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(9,094 items)
Research & Technology News
Silver Superlens Achieves 60-nm Resolution
Jun 1, 2005 — Scientists at the University of California, Berkeley, have realized a resolution of 60 nm using a film of silver as a superlens, and they demonstrated it by imaging the word "NANO" and an array of nanowires. Researchers imaged the word "NANO" using a silver superlens. The word contains lines approximately 40 nm wide. The red line shows the enhancement of the evanescent waves. Image by Cheng Sun of the University of California, Berkeley. Instead of imaging the propagating light from an...
Wavelength Tuning of MEMS VCSEL Proposed
Jun 1, 2005 — Engineers at the University of California, Berkeley, have designed and analyzed -- but not built -- a microelectromechanical system (MEMS) vertical-cavity surface-emitting laser (VCSEL) whose wavelength could be tuned using a unique piezoelectric...
Condensates Coaxed to Exhibit Unique Interference
May 1, 2005 — Thomas Young's classic setup for the demonstration of interference features light from one source incident on two vertical slits because the phenomenon occurs only if the light from the slits has a well-defined relative phase. Now a group at the...
Diamond Grown on Optical Fiber for Waveguiding
May 1, 2005 — Scientists at the University of Melbourne in Australia report in the March 28 issue of Applied Physics Letters the waveguiding of the nitrogen-vacancy color center fluorescence in diamond microcrystals grown on optical fiber. They grew the diamond...
Fiber Ring Laser Generates 50 Simultaneous Wavelengths
May 1, 2005 — A scientist at Exfo Electro-Optical Engineering Inc. in Vanier, Quebec, Canada, has demonstrated a simple fiber ring laser capable of generating 50 simultaneous wavelengths uniformly spaced at 50 GHz between 1308 and 1322 nm. Such a laser could be...
Gas Sample Cell Based on Photonic Bandgap Fiber
May 1, 2005 — By splicing a single-mode fiber to each end of a gas-filled, hollow-core, photonic bandgap fiber, researchers at the University of Bath in the UK have created a gas cell with unprecedented interaction efficiency between the sample and light. They...
Ink-Jet Technique Produces Microvessels and Microlenses
May 1, 2005 — Researchers at Max Planck Institut für Polymerforschung in Mainz and Universität Siegen, both in Germany, have fabricated microvessels and microlenses using an ink-jet method that deposits droplets of a solvent onto a polymer substrate. The approach...
Multiwavelength Laser Utilizes Erbium-Doped Fiber Amplifier
May 1, 2005 — Multiwavelength lasers are important for testing wavelength division multiplexing telecommunications systems and for other applications in metrology and sensing. Two readily available gain media have the broad gain bandwidth necessary for a...
Plasma Treatment Fine-Tunes Micro-Ring Resonance
May 1, 2005 — Waveguide micro-ring resonators are attractive components for many integrated optical applications, such as filtering, dispersion compensation, multiplexing and wavelength conversion. When employed as a notch filter, for example, a micro-ring...
Silicon Nanowires Make Ultratiny Directional Couplers
May 1, 2005 — As several laboratories around the world pursue silicon lasers, other researchers are exploring a variety of silicon-based optical components. Directional couplers are the basic building blocks for a host of optical devices, from multiplexers to...
Silver Superlens Enables Subdiffraction-Limit Imaging
May 1, 2005 — Lens resolution can never be too flat or too thin. At least, that's one conclusion that can be drawn from recent research at the University of Canterbury in Christchurch, New Zealand. Electrical and computer engineering associate professor Richard...
Theorists Propose an All-Optical Transistor
May 1, 2005 — Optical computers -- computers in which photons replace the electrons of today's machines -- are expected to bring huge improvements in terms of compactness and speed and to yield unimaginable improvements in technology. Optical computing exists...
Thinking Beyond Stripes in Flat Panel Displays
May 1, 2005 — Thomas L. Credelle, vice president of engineering at Clairvoyante Inc. in Cupertino, Calif., has spent the past few years trying to convince flat panel display manufacturers that they do not have to resort to massive investments in next-generation...
CdS/ZnS Nanocrystals Display Blue Lasing
Apr 1, 2005 — Scientists at Massachusetts Institute of Technology in Cambridge have observed room-temperature amplified spontaneous emission tunable between approximately 450 and 500 nm and lasing centered near 480 nm from optically pumped CdS/ZnS composite...
Coherent 1-nm X-Rays Generated in Helium
Apr 1, 2005 — Harmonic generation has been a workhorse of the photonics community for decades, creating coherent short-wavelength light from longer-wavelength lasers. Today, the market is awash with 532-nm lasers -- including green laser pointers -- whose output...
Crylas GmbH Designates North American Agent
Apr 1, 2005 — Crylas GmbH of Berlin, a supplier of passively Q-switched diode-pumped solid-state lasers for OEM, research and life sciences applications, has appointed Market Tech Inc. of Scotts Valley, Calif., as its exclusive North American distributor. Market...
Inorganic Materials Form Nanotubes, Concentric Fullerenes
Apr 1, 2005 — Researchers investigating nanostructures of layered inorganic compounds have theorized that these materials should spontaneously form tubes and concentric fullerenes similar to those observed in graphite exposed to an electron beam. Now a team from...
Microlens Arrays Enable Parallel Nanofabrication
Apr 1, 2005 — Scientists at Riken research institute in Wako and at Osaka University in Suita, both in Japan, have demonstrated a laser-based nanofabrication technique that promises a hundredfold or more boost in productivity over general laser scanning systems....
More Breakthroughs with Silicon Lasers
Apr 1, 2005 — These are heady times for silicon lasers and their developers. Shortly after a team at the University of California, Los Angeles, reported the first silicon laser last fall, a group from Intel Corp. in Santa Clara, Calif., and Jerusalem reported a...
Proposed Doublet Lens Improves Depth of Focus
Apr 1, 2005 — One barrier to introducing imaging systems into new, practical industrial applications is the need for precise alignment. Outside of the laboratory, natural variations in object distance result in reduced resolutions or require real-time focus...
Quantum Cascade Raman Laser May Offer Mid-IR Tunability
Apr 1, 2005 — By integrating a Raman laser into the same band-structure-engineered crystal as a quantum cascade laser, a collaboration of researchers in the US has realized a promising approach to a compact, wavelength-tunable, mid-IR laser. Lasers in the mid-IR...
Two-Dimensional Silver Patterns Produced from Nanoparticles by Laser Fabrication
Apr 1, 2005 — A team at Boston College has fabricated structures of agglomerated silver nanoparticles using multiphoton absorption laser fabrication, with potential applications in optics. To produce the structures, the researchers illuminated polymer and...
Gigahertz Semiconductor Laser Performance Surpasses Conventional Solid-State Lasers
Mar 1, 2005 — Stable multiwatt lasers with gigahertz pulsed outputs have potential application in telecommunications and in optical clocking, but conventional solid-state lasers, which are capable of such performance, are too large and too expensive for these...
InGaN Laser Diodes Grown by Molecular Beam Epitaxy
Mar 1, 2005 — Despite its potential advantages over metallorganic chemical vapor deposition, molecular beam epitaxy has until recently been considered unsuitable for the production of InGaN-based emitters such as blue-violet laser diodes for next-generation...
Interferometric Measurements Set Requirements for Adaptive Optical Microscopy
Mar 1, 2005 — Adaptive optics has a record of success with regard to improving the performance of optical systems in high-aberration environments. Whether correcting for atmospheric turbulence, thermal gradients or aberrations in the cornea and lens of the human...
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