Photonics & laser

Photonics & laser colaterale (4458)
Photonics & laser generale (2343)
Photonics & laser tendinte (84)

Synopsis: Domenii: Photonics & laser:

and a light comes on you freak out and pull over. You can then load up that scenario, based on the symbols,

It could then tell the driver that, for example, it the low coolant light, and to open the engine compartment to check the level while giving instructions at every step.

In light of this, calls are growing from many on the continent#and even the African Union#for the formation of Afrispace, a pan-African space agency.

To try to shed some light on the matter, the Argonne researchers have turned to a smaller version of the Large hadron collider to see

Injector gadget This process allows the flow of droplets of fuel to be imaged in a way that is not possible with ordinary light or lasers, for example.

Using visible light presents challenges similar to those of using car headlights in fog which consists of droplets of water suspended in the air,

and the light just reflects back into your eyes, "says Powell.""You turn on the high beams to try to make it even brighter,

Visible light can highlight the outline of fuel spray but not any internal detail. X-rays, on the other hand, can pass through the relatively large droplets of fuel

because their wavelength is much shorter than that of visible light. On a much smaller scale, some of the X-rays are absorbed by the atoms that make up the drops,

Certainly, manufacturers have been trying to allay the fears of nervous drivers with blinking battery lights by investing in faster charging stations at more convenient locations.#

The basic concept is to equip drug molecules with chemical components that change shape in response to heat or light.

Organic chemist Ben Feringa at Groningen and his co-workers used an existing light-switchable unit called azobenzene,

If the Z-shaped isomer absorbs ultraviolet light, it will become switch to the C-shaped isomer.

The reverse shape change can be induced by visible light or gentle heating at around body temperature. Feringa and colleagues substituted the azobenzene switch for a similar chemical grouping within several variants of an antibacterial molecule called a quinolone,

Or at least they were after exposure to ultraviolet light made them switch to the C-isomer.

and then turned on with light once they reach the part of the body (the throat or lungs, say) where the harmful bacteria are lurking.

Switching on drugs with ultraviolet light is not ideal in practice because it can have harmful effects.

Feringa says he is now working on developing molecules than can be shifted shape with visible light, or better still infrared,

"It's like trying to see the light from a feeble little LED 10cm away from a stadium floodlight,

they would be receiving light from Earth from today. To them, Armazones would still look intact.

"By far the most powerful combination right now is the combination of transit detections and Doppler spectroscopy,

and do the spectroscopy, #says Macintosh.""And if Tess finds a habitable planet around a very nearby star,

if you could draw energy from almost unlimited sources found in nature#water and light.

Acceleration should be respectable at 0-60mph (0-100kph) in less than 6 seconds#more than enough to beat most cars away from the lights."

The team most important discovery sheds light on what causes the TRN-thalamus-cortex circuit to perform abnormally.

delivering 10 to 100 times faster 3d imaging speeds than laser scanning confocal, two-photon,

Her study is published in the Advance Online Publication (AOP) on Nature Photonics's website on January 19, 2015."

While conventional light-sheet microscopes use two awkwardly positioned objective lenses, Hillman realized that she could use a single-objective lens,

Her job shedding light on her husband's triumph and business. ANN ROMNEY WIFE OF MITT ROMNEY:

the scientists used a technique called laser capture microdissection that was effective in removing individual cells from the chip without damaging them,

Tseng said it is conceivable that the new system will replace laser capture microdissection as the standard protocol. ith our new system,

Marginprobe utilizes non-destructive radio-frequency spectroscopy technology in the operating room to analyze the outer margins of removed cancerous tissue to detect traces of cancer cells.

a miniature dovetail stage and a laser diode that excites the fluorescently labeled DNA molecules"for the demonstration.

Interfaith Power & Light will be using Mosaic Places to build campaigns around places of worship going solar.

and artificial light conditions and even shaded areas. Solarwindow#uses organic materials, which are dissolved into liquid, ideal for low-cost high-output manufacturing.

Solarwindow#also generates electricity from both natural and artificial light sources such as fluorescent light emitting diodes (LED),

and incandescent lights in offices; conventional systems become less efficient under these conditions, and again, may not work at all.

*See-through, with high level of#visible light transmission#;*#*Offers popular color choices while maintaining see-through qualities;*

*Capable of producing power in direct sunlight and shaded or low natural light conditions;**Able to generate significant electricity from both natural and artificial light;*

*Does not require expensive high-temperature or high-vacuum production techniques inherent to conventional solar;**Constructed using organic materials (polymers),

and artificial light conditions and even shaded areas. Solarwindow#uses organic materials, which are dissolved into liquid, ideal for low-cost high-output manufacturing.

