Instead of using lasers or cameras and algorithms or satellite GPS, this is guided by a cable that emits a electromagnetic signal.
service design is a chance to hold the whole service up to the light and re-imagine every single part of the journey
It s a matter of having the right temperature, right moisture levels and not too much light.
The Internet of things will need more microwave bands with shorter wavelengths. Cell phones are need already to link to GPS and Wi-fi services on top of 4g and other cellular networks.
All those need antennas of different lengths and shapes to accommodate the sometimes widely spread wavelength bands.
when their length corresponds to half the wavelength of the RF signal, but for devices operating at different wavelengths this becomes a problem."
"The present solution is to have a switchable filter bank along with switchable and/or multi-band antenna, ays Jacob Adams,
a liquid metal antenna that can continuously adapt to different wavelengths by changing its length inside a capillary.
For centimeter-wavelengths, liquid metal antennas would remain separate elements in the circuitry, but for millimeter waves they could be integrated on microfluidic chips,
Now researchers at Columbia University from James Hone lab, in cooperation with a team at Korea Research Institute of Standards and Science (KRISS), have taken this huge step forward by creating the first on-chip incandescent visible light source
in a press release. his new type of'broadband'light emitter can be integrated into chips and will pave the way towards the realization of atomically thin, flexible,
depends on being able to generate light on the chip itself. While a number of approaches have been developed for generating this light,
this research marks the first time that anyone has done it with the simplest artificial light source: incandescent light.
The main reason that this was achieved never before is because of the amount of heat that incandescent light generates.
In order for these micro-scale metal wires to glow in the visible light range, they must be able to withstand temperatures reaching thousands of degrees Celsius.
Getting that level of heat to transfer out of the micro-scale wires was always a problem
and often led to damaging the surrounding chip. But graphene makes all the difference. The international team demonstrated heating the graphene-based filament to 2500 Degree celsius,
Graphene transparency was behind the discovery that emitted spectrum of light emitted had peaks at certain wavelengths.
occurred because of interference between the light emitted from the graphene filament and the light reflecting off the silicon substrate beneath it.
So it becomes possible to tune the emission spectrum by altering the distance between the filament and the substrate
it a hoto batterywhere the anode itself is made of titanium nitride and ambient light. Under artificial light, this prototype battery has a capacity of 77.8 mah/g. Itl quite happily power a small fan or LED light for about 30 seconds,
and then if you give it a break for 30 seconds while shining a light on it,
itl be charged all up and good to go again. Over 100 cycles, the battery retained a bit over 70 percent of its discharge capacity,
but getting your hopes up for a light-powered battery in your cell phone might be premature by a decade or so.
The cloak is very thinnly about a tenth the size of the wavelength of the photons it scatteringnd lossless
When combined, they create a metamaterial, capable of bending light in unusual ways. The team also varied the height of the cylinders by a small amount,
a newer version of metamaterials that has generated recently some interest. ne tenth of the wavelength is essentially like 0 in height,
with a 0. 6 cm thickness to handle 6 cm wavelengths, simply because those larger dimensions made it easier to work with.
A cloak could be made for visible light but would have to be much thinner. Because the shortest wavelength the human eye perceives is slightly less than 400 nm,
a cloak would have to be less than 40 nm thick, a dimension easily achievable by the photolithography processes used for making computer chips.
But Kante points out that microwave cloaks could be useful for the military, to hide objects from radar working at such wavelengths.
One tradeoffhe range of wavelengths covered is very narrow. Changing the design to cover a broader range makes the material more lossy.
Kante says the design might have other uses besides invisibility. For instance, it could shield antennas in cell towers from each other, lowering crosstalk.
but light absorption was low. The Gap nanowires, about 500 nm long and 90 nm thick, increased enormously the surface of the photocathode exposed to light.
#The First White Laser Scientists and engineers at Arizona State university, in Tempe, have created the first lasers that can shine light over the full spectrum of visible colors.
The device inventors suggest the laser could find use in video displays, solid-state lighting, and a laser-based version of Wi-fi. Although previous research has created red, blue, green and other lasers,
each of these lasers usually only emitted one color of light. Creating a monolithic structure capable of emitting red, green,
and blue all at once has proven difficult because it requires combining very different semiconductors. Growing such mismatched crystals right next to each other often results in fatal defects throughout each of these materials.
When excited with a pulse of light, the segments rich in cadmium and selenium gave off red light;
those rich in cadmium and sulfur emitted green light; and those rich in zinc and sulfur glowed blue.
The researchers grew this alloy in stages, carefully varying the temperature and other growth conditions over time.
The scientists can individually target each segment of the nanosheet with a light pulse. Varying the power of the light pulses that each section received tuned how intensely they shone,
allowing the alser to produce 70 percent more perceptible colors than the most commonly used light sources.
