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Industrial Features
Want a White Light? Print It.
It someday may be possible to produce white organic LEDs via printing, courtesy of researchers from the University of Michigan in Ann Arbor who have described using organic vapor jet printing to directly pattern devices on a substrate. The technique combines three individually controllable color components into a white-light device. The method offers the potential for high manufacturing throughput at a low cost, important attributes for a commodity such as a light source, observed research...
Photonics Spectra, April 2008
Watching What Happens During Attoseconds in Solids
New insight into ever-smaller structures of matter and their ever-faster dynamics holds great promise for pushing the frontiers of many fields in science and technology. The speed of electronic processes is determined by the separation of the...
Photonics Spectra, April 2008
Detecting Biofouling in Food Processing Systems
Biofilms typically are bacterial and/or fungal organisms that colonize in slime films on the inside surfaces of pipes, vessels and equipment that handle and process liquids. They result from biological fouling, or biofouling for short, and can be...
Photonics Spectra, March 2008
Fiber Pulling Profits from Precise Positioning
The advent of tunable narrowband lasers in the 1970s gave scientists a powerful tool to control and probe atoms and molecules, opening the door to an exciting world of quantum physics. When atoms and molecules are exposed to the intense...
Photonics Spectra, March 2008
Incoherent Detection of Airborne Pollutants
Researchers and regulators have a new tool when it comes to detecting airborne pollutants and pinpointing their source, thanks to a group from University College Cork in Ireland. The group’s members have demonstrated an incoherent broadband...
Photonics Spectra, March 2008
Measuring Food Packaging Materials
Packaging is an important aspect of the food industry, especially for frozen items. Packaging that is too thin or that is not made of the right materials could lead to “freezer burn”; on the other hand, overprotecting food leads to unnecessary...
Photonics Spectra, March 2008
Nanoparticle Plasmons Used to Enhance Solar Absorption
Researchers seeking to improve solar absorption for the next generation of photovoltaic technology are exploring whether surface plasmon resonances of gold nanoparticles can augment the conversion of photons into usable energy. Although similar...
Photonics Spectra, March 2008
Optical Filters Go Deeper
The importance of optical applications in the middle-ultraviolet spectral region — between about 200 and 320 nm — continues to increase with the advent of new excitation light sources in this range, also identified as the UVC (200 to 280 nm) and UVB...
Photonics Spectra, March 2008
Saving Money with Laser Processing
Flat panel displays are one of the great modern engineering success stories. They are everywhere — in mobile phones, public displays and even sports arenas. In fact, even now there is a fair chance that you use them every day at home, at work or...
Photonics Spectra, March 2008
Slicing and Dicing Food and Agricultural Data
Farming has gone high-tech, with optical monitoring taking place from the air and from satellites, on planting and harvesting equipment, and on ground-based sensors. The food and beverage industry uses optical sensing to ensure that raw materials,...
Photonics Spectra, March 2008
VGA Imagers in Camera Phones
Early cell phones had very low resolution imagers, typically 0.1 megapixels. This resulted in barely acceptable picture quality. Consequently, the imager resolution moved quickly from the common intermediate format to video graphics array (VGA),...
Photonics Spectra, March 2008
What’s Next for Solid-State Lasers?
Advanced Solid-State Photonics (ASSP) 2008 was held Jan. 27 to 30 in the Noh Theatre of the Nara Prefectural New Public Hall in Japan. It was the first time the conference had been held in Japan, and it produced a host of intriguing papers on topics...
Photonics Spectra, March 2008
A Preference for High-Power Polarizers
As laser energies have increased throughout the years, the selection of appropriate polarization components has become more limited. Until recently, if a system was running greater than about 1 J/cm2, the only options were air-spaced beamsplitter...
Photonics Spectra, February 2008
High-Refractive-Index Encapsulants for High-Brightness LEDs
High-brightness LEDs have developed rapidly during the past five years. They are used in traffic lights, signs and specialty lighting and in new applications such as backlight units for LCDs, headlamps for cars and street lighting. The efficiencies...
Photonics Spectra, February 2008
Improving the Profitability of LEDs
LEDs have proliferated as a result of increased mobile phone sales, but pricing pressure has held revenue growth at only about 8 percent over the past two years, according to a recent report, “LED Manufacturing Technologies,” by Yole Développement...
Photonics Spectra, February 2008
Thin-Film-Coating Nuances of UV Optics
Over the past decade, thin-film coating technology and designs have improved significantly, resulting in lower-loss filters and in mirrors that are more spectrally accurate and that perform better under a variety of operational environments. In the...
Photonics Spectra, February 2008
Bragg Grating Waveguides: Extending Bragg Technology into Three Dimensions
Conventional optical waveguides are transparent structures, providing a refractive index contrast that guides optical fields via total internal reflection. Optical fiber is the best-known example, delivering light signals around the world while...
Photonics Spectra, January 2008
Fabricating Flat Panel Displays with Lasers
Flat panel displays are sophisticated devices and require sophisticated manufacturing techniques. More and more, lasers are becoming an integral part of the manufacturing process for flat panel displays and other microelectronics because lasers can...
Photonics Spectra, January 2008
Laser Dicing Technique Cuts Wafers from the Inside Out
Wafer fabs continually face challenges in manufacturing semiconductor devices because the devices continue to get tinier and more complicated. Integrated circuits continue to increase in circuit density. Trends in chip design and materials, such as...
Photonics Spectra, January 2008
Machine Vision Adapts to Harsh Environments
Exploding beer bottles, tsunamis and flour may not seem to have anything in common, but they are all hazards that machine vision systems can face in field applications. System designs targeting the controlled conditions of a lab expect an ideal...
Photonics Spectra, January 2008
Nanoscale Light Sources Could Benefit Near-Field Scanning Optical Microscopy
The probe tip traditionally used with near-field scanning optical microscopes comprises an optically pumped device that transmits light from a far-field source to the sample through either a hollow pyramid or an optical fiber, possibly leading to...
Photonics Spectra, January 2008
Artificial 3-D Quantum Dot Crystal Created
Although quantum dots are being looked at for a growing number of applications, the scale of the nanosize semiconductors continues to make it difficult to arrange them into the precision patterns necessary for applications such as optoelectronics,...
Photonics Spectra, December 2007
Closing in on Photonics Large-Scale Integration
The introduction of very large scale integration dramatically cut the cost of electronic devices, driving the development of a wide range of new products. Efforts to bring the benefits of large-scale integration to the photonics sector have proved...
Photonics Spectra, December 2007
Opening Optical Fibers Without Sacrificing Robustness
Access to the core of an optical fiber is required for many applications, including evanescent wave sensing. Direct access to the core of conventional optical fibers has been achieved typically by removing the fiber cladding by etching or by...
Photonics Spectra, December 2007
Organic Thin-Film Solar Cell Research at Stanford University
Although extremely simple in concept, successful photovoltaic devices for solar energy production will require the optimization of many different parameters involving material electron donor properties, electrode configurations, substrate mechanics...
Photonics Spectra, December 2007
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