A light on the instrument panel indicates when CNG is being used and there is no interruption in the vehicle performance.

The device uses a thumbnail-sized quantum cascade laser (QCL) as well as tuning forks that cost no more than a dime to detect very small amounts of nitrous oxide and methane.

That allows for far better detection of gases than more common lasers that operate in the near-infrared.

The technique called uartz-enhanced photoacoustic absorption spectroscopy (QEPAS invented at Rice university in 2002 by engineer Frank Tittel, Professor Robert Curl,

and is far better able to detect trace amounts of gas than lasers used in the past.

The laser beam is focused between the two prongs of the quartz tuning fork. When light at a specific wavelength is absorbed by the gas of interest

localized heating of the molecules leads to a temperature and pressure increase in the gas. f the incident light intensity is modulated,

then the temperature and pressure will be as well, Ren says. his generates an acoustic wave with the same frequency as the light modulation,

but they say theye made a breakthrough that could take thermophotovoltaics far beyond where it gone before. mit thermophotovoltaics MIT nanophotonic solar thermophotovoltaic device, with an array of multialled carbon nanotubes as the absorber, a oneimensional silicon/silicon dioxide photonic crystal as the emitter

T) he team inserted a two-layer absorber-emitter device made of novel materials including carbon nanotubes and photonic crystals between the sunlight and the PV cell.

it emits light of a particular wavelength, which in this case is tuned to match the bandgap of the PV cell mounted nearby.

This layer is bonded tightly to a layer of a photonic crystal, which is engineered precisely so that when it is heated by the attached layer of nanotubes,

It then builds the new part by laser sintering a process in which lasers are guided by an image to add layers of powdered material on top of each other where needed until the exact shape required is achieved.

Efficiency by design The new technology reduces waiting times and post-surgery complications, saving on care costs and helping patients resume their normal lives more quickly.

#Developing high-efficiency lasers to manufacture solar panels As the world continues its efforts to combat climate change

The aim of the European union (EU)- funded ALPINE project was to develop new laser techniques which would enhance the manufacturing of solar energy panels,

The project could have multiple benefits not only boosting Europe leadership position in lasers and in the photovoltaic (PV) industry,

and producing lasers and it is important to build on that, says Professor Stefano Selleri of Università degli Studi di Parma in Italy,

Just consider the fact that the laser and fibre laser market has remained completely unaffected by a global economic crisis

which left very few other sectors undamaged. Solar panels are able to function because they have intricate patterns of tiny channels engraved into their surface,

using a sharp stylus. The primary focus of the ALPINE project was to pioneer the use of new fibre laser technology to do this engraving

The use of lasers makes the process much quicker, enabling scribing speeds of metres per second way beyond the capability of mechanical scribing.

the ALPINE scientists investigated the potential of a new type of laser. Compared with existing lasers,

photonic crystal fibre (PCF) lasers offer better and more accurate beam quality, are highly efficient, use less power,

and generate less heat. This novel laser system was given especially important the requirement for the scribing process to work with the new,

high-tech materials now being developed for solar panels. In place of conventional solar panels measuring up to 5 millimetres in thickness,

PCF lasers provide this accuracy. Moreover, since PCF lasers operate with ultra-short pulse rates,

they remain cooler than traditional lasers and avoid causing any heat damage to the film.

The new materials provide several advantages, whether the panels are deployed terrestrially or in space. Their significantly reduced weight is one clear benefit.

The results of the ALPINE team work, demonstrating the capability of PCF lasers to transform existing scribing technology and opening the way to rapid growth in the high-volume production of flexible,

to be replaced by laser scribing. This will not only increase the processing speed, but it will also reduce the cost of ownership of the new technology because of its low maintenance and its cost-efficiency.

which found a way to detect asbestos fibres through a new light scattering technique. At the time, the project stalled as it was seen as too costly,

However, products in these sectors such as innovative display solutions and light emitting panels require the integration of different functionalities and demand new mass manufacturing methods and technologies.

Light-Rolls is researching the development of a production platform for the seamless and mass manufacture of these micro-products.

says Light-Rolls project representative David Gonzalez of PRODINTEC. ight-Rolls offers innovative production solutions that produce better

With its micro-product production platform, it is predicted that Light-Rolls will bring high-tech jobs to Europe. chieving success in the project will enable Europe to say ahead of the game in micro-manufacturing.

