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Research & Technology News
Microlenses Offer Atom Interferometers
Feb 1, 2003 — A team at Universität Hannover in Germany has produced interferometer structures for atoms by focusing the near-IR output of a Ti:sapphire laser through arrays of microlenses to generate patterns of optical dipole potentials. The work, which appeared in the Nov. 25 issue of Physical Review Letters, promises to enable the development of miniaturized sensors based on atom interferometry. Arrays of cylindrical microlenses patterned in fused silica focused 360 mW of the red-detuned output of the...
Nanowire Heterostructures Form Tunneling Diodes
Feb 1, 2003 — Continuing their research into nanoscale semiconductor heterostructures known as nanowires, a team at Lund University in Sweden has produced one-dimensional resonant tunneling diodes that display nearly ideal current-to-voltage characteristics. The...
Nichia, Sony Jointly Develop 405-nm Diodes
Feb 1, 2003 — Nichia Corp. of Anan, Japan, and Sony Corp. of Tokyo have announced a cooperative agreement under which they will develop 405-nm laser diodes for use in optical video recording applications. The companies hope to offer the lasers in mass quantities...
Organic LED Features Quantum Dots
Feb 1, 2003 — A quantum-dot sandwich on the menu at Massachusetts Institute of Technology in Cambridge promises to boost the performance of organic LEDs. The device, which features a layer of CdSe nanocrystals squeezed between two organic thin films, displays a...
Photonic Crystal Improves Mid-IR Generation
Feb 1, 2003 — A photonic crystal designed into a silicon wafer promises users the ability to controllably generate radiation at mid-infrared wavelengths. The emitter, developed by Ion Optics Inc. in Waltham, Mass., in conjunction with researchers at the Jet...
Probes Enhance Microscopy
Feb 1, 2003 — Researchers at Max Planck Institut für Biochemie in Martinsried, Germany, have developed a probe design that improves the resolution of near-field scanning optical microscopes. The tip-on-aperture probes combine the benefits of aperture and...
Proteins Used in Nanoscale Templates
Feb 1, 2003 — The future of electronic and photonic devices will be based on two-dimensional arrays of quantum dots, according to a team of researchers. The scientists, based at NASA Ames Research Center in Moffett Field, Calif., the SETI Institute in Mountain...
Quantum Wire Exhibits Lasing
Feb 1, 2003 — Gallium-arsenide quantum wires produced with a novel crystal growth technique have demonstrated single-mode lasing. At low energies, one-dimensional active gain regions are expected to have a higher density of states than their two- or...
Simulation Reveals Ablation Mechanisms
Feb 1, 2003 — To better understand laser ablation, researchers at the University of Montreal have developed a novel method to simulate thermodynamic trajectories of groups of atoms in a solid. The behavior of the atoms reveals the instabilities that result in the...
Trapping Center Controls Spin Direction
Feb 1, 2003 — In continuing work on the development of optically driven micromotors, physicists at Kyoto University in Japan have demonstrated that the location of the trapping center determines the direction of rotation of a chiral object. They reported their...
Triangular-Aperture Probe Boosts Resolution
Feb 1, 2003 — Researchers at Universität Münster in Germany have demonstrated a probe for near-field scanning optical microscopy that effectively doubles resolution capability without compromising brightness. They presented the triangular-aperture probe in the...
Two-Photon Process Probes Circuits
Feb 1, 2003 — Sometimes two photons are better than one. A new two-photon-absorption technique developed at the US Naval Research Laboratory in Washington for testing the radiation sensitivity of semiconductors could lead to more robust integrated circuits for...
Waveguide Generates Coherent EUV
Feb 1, 2003 — Nonlinear optics can convert laser light from one wavelength to another, but the process often requires phase matching to be efficient. Unfortunately, in high-harmonic generation of coherent extreme-ultraviolet radiation, it has not been possible to...
White Organic LED Has Single Emission Layer
Feb 1, 2003 — Researchers at Academia Sinica in Taipei, Taiwan, have fabricated a bright-white organic LED with a single emission layer. With a simple three-layer structure, the device generated white light with maximum brightness approaching 42,000 cd/m2 at 14 V...
Deposition Achieves 12 nm/cycle
Jan 1, 2003 — A team of scientists at Harvard University in Cambridge, Mass., has demonstrated an atomic layer deposition process that yields conformal layers of amorphous silicon dioxide and aluminum oxide nanolaminates at a rate of 12 nm per 30-second cycle....
Diffractive Optics Produce Pseudoscopic Images
Jan 1, 2003 — Physicists at Universidade Estadual de Campinas in Brazil have generated pseudoscopic images using a pair of diffractive optical elements and a slit. They suggest that the findings, which they reported in the Nov. 18 Optics Express, indicate that...
Distributed Feedback Lasers Studied
Jan 1, 2003 — In response to the increase in Internet traffic, researchers at NEC Corp. in Shiga, Japan, are investigating low-cost, high-performance distributed feedback lasers for use in metropolitan area and access networks. They have demonstrated that the...
Efficient Silicon LED Demonstrated
Jan 1, 2003 — Researchers at STMicroelectronics in Catania, Italy, have reported the development of a silicon LED with what they claim is a world-record emission efficiency. To make the device, Salvo Coffa and his colleagues used ions of rare-earth metals such as...
Electronic Nose Uses Standard Monitor
Jan 1, 2003 — An electronic nose under development at Linköping University in Sweden may be able to detect the odors of spoiled food in your kitchen before you catch a whiff of them. An offshoot of the scanning light pulsed technique, in which a scanning laser...
Electrons Accelerated to 200 MeV
Jan 1, 2003 — In pursuit of more powerful particle accelerators, a research team has accelerated electrons using an ultrafast Ti:sapphire laser by the forced laser wake field regime. The demonstration, by scientists from Imperial College of Science in London and...
Encapsulation Key to In Vivo Imaging
Jan 1, 2003 — Recent research indicates that quantum dots could someday replace fluorescent markers, such as organic dyes and fluorescent proteins, in some biological imaging applications. To compete, though, these nanometer-scale semiconductor crystallites must...
Filament Cores Observed on Sun
Jan 1, 2003 — Using a new 1-m telescope on the island of La Palma in the Canary Islands, solar astronomers from the Royal Swedish Academy of Sciences in Stockholm have investigated heretofore-unseen structures in sunspots. The Swedish-designed and -built...
Lasers Simulate Astronomical Phenomena
Jan 1, 2003 — The magnetic fields produced in the interaction of intense laser pulses and dense plasmas may enable researchers to test models of neutron stars and white dwarfs in the lab, suggests a team of European scientists. The group, which includes...
Light Determines Crystal Phase
Jan 1, 2003 — Chemists at Polytechnic University in New York and Illinois Institute of Technology in Chicago have used infrared radiation to produce crystalline phases that depend on the polarization of the light. The phenomenon may offer a "green" industrial...
Liquid Crystal Offers Flexible Laser
Jan 1, 2003 — A new liquid crystal laser offers avenues to new applications, suggest scientists at Osaka University in Suita, Japan. They reported the device in the Nov. 11 issue of Applied Physics Letters. To fabricate the laser, they injected a mixture of...
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