Lasers could be far more energy-efficient than LEDS: While LED-based lighting produces up to about 150 lumens per watt of electricity,
lasers could produce more than 400 lumens per watt, says Cun-Zheng Ning, a physicist and electrical engineer at Arizona State university at Tempe who worked on the laser.
In addition, he says that white lasers could also lead to video displays with more vivid colors and higher contrast than conventional displays.
Another important potential application could be"Li-Fi, "the use of light to connect devices to the Interenet.
Li-Fi ould be 10 times faster than today Wi-fi, but"the Li-Fi currently under development is based on LEDS,"
"Ning says. He suggests white-laser based Li-Fi could be 10 to 100 times faster than LED-based Li-Fi,
because the lasers can encode data much faster than white LEDS. In the future, the scientists plan to explore
whether they can excite these lasers with electricity instead of with light pulses. They detailed their findings online 27 july in the journal Nature Nanotechnology N
#Spintronic Devices Possible Without Magnetic material Spintronics, which has offered a promising alternative to electronics, may have just been given a boost that moves it from mere promise to likely future backbone of computing.
and organic materials convert low energy photons into visible light that a solar cell can capture. Cadmium selenide nanocrystals with one kind of organic coating left produced violet light,
while cadmium selenide nanocrystals with another type of organic coating right produced green. Solar cell efficiencies could increase by 30 percent
Visible light accounts for under half of the solar energy that reaches Earth's surface. Nearly all of the rest comes from infrared radiation.
which absorbs green light and emits violet light, the investigators could boost upconversion up to a thousandfold by coating the nanocrystals with anthracene, a component of coal tar.
This suggests that similar coatings on lead selenide nanocrystals might boost their upconversion efficiency as well.
and have reported substantial savings from implementing measures as simple as installing motion-sensor lights in hallways and stairwells.
#Purelifi Raises £1. 5m For Tech That Uses Pulsating LED Light To Create Wifi Alternative Purelifi,
an alternative to wireless networking, such as Wifi or 5g, based on visible light communication (VLC). Specifically, the tech uses pulsating LED light, imperceptible to the human eye,
as a way of sending data from one Lifi-equipped device to another. Today the startup is disclosing that it raised £1. 5 million in a new round of funding led by Scottish-based angel group London & Scottish Investment Partners (LSIP), with additional funding from the Scottish
which is observed as visible light. If the current is varied slowly the output intensity of the light dims up and down.
Because LED bulbs are semiconductor devices, the current, and hence the optical output, can be modulated at extremely high speeds
which can be detected by a photodetector device and converted back to electrical current. The intensity modulation is imperceptible to the human eye,
Using near infrared spectroscopy the device connects with a mobile app and a cloud-based database of items to quickly scan
The accessories in question range from sensors, to lights, to thermostats, to smart outlets and come from a group of accessory-makers with a trusted reputation in the connected home industry.
This Homekit version lets users control lights in specific areas, as well as check with Siri to see
if lights are either on or off in specific areas of the house you might not be able to see at any given moment.
you can control specific rooms or groups of lights separately, or turn everything off with voice commands.
That the goal that Zhou Yaopeng and Marc Albanese, two former photonics researchers who met at Boston University nearly a decade ago,
#Laser-Radio links Upgrade the Internet The rise of Wi-fi and cellular data services made Internet access more convenient and ubiquitous.
Technology that uses parallel radio and laser links to move data through the air at high speeds,
AOPTIX technology takes the form of a box roughly the size of a coffee table with an infrared laser peering out of a small window on the front,
AOPTIX teamed up the laser and radio links to compensate for weaknesses with either technology used alone.
Laser beams are blocked by fog, while millimeter wave radio signals are absorbed by rain. Routing data over both simultaneously provides redundancy that allows an AOPTIX link to guarantee a rate of two gigabits per second with only five minutes or less downtime in a year,
The radio and laser equipment inside an AOPTIX device move automatically to compensate for the swaying of a cell tower caused by wind.
AOPTIX originally developed its laser technology for the Pentagon, designing systems that actively steer laser beams to keep data moving between ground stations, drones, and fighter jets.
It began by splashing blue strobe lights and repeating the word wesomeenough times to suggest that it might have doubts about the merit of
#Will a Breakthrough Solar technology See the Light of Day? The power unit is a rectangular slab about the size of a movie theater screen.
That raises a disturbing possibilityight a breakthrough technology that could make solar power truly competitive never see the light of day, not because of any lack of technical merit,
The idea is that you can increase the amount of energy any solar cell gathers by putting lenses over the cell to focus light into it.
Some wavelengths of light would be absorbed by one material, and the rest would pass to the semiconductors below, and so on.
light would be delivered to that array via optical fiber, and each of the tiny elements would reflect some of that light to create the light field for a particular point in 3-D space.