While working at The netherlands Centre for Laser Research in 2000 he received Marie Curie funding to support two research fellows.

But modern life demands materials that are also light, ductile and eco-friendly. Now, thanks to two pioneering European union (EU) projects,

Laser marking might be the answerbut existing techniques produce microscopiccracks in the glass. It was to find a solution to this problem that the EU-funded SFERA project was set upusing funding from a programme designed tostimulate innovation by fostering cooperationbetween small and medium sized businessesaround Europe.

The result of the two-year 1. 5 millionproject was a unique new laser engravingtechnique known as'Naginels'.

In a sector where aesthetics arecrucial the laser engraving is almost invisible. More than that it can even be used to produceattractive light diffraction effects taht actuallyenhance the product a real win-win situation.

Back with the pharmaceuticals industry thenew system guards against another majorrisk: the danger of bottles getting mixed upduring production.

and laser and fluid polishing. he software Delcam developed under COMET is already generating up to a million euros in additional sales,

But the real significance of the regulatory green light, given by the UK's licensing body,

in cooperation with Thales Research and Technology in the United kingdom, say the tuneable laser source integrated on silicon is a groundbreaking achievement in efforts to secure fully integrated transceivers.

The group from CEA-Leti and III-V lab also demonstrated single wavelength tuneable lasers with a 21 ma threshold at 20o Celsius, a 45 nm tuning range and a side mode suppression ratio larger than 40 db over the tuning range.

The researchers say silicon photonics is a powerful technology. Silicon photonics have the potential to bring the large-scale manufacturing of CMOS to photonic devices that are not cheap

because the technology is missing. Another challenge to silicon photonics is the lack of optical sources on silicon, the base material on CMOSS, according to the researchers.'

'We can overcome this problem by bonding III-V material, necessary for active light sources, onto a silicon wafer and then coprocessing the two,

thus accomplishing two things at once, 'says Martin Zirngibl, Bell labs Physical Technologies Research leader.''Traditional CMOS processing is used still in the process,

while at the same time we now can integrate active light sources directly onto silicon.''Commenting on the results, CEA-Leti France Photonics Program Manager,

Laurent Fulbert, says:''We are proud to jointly present with III-V lab the results of the integrated silicon photonics transmitter and the tuneable laser.

The ability to integrate a tuneable laser, a modulator and passive waveguides on silicon paves the way of further developments on integrated transceivers that can address several application needs in metropolitan and access networks, servers, data centres,

high-performance computers as well as optical interconnects at rack-level and board-level. We are pleased to bring our contribution to these state-of-the-art results

#Euro-Indo collaboration develops new photodetector Photodetectors that analyse scattered light in the ultraviolet (UV) range of the spectrum are used often in situations where the rapid detection of hazardous biological

this can be shown, for example, by laser excitation. To this end, photodetectors with an extremely narrow bandwidth are required,

which only respond to particular wavelengths. Enter European and Indian scientists, who teamed up to offer the world an innovative solution.

Their work was published in the journal Applied Physics Letters in February 2007. An international consortium of scientists,

This means its bandwidth is five times narrower than that of a comparable photodetector. The device is also sensitive to polarised light,

which helps to reduce the scattered background radiation. Prof. Dr Holger T. Grahn from the PDI headed the team of researchers,

while the photodetector was produced at the Universidad Polotécnica de Madrid in Madrid, Spain by Carlos Rivera, Jose Luis Pau and Eliaz Munoz.

These agents are excited by a laser beam in order to produce fluorescence in the UV range of the spectrum.

The detector is used then to extract the optical fingerprint from the scattered light. A large number of photodetectors, with very narrow bandwidths, is necessary so as to simultaneously detect as many different substances as possible.

This requires each device being sensitive to a particular wavelength. The photodetector developed by the international consortium is merely the size of a pin head

and detects UV radiation of only 360 nm n

#Biofuels to be processed by oil refineries EU research seeks to run yesterday's refineries on next-gen fuels.

Luigi Chiesabio-mass processing is highly innovative resulting in the production of energy and oxygenated chemicals.

using concentrated light as a high-temperature energy source. The project is still at the experimental stage,

The process In a first step concentrated light-simulating sunlight-was used to convert carbon dioxide and water to synthesis gas (syngas) in a high-temperature solar reactor containing metal-oxide based materials developed at ETH Zürich.

