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Research & Technology News
Filter Proposed for Quantum Network
Jul 1, 2002 — Researchers at Hokkaido University in Sapporo, Japan, have developed a scheme for an optical filter involving linear optics and single-photon counters that would transmit photon pairs only if they share the same linear polarization. As reported in the April 8 issue of Physical Review Letters, the filter would be insensitive to the individual polarization of the photons, making it capable of preserving and creating entanglement between the photons. The researchers predict that, if...
Holey Fiber Laser Produces 10 mW
Jul 1, 2002 — A research team at Max Born Institut für Nichtlineare Optik und Kurzzeitspektroskopie in Berlin has demonstrated laser action from a neodymium-doped holey fiber that it believes may find applications in amplifying ultrashort laser pulses. Peter...
IR Two-Photon Process Creates Acids
Jul 1, 2002 — Two-photon absorption techniques show promise for such applications as microfabrication. But although researchers have examined ultraviolet-sensitive photoacid generators for use in two-photon microfabrication, these agents typically exhibit low...
Is There a Perfect Lens?
Jul 1, 2002 — According to researchers at the University of Texas at Austin and at Consejo Superior de Investigaciones Cientificas in Madrid, Spain, the reports of the death of the diffraction limit may have been greatly exaggerated. In independent reports, their...
Lawrence Livermore Builds 28-km Air-Optic Link
Jul 1, 2002 — Scientists at Lawrence Livermore National Laboratory in Livermore, Calif., have successfully established a 28-km-long air-optics link between the laboratory and nearby Mount Diablo. One of the longest such high-capacity laser communications links...
Light Fuels the First Single-Molecule Machine
Jul 1, 2002 — The first man-made single-molecule machine has proved it can do mechanical work, according to its German builders. Hermann Gaub, a researcher with the University of Munich's Nanoscience Center and a member of the project team that developed the...
Liquid Polymer Provides Gain for Optical Amplifier
Jul 1, 2002 — At St. Andrews University in the UK, research-ers have constructed a broadband optical amplifier using a dilute solution of the conjugated polymer OC1C10-PPV as a gain medium. They expect that the liquid amplifier will be a stepping-stone to...
Microscopy Images High-Density Quantum Dots
Jul 1, 2002 — Scientists at Seoul National University in Korea and at the University of Tokyo have developed a technique with which they can perform high-resolution photoluminescence microscopy of high-density InAs/GaAs quantum dots. The work promises to advance...
MIT Develops Flexible Dielectric Fibers
Jul 1, 2002 — Fashion and photonics may seem an unlikely combination to inspire a product from the laboratories of Massachusetts Institute of Technology in Cambridge. However, blending the low-cost, high-volume processing techniques of polymer fibers found in...
Optical Trapping Expands to 3-D
Jul 1, 2002 — Since the mid-80s, optical tweezers have helped study the physics behind a myriad of microscopic phenomena ranging from DNA elasticity to micromachines. However, the effectively planar nature of the optical trapping effect -- a clear object being...
Photoactive Molecules Enable Optical Logic
Jul 1, 2002 — For high-speed telecommunications, electronics are a drag. The optoelectronic devices that control today's networks threaten to choke the terabit-per-second data rates that soon will be available. In hopes of avoiding such logjams, a research team...
Semiconductor Laser Emits 67-µm Radiation
Jul 1, 2002 — A quantum-cascade laser developed by researchers in Italy and the UK may herald the shape of things to come. The device, which emits 4.4-THz radiation, demonstrates that semiconductor laser technology is suitable not only for visible and...
Shake-and-Bake Technique Builds Displays
Jul 1, 2002 — Researchers at the University of Minnesota in Minneapolis and at Harvard University in Cambridge, Mass., have developed a self-assembly technique that may enable the manufacture of novel displays. According to the scientists, the shake-and-bake...
SID Sizzles with Organic LED Displays
Jul 1, 2002 — There's no question that organic LED technology was the star at the 2002 Society of Information Display (SID) show held in Boston in May. Whether the technology promoted by exhibitors was full-color (Samsung SDI Corp. of Seoul, Korea; Universal...
TV/CCD Combination Measures Wavefronts
Jul 1, 2002 — Using a television monitor and a CCD camera, researchers at the Universidad Complutense de Madrid in Spain have developed a simple, flexible and low-cost method of analyzing the wavefront properties of lenses and other optical elements. They place...
Vulcan to Produce Petawatt Pulses
Jul 1, 2002 — The Nd:glass Vulcan laser at Rutherford Appleton Laboratory near Oxford, UK, was scheduled to produce its first petawatt-level laser pulse by June 30. At full operation, the near-IR laser is expected to produce about one 500-J, 500-fs pulse an hour,...
Colloids May Enable Integrated Photonic Circuits
Jun 1, 2002 — Thanks to researchers at the University of Toronto, photonic applications one day could run on groovy crystals. The crystals -- composed of colloidal spheres deposited on a grooved substrate -- could enable the creation of integrated photonic...
Crystals Promise New Optical Materials
Jun 1, 2002 — Colloidal particles interest scientists because, although the particles are much larger than molecules, they often behave similarly. For example, they can be present in a solid, liquid or vapor phase, and like molecules, their phase behavior is...
Fiber Optics Upgrades Cryptography
Jun 1, 2002 — An autocompensating quantum cryptography technique based upon manipulating a pulse of light split into equal orthogonally polarized components has received a significant upgrade with the integration of fiber optics into the coding/decoding...
Film Integration Steps Closer to Flat Panel Application
Jun 1, 2002 — Three-color integration of rare-earth-doped GaN thin films may now be possible for use in flat panel displays. Using a combination of shadow-masking and photoresist-liftoff techniques, Don Lee and Andrew Steckl, researchers at the University of...
Grooves Align Fiber and Crystal
Jun 1, 2002 — Researchers in upstate New York have developed a technique for attaching an optical fiber to a photonic crystal without using a tapered waveguide as an intermediary. The process incorporates stepped grooves in a silicon platform on which the...
Hydrogels Form Tunable Photonic Crystals
Jun 1, 2002 — Using thermoresponsive hydrogel nanoparticles, researchers at Georgia Institute of Technology in Atlanta have formed colloidal photonic crystals that are color tunable by temperature-controlled particle compression. The crystals are formed from a...
Imaging Combines Optical Modalities
Jun 1, 2002 — Optical coherence tomography (OCT) and its variant, optical Doppler tomography, have proved useful for the functional imaging of tissue physiology. However, if optical Doppler tomography is to be deployed in clinical settings, it must offer...
Ink-Jet Simplifies Organic LED Design
Jun 1, 2002 — Researchers at the University of Arizona in Tucson have developed an ink-jet printing method for constructing organic LEDs that does not require a special mask or prepatterning of a substrate's surface. A user designs a pattern on a computer,...
Laser Setup Challenges No-Cloning Rule
Jun 1, 2002 — The no-cloning rule, a consequence of quantum mechanics, states that no device can produce perfect copies of an unknown quantum mechanical sys-tem. Nevertheless, a system that fairly well copies any possible input state is possible in theory. Now, a...
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