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(38,322 articles)
Popular News
Terahertz Beam Shaping Is Demonstrated
Mar 1, 2003 — The region of the spectrum between long-wave infrared and microwaves promises significant applications in structural imaging, telecommunications and molecular spectroscopy. Detectors and sources of terahertz radiation do not yet approach the capabilities of devices in higher- and lower-frequency regimes, but a group at Massachusetts Institute of Technology in Cambridge has demonstrated the ability to generate, direct and amplify terahertz waves in a nonlinear optical crystal. Pulses from a...
Code System Employs Laser Pulses
Mar 1, 2003 — A team of researchers at Centre National de la Recherche Scientifique (CNRS) in Orsay, France, and at Université Libre de Bruxelles in Brussels, Belgium, has demonstrated a quantum cryptography system that encodes its information on the electric...
'Spaser' Shakes Up the Nanoworld
Mar 1, 2003 — Researchers at Georgia State University in Atlanta and Tel Aviv University in Israel have proposed a device based on surface plasmons to shake things up in very small systems. In a manner analogous to the way a laser operates, the "spaser" (surface...
Monolithic Saturable Absorber Modulates Optical Signal
Mar 1, 2003 — Computers, cell phones and XBoxes are powered by the ability of electrons to control electrons. In the world of photonics, the challenge is to develop the ability of photons to control photons. Researchers at Tampere University of Technology in...
Simulation Tools Assess Laser Communications System Performance
Mar 1, 2003 — Bidirectional laser communications among ground and air- and spaceborne platforms holds promise of extremely high bandwidth data transfer in commercial and military applications. One challenge still to be met is optical-beam degradation from...
Fiber Bragg Gratings Filter WDM Signals
Mar 1, 2003 — Fiber Bragg gratings are versatile wavelength filters for multiplexing and demultiplexing wavelength division multiplexing (WDM) signals. They also can compensate for chromatic dispersion that can degrade the quality of the WDM signal in an optical...
Multiwavelength Lasers Simplify WDM Networks and Applications
Mar 1, 2003 — Mode-locked lasers are common tools for producing short pulses in the time domain, including telecommunications applications at multigigahertz repetition frequencies that require tunability in the C-band. Now they also can work as multiwavelength...
Making Machines See
Mar 1, 2003 — Today, machine vision is associated with industrial automation, where vision systems help with the manufacture and inspection of products. Innovations are making machine vision solutions smaller, more powerful, easier to use and less expensive....
Photonic Component Manufacturers Move Toward Automation
Mar 1, 2003 — Laser diodes are everywhere. But as the semiconductor laser has evolved to yield a family of robust, reliable devices, manufacturing these devices confronts the existence of multiple proprietary techniques as well as intellectual property...
Tracking Nanoposition Advances
Mar 1, 2003 — What works in the microworld very often doesn’t work in nanopositioning applications such as nano-imprinting, scanning microscopy, microlithography and automated alignment. End users will often need to rethink positioning strategies, including...
Hot Electron Transfer Solar Cells Show Promise
Mar 1, 2003 — Results of a study published in the Feb. 6 issue of Nature suggest the feasibility of photovoltaic cells based on a new device structure that captures energetic electrons generated by photon absorption in photoreceptive dyes and that transfers them...
Single-TEC Lasers Display Low Drift
Mar 1, 2003 — Japanese researchers at Yokohama R&D Laboratories in Kanagawa and Fitel Photonics Laboratories in Chiba report in an upcoming issue of IEEE Photonics Technology Letters highly stable laser modules that employ a single thermoelectric cooler...
Teleportation Opens Door to Repeaters
Mar 1, 2003 — A quantum teleportation experiment at Universität Wien in Vienna, Austria, has confirmed the feasibility of procedures that involve freely propagating qubits and quantum repeaters. The results of the study appear in the Feb. 13 issue of...
Lab Experiment Probes Photon Charge
Mar 1, 2003 — Researchers at Brookhaven National Laboratory in Upton, N.Y., have devised a new apparatus for measuring the upper limit on the charge of the photon. The approach, which was described in the Jan. 1 issue of Physical Review D, has yielded results an...
Dual-Wavelength Pumping Tested
Mar 1, 2003 — A team from Universidade Federal de Pernambuco in Recife, Brazil, CETUC-PUC Rio in Rio de Janeiro, Brazil, and Acreo AB in Stockholm, Sweden, presented its findings on a dual-wavelength pumping technique for Tm:fiber amplifiers in the February issue...
Nanoholes Improve Single-Molecule Analysis
Mar 1, 2003 — Researchers at Cornell University in Ithaca, N.Y., have developed a nanostructured sample holder that enables the analysis of single molecules at realistic concentrations. The device, which features arrays of tiny holes in a metal film, has...
Liquid Enables Tunable Microlenses
Mar 1, 2003 — Microlenses play an important role in numerous photonic applications, including imaging, optical data storage and telecommunications. A liquid device developed at Lucent Technologies Inc.'s Bell Lab in Murray Hill, N.J., promises the ability to...
Nanowires Form Electrically Driven Laser
Mar 1, 2003 — A team of scientists at Harvard University in Cambridge, Mass., has developed an electrically driven laser based on freestanding semiconductor nanowires. The laser is relatively inexpensive to produce and has the flexibility to be integrated with...
Fiber Laser Produces 4.1 kW
Mar 1, 2003 — Fiber lasers are becoming competitive with traditional flashlamp- or diode-pumped solid-state lasers in applications such as remote sensing, medical surgery and materials processing. Researchers at the University of Manchester in the UK have...
Doped Glass Enables Tiny Bar Codes
Mar 1, 2003 — The ability to label chemicals, biological samples, explosives and currency with invisible ID tags would lead to numerous security and safety applications. Now scientists at Corning Inc. in Corning, N.Y., have built bar codes from microscopic slices...
Optimal Pulse Control Deciphered
Mar 1, 2003 — Ultrafast laser pulses can control reactive pathways in chemicals. In a proposed strategy known as adaptive optimal laser pulse control, an algorithm iteratively determines the combination of laser parameters that will best be able to achieve the...
GaN-Free LEDs Offer UV Emission
Mar 1, 2003 — Researchers at NTT Basic Research Laboratories and NEL TechnoSupport, both in Atsugi, Japan, have obtained 350-nm emission from a GaN-free, AlGaN single-quantum-well LED. They presented their work in the Jan. 6 issue of Applied Physics...
Single-Active-Layer Organic LED Yields 16,000 cd/m2
Mar 1, 2003 — By incorporating a 6-nm-thick layer of Teflon, a single-active-layer organic LED fabricated at Tsinghua University in Beijing displays a brightness of 16,000 cd/m2 and a luminous efficiency of 0.85 lm/W. The university researchers suggest that the...
Integrating Cylinder Improves Smoke Detector
Mar 1, 2003 — At Gunma University in Kiryu, Japan, researchers have demonstrated that the use of an integrating cylinder as a light collector improves the sensitivity and linearity of optical smoke detectors. They reported their findings in the Jan. 1 issue of...
Laser Helps Produce and Power Microtools
Mar 1, 2003 — A team of scientists at Nagoya University in Japan has reported the fabrication of an optically driven microneedle and microtweezers that are suitable for use in aqueous environments. The team suggests that the microtools may find a place in such...
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August 2024
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