Military clearance is required now before the green light is given to export the printer to the United states,

and scared when the lights go down.""Developers admit that the robot may make mistakes, but says Pepper will learn

a protective cover that pulls double duty as a calibration mechanism and a new light indicator on the activation button to let you know a scan is underway. ou don have to be a scientist,

Using a standard laser printer stocked with special wax-based inks he printed patterns of small dots onto uncoated filter paper.

The researchers believe that the protein has these properties because of its extremely compact three-dimensional structure as NMR spectroscopy has shown.

#Laser probe knows if you ate your veggies Yale university rightoriginal Studyposted by Michael Greenwood-Yale on November 6 2014a diet full of fruits

which uses blue laser light to quickly and painlessly scan the skin of a subject s palm accurately measures changes in a biomarker known as skin carotenoids in response to an intervention involving a diet enriched in fruits and vegetables.

The palm-reading device which uses resonance Raman spectroscopy (RRS) has the potential to help nutritionists

##The RRS device works by measuring changes in energy levels of electrons in molecules after the laser has excited them.

while the light interacts with carotenoids in the skin. Then software on an attached laptop processes the results

##The shoebox-sized prototype diagnostic device known as the single particle interferometric reflectance imaging sensor (SP-IRIS) detects pathogens by shining light from multicolor LED sources on viral nanoparticles bound to the sensor surface by a coating

Interference of light reflected from the surface is modified by the presence of the particles producing a distinct signal that reveals the size and shape of each particle.

In collaboration with BD Technologies and Nexgen Arrays a start-up based at the Photonics Center and run by longtime SP-IRIS developers David Freedman

These findings shed greater light on how the human immune response is regulated and for dengue how the virus has managed to evade these defenses.

They also sampled surfaces in the house including doorknobs light switches floors and countertops. Then the samples came to Argonne where researchers performed DNA analyses to characterize the different species of microbes in each sample.

Hemoglobinâ##a component of bloodâ###absorbs##more of the green spectrum of light and this subtle change can be detected by the camera s sensor.

Essentially the irregular electrical activity of the heart found in people with atrial fibrillation could be identified by##observing##the pulses of blood flowing through the veins on the face as it absorbed or reflected green light with each heartbeat.

##The results don t necessarily give people the green light to binge on butter. While the low-carb dieters got 41 percent of their calories from fat most were healthy monounsaturated and polyunsaturated fats like olive or canola oil.

#See into living brain with lasers and nanotubes By injecting carbon nanotubes into the bloodstream, scientists can use near-infrared lasers to see blood flow in a living animal brain.

The new technique, which is almost completely noninvasive, was developed for mice, but could offer insight into human ailments, such as strokes, migraines,

The researchers then shine a near-infrared laser over the rodent skull. The light causes the specially designed nanotubes to fluoresce at wavelengths of 1, 300-1, 400 nanometers;

this range represents a sweet spot for optimal penetration with very little light scattering. The fluorescing nanotubes can then be detected to visualize the blood vesselsstructure.

Amazingly, the technique allows scientists to view about three millimeters underneath the scalp and is fine enough to visualize blood coursing through single capillaries only a few microns across,

Furthermore, it does not appear to have any adverse affect on innate brain functions. he NIR-IIA light can pass through intact scalp skin

The technique, reported in Nature Photonics, could eventually be used in human clinical trials, Hong says,

but they also prevent light from passing through the cells. o, if we need to see individual cells within a large volume of tissue?

The technique is based on Fourier transform infrared spectroscopy, which provides information on how molecules vibrate.

or other colors in response to particular wavelengths of light. This is what produces the colorful cellular images that are so common in biology research.

since no fat remains to block the light. But here the hitch. Those probes stop working,

after theye been exposed to too much light. That fine if a scientist is just taking a picture of a small cellular structure

the whole tissue is bathed in light throughout the time it takes to image it point by point.

Because terahertz waves are much smaller in energy than visible light finding materials that absorb and turn them into useful electronic signals has been a challenge Kono says.

Carbon nanotube thin films are extremely good absorbers of electromagnetic light he explains. In the terahertz range the film a mix of metallic

With optogenetic tools that allowed the team to tune the firing frequency of these Chat+neurons up and down with laser light,

Better image quality For the current study, published online in Nature Photonics, the researchers validated the performance of DOT by comparing its results to fmri scans.

