy
Nov 1, 2002 — Time-domain terahertz spectroscopy shows promise for applications in many disciplines, but the resolution threshold of the technique has been unsuitable for the analysis of thin films. Now a team at RWTH Aachen in Germany has incorporated modulation...
Polymers Extend Range of Blue Phase
Nov 1, 2002 — Blue-phase liquid crystals display much promise in photonics -- for example, in switching applications -- but their temperature sensitivity has made their deployment problematic. Now a team at Kyushu University, Precursory Research for Embryonic...
Near-Field Probes Offer 30-nm Resolution for Photoluminescence Imaging
Nov 1, 2002 — A group of scientists at Kanagawa Academy of Science and Technology, the University of Tsukuba and the Institute of Physical and Chemical Research (Riken), all in Japan, have demonstrated a spatial resolution of 30 nm in the photoluminescence...
Time-Reversal Mirror Offers Subwavelength Focusing
Nov 1, 2002 — Two researchers at Université Paris VII have reported that they have used an acoustic time-reversal mirror to achieve focal spots of less than λ/14. Although the experiment involved sound waves, the scientists are investigating the suitability...
Optical Tweezers Benefit from In Situ Laser Power Measurement
Nov 1, 2002 — With optical tweezers, the potential photodamage to cells or other biological tissues makes it important to know local laser power. Because the trapping force is proportional to the laser power at the objective focus, power measurement must be...
Nanoscale Optics Unhindered by Diffraction Limit
Nov 1, 2002 — As optics designers strive to shrink photonic devices to nanoscale size, they must contend with the fact that diffraction restricts the minimum lateral dimensions of dielectric optical elements and waveguides to about half the effective light...
Matter Wave Collapses and Revives
Nov 1, 2002 — While a Bose-Einstein condensate may represent the most classical form of a matter wave, the wave field has a quantized structure that is related to the granularity of the discrete underlying atoms. It isn't necessarily stable when the condensate is...
Deposition Forms Buried Grating
Nov 1, 2002 — Scientists at the University of California at Berkeley have formed a buried oxide grating by growing selectively oxidized AlGaAs on nonplanar GaAs structures. In the experiment, detailed in the Sept. 23 issue of Optics Express, they patterned the...
X-ray Imaging Offers High Spatial Resolution
Nov 1, 2002 — Building on the fact that x-ray illumination excites electrons that generate photochromic effects, a large photoconductivity and a bulk photovoltaic current, a research team at the University of Bonn in Germany designed an x-ray imaging system with...
Daily News Briefs
Oct 31, 2002 — Raytheon Co. has appointed Sue Baumgarten as president of Raytheon International Inc. She replaces Hansel Tookes, who is retiring. . . . Brashear LP has selected Three-Five Systems' Brillian Z86D-3 microdisplays to be the primary display in the...
Opto Speed Completes Funding Round
Oct 31, 2002 — RUSCHLIKON, Switzerland, Oct. 31 -- Opto Speed, a developer and manufacturer of optoelectronic modules for the communications, test and measurement, medical and defense markets, announced that ABN AMRO Capital has participated in €20 million...
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August 2024
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