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(38,337 articles)
Popular News
Tandem Blue OLEDs Display High Efficiencies
Jul 1, 2006 — Researchers from Eastman Kodak Co. in Rochester, N.Y., have reported luminous efficiencies of 20 and 38 cd/A with external quantum efficiencies of greater than 11 percent from tandem organic LEDs (OLEDs) emitting in the blue region of the spectrum. They presented their findings at the Society for Information Display’s 44th annual International Symposium, Seminar and Exhibition in San Francisco. The tandem emitters incorporated the company’s OLED materials and featured electroluminescent...
Passivated Carbon Nanoparticles Show Promise for Multiplexed Biolabeling
Jul 1, 2006 — Although semiconductor quantum dots have shown promise as bright fluorescent labels, concerns about their toxicity remain, particularly for biological uses. Now a group of scientists at Clemson University in South Carolina has demonstrated that...
Superconducting Detector Collects Terahertz Radiation
Jul 1, 2006 — Detecting terahertz radiation is a chore. Terahertz waves are of interest for a variety of imaging applications because they do not interact strongly with many materials, but if they are not absorbed, they cannot be detected. Now researchers in...
Subdiffraction-Limit Microscopy Exposes Vesicle Dynamics
Jul 1, 2006 — Using a variant of fluorescence microscopy that enables subdiffraction-limit resolutions, scientists at Max Planck Institut für Biophysikalische Chemie in Göttingen, Germany, have imaged synaptic vesicle recycling in cultured neurons. The...
Feedback-Based Imaging Enables Miniature Scanning Confocal Microscopes
Jul 1, 2006 — As part of their work toward the development of a handheld scanning confocal microscope, researchers at Institut Femto-ST (Franche-Comté Electronique Mecanique Thermique et Optique — Sciences et Technologies) at Université de Franche-Comté in...
Photonic Crystal Improves Output of Quantum Dot Films
Jul 1, 2006 — The addition of a 2-D photonic crystal to the surface of LED structures boosts the output of these devices by freeing light that otherwise would be trapped inside. A team of scientists from the University of California, Santa Barbara, and from...
Microscopy Probes Dielectric Constant of Nanostructured Films
Jul 1, 2006 — Using near-field scanning optical microscopy, researchers from Argonne National Laboratory in Illinois have imaged the interference patterns of surface plasmons on silver nanostructured thin films, enabling them to measure the local plasmon...
Cryogenic Laser Photolithography Finds Quantum Dot Registration
Jul 1, 2006 — In quantum dot information processing, it is critical to be able to register the position of a single quantum dot with respect to the antinode of a defect (missing hole) in a photonic crystal to create strong coupling and cavity quantum...
Fourier Transform Infrared Spectroscopy Exposes Self-Assembly
of Mesoporous Thin Films
Jul 1, 2006 — The low index of refraction and ultralow dielectric constant of mesoporous ceramic thin films make the materials of interest for a variety of applications in optics and electronics. Now a spectroscopic technique has demonstrated the ability to...
Time-Resolved Near-IR Spectroscopy Probes Potential Jump at Electrochemical Interface
Jul 1, 2006 — The electrochemical interface where a solid meets a solution is of interest in the development of biosensors and fuel cells because it is where electron transfer occurs between electrodes and molecules. The techniques used to study reaction dynamics...
Polymer OLEDs Match Small-Molecule Efficiencies
Jul 1, 2006 — Researchers from Universität zu Köln and Universität Potsdam, both in Germany, have developed polymer-based organic LEDs (OLEDs) that display an internal quantum efficiency approaching 100 percent and external quantum efficiencies that match the...
Nanotube Sheet Employed as OLED Electrode
Jul 1, 2006 — Organic LEDs (OLEDs) incorporating an anode made from a thin sheet of single-walled carbon nanotubes display performance similar to that of devices that employ indium tin oxide, report investigators in Montreal. The finding offers device designers...
Picosecond Fiber Laser Breaks 100-W Barrier
Jul 1, 2006 — Fiber lasers already have proved capable of remarkable continuous-wave performance, generating more than 1 kW with excellent beam quality. Scientists at the University of Southampton and at Southampton Photonics in the UK now have shown that fiber...
Microcavity Is Sensitive Detector for Heavy Water
Jul 1, 2006 — Researchers at California Institute of Technology in Pasadena have demonstrated a technique for detecting heavy water (D2O) that is 30 times more sensitive than the best competing approach. They fashioned a tiny optical microresonator from silica...
Liquid Deformable Mirror Promises Fast Wavefront Correction
Jul 1, 2006 — Deformable mirrors offer the possibility of compensating for atmospheric optical distortion, an important function both for astronomy and for directed-energy military applications. Conventional deformable mirrors, which rely on the bending and...
New Ytterbium Host Offers Efficiency and Tunability
Jul 1, 2006 — The broad absorption and emission spectra of ytterbium, together with its small quantum defect, make it an ideal laser dopant — in many ways, it is superior to the quintessential veteran, neodymium. The chief drawback of ytterbium is the small...
Continuous-Wave Solid-State Dye Laser Is Demonstrated
Jul 1, 2006 — Dye lasers have been around since the 1970s and have been instrumental in many applications, especially spectroscopy and medicine. But they are complex devices, requiring bulky pumps and tubing to circulate the liquid dye through the system. A...
Waveguide Generates and Modulates Second Harmonic
Jul 1, 2006 — Researchers at Kyushu University in Fukuoka, Japan, have analyzed and demonstrated a quasi-phase-matched lithium-niobate waveguide that incorporates an integrated electro-optic modulator. The compact, monolithic device could find applications in...
Photonic Bandgap Fiber Forces a Weak Line to Lase
Jul 1, 2006 — Both the fundamental wavelength of the neodymium 4F3/2 → 4I9/2 transition (890 to 950 nm) and its second harmonic have applications in spectroscopy, and the harmonic also is useful in displays and medical sensing. Quasi-phase matching makes it...
PCI Motion Control in Microscope Automation
Jul 1, 2006 — Over the past 15 years, microscopes have been transformed from devices for which the operator had to adjust the stage position, focus, filters and shutters by hand, into advanced systems in which these functions are automated. This has paved the...
How Much Energy Are You Throwing Away?
Jul 1, 2006 — The Gaussian beam profile of a TEM00 laser is suitable for many applications. For targeting and alignment, the peaked Gaussian beam enables pinpoint precision. However, it is not ideal for other applications, including lithography, biomedical...
Darkness on the Edge of Your Images
Jul 1, 2006 — Numerous image sensor manufacturers are producing digital sensors that match the size of slide and negative films. Such sensors work with standard camera peripheral equipment such as lenses and flashes, which have existed for some time, and most...
Measuring 3-D Semiconductor Packaging
Jul 1, 2006 — Since the early 1900s, science and industry professionals have been using optical measurement and inspection for a clearer view of their products for research, development and manufacturing. These techniques of observing, measuring and analyzing...
Aluminum Nitride LED Produces 210-nm Radiation
Jul 1, 2006 — Suggesting applications in the elimination of environmental toxins, investigators at NTT Basic Research Laboratories in Atsugi, Japan, have reported the development of an AlN PIN homojunction LED that emits 210-nm radiation. With the proper choice...
Phosphor Placement in White LED Packages
Jul 1, 2006 — To be useful in lighting applications and to compete with traditional light sources, the white LED must show further increases in luminous efficacy and in the amount of light generated by a single device. Currently, commercial white LEDs are...
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August 2024
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