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Research & Technology News

Paper-Thin Displays Created
Jul 1, 2007 — A group at The Hong Kong University of Science and Technology has created flexible displays as thin as paper by embedding conductive wiring patterns into thermochromic composite films. The paperlike display fabricated with polydimethylsioxane-based thermochromic and silver nanoparticle composites provides ample flexibility. The finished display is lightweight and flexible enough that it can be wrapped around a column and still work, said lead researcher Weijia Wen. Potential...
Pushing for Change in Magnifying Lenses
Jul 1, 2007 — As scientists have realized for many years, the fluid nature and natural magnification of water could make it perfect for use in liquid lenses with an adjustable focal length. Yet prototypes developed using water and other liquids have enjoyed few...
Silicon Raman Laser Has Low Threshold, High Power
Jul 1, 2007 — In the past three years, several research groups have demonstrated Raman lasers in silicon. That is important because silicon is the basic building block of semiconductor electronics, and the integration of electronics and photonics would be greatly...
Studying a Splat in the Making
Jul 1, 2007 — The splat that droplets of plasma make when they strike a substrate is similar to the shape that pancake batter forms when it hits a hot griddle. In the past, scientists investigating plasmas have had only the splat to work with — a situation that...
Allan Kreutzer Joins EO as Global Sales VP
Jun 28, 2007 — Allan Kreutzer was recently named vice president of global sales at Edmund Optics, a Barrington, N.J.-based optics, imaging and photonics technology provider for research, electronics, semiconductor, pharmaceutical, biomedical and military markets....
Cavity-Dumped Laser with Pulses Adjustable from 170 to 900 ns
Jun 1, 2007 — High-power visible lasers with a high repetition rate are essential to many materials-processing applications. Scientists in Germany recently demonstrated a green thin-disk laser that generates up to 100 W of average power at frequencies as high as...
Compact Raman Laser Generates Eye-Safe, Nanosecond Pulses
Jun 1, 2007 — Eye-safe lasers, whose wavelengths are not transmitted through the human cornea and thus are incapable of damaging the retina, are required in many applications where accidental eye exposure is a possibility. Recently, researchers in China designed...
Edge-Emitting Photonic Crystal Nanolaser
Jun 1, 2007 — Tiny resonators and waveguides based on photonic crystals provide a promising approach to fabricating high-density photonic integrated circuits. Recently, collaborating scientists at the University of Southern California, Los Angeles, at the...
Fiber Polarizer for Telecom Application
Jun 1, 2007 — Polarizers often are required for fiber optic communications, but those fabricated in fibers usually have a self-defeating temperature dependence. Bulk optical polarizers, the alternative, are large and awkward to integrate into telecom systems,...
Going Negative in the Visible
Jun 1, 2007 — Negative refraction — the recently realized opposite of positive refraction — is of interest because, among other applications, it promises a superlens that can image far below the diffraction limit. To date, negative refraction has been...
Linking Perceived Surface Properties to Image Statistics
Jun 1, 2007 — Scientists have discovered a great deal about how the brain perceives objects. Less clear is how it identifies what these objects are made of based on their surface appearance. Understanding how humans make this determination would provide insights...
Natural Fiber Optic Plates
Jun 1, 2007 — A research team has discovered that cells in the retina of vertebrates function like fiber optic plates, yet the ways in which they differ from man-made materials could provide clues for building superior optical fibers and fiber optic plates. For...
Optical Techniques Reveal Clues about Ancient ‘Comb Jelly’ Embryos
Jun 1, 2007 — The Meishucun assemblage of fossils in southwestern Shaanxi, China, documents the beginnings of the Cambrian explosion of animals roughly 540 million years ago — a period in which the diversity of skeletonized metazoans (multicellular animals that...
Reflection of Multilayered Surfaces Measured
Jun 1, 2007 — Beetles’ rigid forewings, called elytra, often display multilayered structures and iridescent metallic colors. As one might imagine, their refractive index proves hard to measure accurately. To help address this challenge, Joseph A. Noyes and...
Short Laser Pulses Facilitate Hybrid CARS Technique
Jun 1, 2007 — Although not a widespread disease, anthrax remains a central concern for many microbiologists because of its potential use as a bioweapon. Conventional spectroscopic methods, such as infrared absorbance and Raman, as well as surface-enhanced Raman...
Ultrafast Laser Achieves Quill-like Writing
Jun 1, 2007 — Lasers have been used for years to inscribe words and other designs. But things are starting to get a little fancy. By using ultrashort light pulses on transparent materials such as silica glass, researchers have achieved a calligraphic style of...
Can Laser Propulsion Stabilize Satellites?
May 1, 2007 — Laser-propelled spacecraft have been around in science-fiction comic books for years, but now an independent scientist has seriously proposed laser propulsion as a technique to stabilize rock-solid formations of spacecraft, thereby providing...
Generating High Green Power Without the ‘Green Problem’
May 1, 2007 — Intracavity frequency-doubled neodymium lasers are attractive sources of green power, which is useful in many materials-processing applications and as a pump for other lasers. However, the so-called “green problem” often introduces deleterious...
High-Gain and Low-Power ZnO Nanowire Photodetectors
May 1, 2007 — Zinc oxide (ZnO) is frequently used as an alternative to GaN in optoelectronics because of its low cost, ease of manufacturing and wide bandgap. The proliferation of ZnO nanowire devices such as optically pumped lasers, chemical and biological...
Making Fiber Act like a Pockels Cell
May 1, 2007 — Researchers at Acreo AB in Stockholm, Sweden, have recently demonstrated an all-fiber device that, like a Pockels cell, rotates the polarization of light passing through it when a voltage is applied. Although the physics is completely different —...
Molecular Machine Opens and Closes in Response to Light
May 1, 2007 — Equipped with tools that can manipulate single molecules, researchers may be able to construct molecular robotic devices for numerous applications. Although a number of groups have produced tools with such potential, until recently none had...
Outputs of Fiber Lasers Combined Coherently
May 1, 2007 — The largest barrier to increasing the power from fiber lasers is the onset of nonlinear effects and optical damage that result from high power density in the fiber core. An obvious solution is to increase the core diameter, thereby reducing the...
Quasi-Phase Matching Effective in Microring Resonator
May 1, 2007 — Quasi-phase-matched second-harmonic generation in crystals has evolved into a successful technique of avoiding the beam walk-off and degradation of beam quality associated with angular phase matching. Moreover, quasi-phase matching provides a...
Raman Laser Provides Unique Ultraviolet Wavelengths
May 1, 2007 — Ultraviolet lasers have many important applications in biohazard detection and environmental sensing, yet very few stable and robust ultraviolet lasers exist. The third and fourth harmonics of neodymium lasers (355 and 266 nm) are fairly easy to...
Sheep Horns Reveal Diet
May 1, 2007 — Jörg Feldmann, a professor of analytical chemistry at the University of Aberdeen in the UK, could someday look at your fingernails in much the same way he has already examined the horns of seaweed-eating sheep. He and his colleagues at the...

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