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(9,094 items)
Research & Technology News
Assembly Technique Leads to Thermally
Responsive Microlens Arrays
Dec 1, 2006 — A team of researchers from China and Japan has developed a technique to assemble thermally responsive microlens arrays that is suitable for mass production. The one-step technique encapsulates poly-N-isopropylacrylamide (PNIPAAm) for fabrication of monodisperse microcapsules, whose size, embedding efficiency and wall thickness can be controlled. The microcapsules were hexagonally packed to form microlens arrays via a self-assembly process. Because of the thermal responsiveness of PNIPAAm,...
Bragg Gratings Enable Efficient Phosphate Glass Fiber Lasers
Dec 1, 2006 — Although silica glass is the material of choice for nearly all of today’s fiber lasers, the rare-earth doping level that can be achieved in silica glass is a significant limitation to its performance in lasers, especially in pulsed lasers. Fibers...
Generator Launches Selected Mode into Multimode Waveguide
Dec 1, 2006 — Although large amounts of “dark fiber” — that is, unused fiber cables laid across cities, nations and oceans — still exist in the world today, the demand for capacity is constantly increasing. To satisfy this demand, telecom scientists are searching...
Grating Restricts Fiber Laser to Four Closely Spaced Lines
Dec 1, 2006 — Wavelength-switchable fiber lasers are required for flexible dense-wavelength-division-multiplexing (DWDM) networks, as well as for many fiber optic sensing systems and for spectroscopic studies. Although researchers at several laboratories have...
Inclinometer Shows Versatility of Fiber Optic Sensors
Dec 1, 2006 — There are a multitude of techniques with which to measure temperature, strain, pressure and other parameters with fiber optic sensors. In yet another example of the versatility of optical fibers as measurement devices, a collaboration of scientists...
Light Alters Film’s Degree of Wetness
Dec 1, 2006 — Researchers at Pohang University of Science and Technology in South Korea have developed a film that can become wet or dry upon exposure to different wavelengths of light. Eventually, it could serve as a biosensor, a microfluidic device or an...
Lighting the World with a Smile
Dec 1, 2006 — According to researchers in Germany, teeth may provide more than just a smile that helps gain friends and influence enemies. Instead, the structure of these dental fixtures could lead to the development of solar collectors that function under...
Noninvasive Time-Lapse Fluorescence Imaging Captures Colloid Transport
Dec 1, 2006 — Colloidal suspensions consist of nanometer- to micron-size particles dispersed in liquid or gas. Examples include smoke, milk and ink as well as living cells in biological fluids. In everyday environments, colloidal suspensions typically are not...
Output Beam from Fiber Laser Is Radially Polarized
Dec 1, 2006 — A radially polarized laser beam, in which the electrical field is always along a line from the center, like the hands on a clock, is useful in particle trapping and acceleration, as well as in high-resolution microscopy. Researchers have previously...
Photonic Crystal Fiber Proposed for Telecom Dispersion Compensation
Dec 1, 2006 — One strength of photonic crystal fiber is its flexibility to be designed with desirable optical characteristics. A photonic crystal fiber’s dispersion, in particular, can be adjusted by modifying its geometrical design; therefore, the fibers seem to...
Sending Secrets Securely
Dec 1, 2006 — If you want to tell a secret, it is best to whisper. However, your secret is safer when people nearby are talking loudly. That is the basis for a secure communication technique developed by Bernard B. Wu and Evgenii E. Narimanov, both of Princeton...
Structural and Photonic Properties of Butterfly Wings Replicated
Dec 1, 2006 — The wings of the Morpho Peleides butterfly may not affect weather patterns across the world, but researchers from Georgia Institute of Technology in Atlanta and Zhejiang University in Hangzhou, China, have discovered that they may influence the...
Germany, Korea Partner for Optoelectronics Research Training
Nov 3, 2006 — The Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) and the Korea Science and Engineering Foundation (KOSEF) announced yesterday the opening of the International Research Training Group "Self-Organized Materials for...
A Flexible Display with the Blues
Nov 1, 2006 — A group of researchers at the University of Central Florida in Orlando is not feeling blue, even though its displays are. By inducing a controllable blueshift in a thin film, it successfully fabricated a flexible display that can be wrapped around a...
All-Fiber Michelson Interferometer Proposed as Unique Sensor
Nov 1, 2006 — Researchers at Harbin Engineering University in China have demonstrated an all-fiber Michelson interferometer that they suggest could be used as a displacement sensor, an accelerometer or a flow-velocity sensor. Unlike many other fiber optic...
All-Nanoparticle Coatings Increase Clarity
Nov 1, 2006 — Nanoparticle coatings with antireflective, antifogging and self-cleaning properties have been prepared by a team of researchers from MIT in Cambridge, Mass. Using an aqueous-based layer-by-layer deposition technique, the scientists created thin...
Better Switches for Planes
Nov 1, 2006 — Standard electrical wiring in aircraft is bulky, is heavy and can lead to fires. But now, researchers at Texas A&M University in College Station say that switches that once operated electrically may be replaced with those that work...
Building a Better Guide Star, Times Five
Nov 1, 2006 — The nursery rhyme is half correct: Stars are not little, but they do twinkle — thanks to fluctuations in the atmosphere. Consequently, when astronomers peer upward, they get a less-than-perfect image of stars and planets. So they have turned to...
Diode Laser Emits at 2 μm, Tunable Across 177 nm
Nov 1, 2006 — Tunable lasers that emit in the 2- to 3-μm spectral region have many applications in molecular spectroscopy, military countermeasures, and medical diagnostics and therapy. With an eye toward medical diagnostics — noninvasive blood glucose...
Evanescent Coupling Lights up a Fiber
Nov 1, 2006 — A fundamental problem of modern photonics is transferring light efficiently between the optical fibers that transport light and the semiconductor devices that generate, control and detect it. One promising, albeit nascent, approach is to grow the...
Femtosecond Laser Quadruples Its Output
Nov 1, 2006 — As the energy available from femtosecond disk lasers creeps above a microjoule, the devices become interesting for use in several applications, not the least of which is three-color laser projection. The high peak power available from these lasers...
Interrogating Fiber Optic Sensors on the Cheap
Nov 1, 2006 — Because fiber optic sensors are lightweight, compact and immune to electromagnetic interference, they have found numerous applications in monitoring industrial processes and mechanical structures. But reading the sensors’ data requires precision...
Microring Resonators Make Efficient Add/Drop Multiplexers for WDM
Nov 1, 2006 — A successful strategy since the first cavemen earned their tribe’s dinner by separating a single woolly mammoth from the herd has been “divide and conquer.” In modern times, it has morphed into a technique to design algorithms for solving complex...
Nd:GdVO4 Laser Generates Deep-Blue Light at 440 nm
Nov 1, 2006 — Many “quasi three level” neodymium lasers, in which the lasing transition terminates on an upper sublevel of the ground state, have been operated in the past 40 years. But researchers at Centre Scientifique d’Orsay in France have demonstrated what...
New Fiber Amplifier Provides Broadband Gain in the O-Band
Nov 1, 2006 — The C-band, between 1530 and 1565 nm, has been the spectral region of choice for dense wavelength division multiplexing telecommunications during the past decade because erbium-doped fiber amplifiers (EDFAs) provide efficient broadband gain in that...
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