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Feedback-Based Imaging Enables Miniature Scanning Confocal Microscopes
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 Besançon, France, have demonstrated a detection scheme that relies on optical feedback in a vertical-cavity surface-emitting laser (VCSEL). Although the approach ultimately may not be as sensitive as other laser-based methods that monitor optical power...
Photonics Spectra, July 2006
Fourier Transform Infrared Spectroscopy Exposes Self-Assembly
of Mesoporous Thin Films
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...
Photonics Spectra, July 2006
How Much Energy Are You Throwing Away?
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...
Photonics Spectra, July 2006
LED Lighting Gaining in Cost-Effectiveness
A number of developments are converging to stimulate widespread replacement of traditional incandescent and fluorescent bulbs with LEDs in many general illumination applications. Some call it a revolution in lighting technology. Although several...
Photonics Spectra, July 2006
Measuring 3-D Semiconductor Packaging
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...
Photonics Spectra, July 2006
Microscopy Probes Dielectric Constant of Nanostructured Films
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...
Photonics Spectra, July 2006
Nanotube Sheet Employed as OLED Electrode
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...
Photonics Spectra, July 2006
Outlook Brightens for LEDs in the Lighting Market
As the LED comes closer to becoming tomorrow’s general lighting source, several factors will determine its rate of adoption in the market. Predicting that rate is complex because LEDs are not a one-to-one replacement for current light sources. Not...
Photonics Spectra, July 2006
PCI Motion Control in Microscope Automation
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...
Photonics Spectra, July 2006
Phosphor Placement in White LED Packages
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...
Photonics Spectra, July 2006
Photonic Crystal Improves Output of Quantum Dot Films
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...
Photonics Spectra, July 2006
Polymer OLEDs Match Small-Molecule Efficiencies
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...
Photonics Spectra, July 2006
Subdiffraction-Limit Microscopy Exposes Vesicle Dynamics
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...
Photonics Spectra, July 2006
The Transistor Laser: A Natural for Optoelectronic Integrated Circuits
Since it was first demonstrated by John Bardeen and Walter H. Brattain in 1947, the transistor has spawned a $300 billion semiconductor industry and has made possible our digital way of life, enabling computers, cell phones, MP3 players and the...
Photonics Spectra, July 2006
Time-Resolved Near-IR Spectroscopy Probes Potential Jump at Electrochemical Interface
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...
Photonics Spectra, July 2006
A New Look at Risley Prisms
With more and more applications requiring laser beams to be aimed at distant targets, such as for line-of-sight communications, aircraft-to-satellite secure communications, and laser weapons and countermeasures, there are increasing demands for...
Photonics Spectra, June 2006
Channeling Surface Plasmons
Modern communications systems must deal with huge amounts of data at ever-increasing speeds. In doing so, they try to use the best features of electronic and optical circuits. Electronic circuits are tiny, but their operation speed is limited....
Photonics Spectra, June 2006
Dots Within Dots May Hit the Spot
Like nested dolls, quantum dots can reside inside microspheres. Quantum dots are a few nanometers in diameter and have bright, size-dependent emission. A single wavelength can be used to excite dots of different sizes, making multiplexing possible....
Photonics Spectra, June 2006
Fluorescent/Phosphorescent White Organic LEDs Employ Singlets and Triplets
In their continuing pursuit of a replacement for the incandescent light bulb, researchers at Princeton University in New Jersey and at the University of Southern California in Los Angeles, with the support of Universal Display Corp. of Ewing, N.J.,...
Photonics Spectra, June 2006
Frequency Comb Improves Cavity Ringdown Spectroscopy
Spectral discrimination reveals band structures to identify analytes, but accessing spectral information has been challenging, as spectroscopists have been forced to balance the parameters of spectral range, sensitivity, resolution and acquisition...
Photonics Spectra, June 2006
FTIR Spectroscopy Measures Sugars in Apples
One quantitative measure of the quality of fruit that can be employed to determine the optimum harvest time, to validate storage methods and to monitor processing is the relative amount of glucose, fructose and sucrose. High performance liquid...
Photonics Spectra, June 2006
GaN LEDs Incorporate Laser Liftoff and Photonic Crystal
The material of choice for solid-state lighting solutions from the ultraviolet to the blue-green region of the spectrum has been GaN. As with all LED materials, however, the relatively high refractive index of GaN tends to result in the trapping of...
Photonics Spectra, June 2006
In Situ Process Promises Mass Production of Nanowire-Based Photodetectors
A fundamental hurdle in the race to develop viable optoelectronic devices based on nanoscale structures is finding an easy way to place those structures as desired and to connect them with much larger components. Now John T.L. Thong and Jaslyn B.K....
Photonics Spectra, June 2006
Innovative Technology Enables a New Architecture for the World’s Largest Laser
The world’s largest laser, the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory in Livermore, Calif., is 85 percent complete (Figure 1). When operational, its 192 ultraviolet beams will converge on a target filled with...
Photonics Spectra, June 2006
IR Spectroscopy Maps Linker Films
In fields as diverse as genomics and defense, surfaces must be scanned for traces of chemicals and other substances. The use of self-assembled monolayers is an effective method of modifying the properties of these surfaces, acting as linker films...
Photonics Spectra, June 2006
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