During DOT scans, the subject wears a cap composed of many light sources and sensors connected to cables.

The prototype circulator is 2 centimeters in size#more than 75 times smaller than the wavelength of operation.

The researchers believe that the protein has these properties because of its extremely compact three-dimensional structure as NMR spectroscopy has shown.

#Laser probe knows if you ate your veggies Yale university rightoriginal Studyposted by Michael Greenwood-Yale on November 6 2014a diet full of fruits

which uses blue laser light to quickly and painlessly scan the skin of a subject s palm accurately measures changes in a biomarker known as skin carotenoids in response to an intervention involving a diet enriched in fruits and vegetables.

The palm-reading device which uses resonance Raman spectroscopy (RRS) has the potential to help nutritionists

by measuring changes in energy levels of electrons in molecules after the laser has excited them.

while the light interacts with carotenoids in the skin. Then software on an attached laptop processes the results

For instance colloidal dispersions comprise such everyday items as paint milk gelatin glass and porcelain and for advanced engineering such as steering light in photonics.

#How energy loss can make lasers more intense Washington University in St louis rightoriginal Studyposted by Tony Fitzpatrick-WUSTL on October 20 2014energy loss in optical systems such as lasers is a chief hindrance

and efficiency and it occurs on an ongoing frustrating basis. To help laser systems overcome loss operators often pump the system with an overabundance of photons

or light packets to achieve optical gain. his turns the conventional textbook understanding of lasers upside down. ut now scientists have demonstrated a more effective#yet counterintuitive#way to reap energy gains:

they add loss to the laser system. In other words they ve invented a way to win by losing. oo much of something can be really detrimentalsays Sahin Kaya Ozdemir a research scientist at Washington University in St louis. f you pump in more energy to get more laser intensity

and it s too strong you can get a sudden drop in the laser performance. t is counterintuitive

and paradoxical to see that the lasing starts and its output power becomes higher and higher

when more loss is introduced that is less pumping is usedadds Ozdemir. his turns the conventional textbook understanding of lasers upside down. he results were published recently in the journal Science.

and estimated the intensity of light in the two resonators and surprisingly found an initial decrease in total intensity of the two resonators followed by an increase

and finally a rebirth of strong light intensity as the loss was increased. he loss added beyond a critical value increased the total light intensity and its distribution between the resonatorssays Bo Peng a graduate student.

and reversing the effects of loss in various other physical systems such as in photonic crystal activities plasmonic structures and metamaterials.

The experimental system that the researchers used consists of two tiny directly coupled silica microtoroid (doughnut-shaped) resonators each coupled to a different fiber-taper coupler that aids in guiding light from a laser diode to photodetectors;

so that light can between the fibers and the resonators. Yang says the concept will work in any coupled physical system.

because it s a strongly absorbing material at a wavelength of 1550 nanometers and it gives a good dose of losspeng explains.

We used the laser to show it. he Presidential Early Career Award for Scientists and Engineers Army Research Office US Department of energy RIKEN ithes Project MURI Center for Dynamic Magneto-Optics Grant-in-aid for Scientific research Vienna Science and Technology Fund

or events scientists zapped mice with light to make them forget. he theory is that learning involves processing in the cortex

scientists have twisted light to send data super fast, but new research shows that a similar technique with radio waves can also reach high speeds.

Faster data transmission rates have been led achievedillner himself a team two years ago that twisted light beams to transmit data at a blistering 2. 56 terabits per secondut methods to do so rely on light to carry the data. he advantage

while also being light in weighthe says. The molecule they compressed is benzene a flat ring containing six carbon atoms and six hydrogen atoms.

However many experiments in quantum information make use of just such identically prepared qubits making the technique potentially very useful. his work sheds light on some of the striking differences between information in the classical and quantum worlds.

When two tubes intersect they merge (physicists call this reconnection) causing an explosion that gives off large quantities of heat and electromagnetic radiation.

The affected solar area lights up as a solar flare. The radiation extends across the entire electromagnetic spectrum from radio waves and visible light to X-rays and gamma rays.

Observations suggest that the solar flares size distributions show a certain degree of regularity statistically speaking. vents can be arbitrarily large

Transcription factors known as genetic switches drive gene expression in plants based on external stresses such as light rain soil quality

Even light can be a stressor if you are rooted to one location. mong other things Kay s research explores how these transcription factors affect plants circadian rhythms which set the pace

< Back - Next >

Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011