The array could be semitransparent to allow a person to see the real world at the same time. Multiple layers of such tiny mirrors would allow the display to produce the illusion of virtual objects at different distances.
Magic Leap is also trying to recruit people skilled in lasers, mobile and wireless electronics, cameras,
and other stimuli such as light and electricity have been around for decades. You can find them in cars airplanes robots and medical implants.
which are common in aircraft because of their light weight and high strength. And though others have worked on carbon composites that can respond to a specific stimulus such as heat Cros says in the new approach the carbon composites can be paired with a variety of shape-shifting materials that respond to different environmental triggers.
because organic light-emitting molecules can be deposited over large surfaces. They also run cooler than LEDS,
It does this via nanoparticles that ease the transition for light as it passes between the parts of an OLED device.
and allows more light out. Various companies are also making progress toward lowering costs. Konica-Minolta and OLED Works (a business formed from Kodak former OLED division) are both developing cheaper new manufacturing techniques.
This fall, Konica-Minolta will start full-scale production of OLED lights on flexible plastic sheets.
which should be faster and cheaper than making OLED lights in batches, as is done now.
and blue light, but the blue light is relatively inefficient. Last week Stephen Forrest, a professor of materials science and engineering at the University of Michigan, published work on a more efficient,
longer-lasting blue material that might solve this problem. LEDS produce a beautiful sheet of light,
Michael Graetzel, who directs the Laboratory of Photonics and Interfaces at the Ecole Polytechnique in Lausanne
An experimental programmable headlight automatically adjusts thousands of tiny individually controlled light sources to prevent other drivers from being blinded while still highlighting signs or obstacles ahead.
and selectively disable the light directed at them and it can do this at up to 140 miles per hour.
or even reduce the glare during a snowfall by distributing light between snowflakes. Improving the ability to drive in the dark
or dim the lights if a pedestrian is crossing but they lack the ability to improve lane illumination.
The projector uses a light source that is 4700 lumens (much brighter than a halogen headlight) with an array of almost 800000 micromirrors that can be controlled individually by the computer.
The ability to control the light with so many micromirrors provides a high-resolution, highly tunable system that can also turn on
The front sensor calculates the position of objects by observing how they distort an invisible pattern of infrared light by a tiny projector in the sensor.
To make the ceramic nano-trusses Greer s lab uses a technique called two-photon interference lithography.
It s akin to a very low-yield 3-D laser printer. First they use this method to create the desired structure a lattice out of a polymer.
Rather than the pixels being illuminated by a backlight, each pixel glows on its own, like a minuscule light bulb.
and LIDAR, or laser-scanning, to make sure it stays between rows of mature cornstalks without hitting them.
Although such fields could also be fertilized at any time via irrigation, only about 15 percent of U s. cornfields are irrigated.
Maimone has been working on an entirely new kind of augmented reality device that is light and compact, and offers a wide field of view.
and the eye to modulate the light and form the perceived image, says Maimone. ince the light rays that hit each display pixel come from the same direction,
often used in everyday cameras to block normally unwanted light signals in pictures. Then they added a filter that only allowed infrared light through,
along with a ring of several cheap near-infrared LEDS. By doing so, they essentially made each camera act as an infrared camera. computer with Microsoft image of person's face e kind of turned the camera on its head
The Microsoft team says it wanted to use the reflective intensity of infrared light as something like a cross between a sonar signal and a torch in a dark room.
The light would bounce off the nearby object and return to the sensor with a corresponding intensity.
when it comes to visible light. But the group needed to train the machines (in this case a Samsung galaxy Nexus smartphone and a Microsoft Lifecam Web camera) on that relationship,
The new design uses three backlights one red, one blue, and one green, that illuminate all of the pixels in the display in very rapid successionoo quickly for the eye to perceive.
when it opens to let light through. If it just open for when the blue light is on it looks blue.
Opening it also for some red or green would allow those colors to blend, to create different shades.
In the short term however a much simpler approach stacking different semiconducting materials that collect different frequencies of light could provide nearly as much of an increase in efficiency as any radical new design.
which measures changes in blood flow by shining a light on the skin and measuring how it scatters off blood vessels (this is often done in hospitals with a device that fits over your fingertip).
photodetector, and accelerometer into an earbud. The emitter shines an infrared light on a part of the ear between the concha and antitragusssentially, the lower part of the bowl of your ear,
just above your earlobend the photodetector picks up the light that scatters off nearby blood vessels.
The accelerometer, meanwhile, measures your movement. A digital signal processor (which can be housed inside or outside the earbud) analyzes the data,
#Adaptive Material Could Cut the Cost of Solar in Half A material with optical properties that change to help it capture more incoming sunlight could cut the cost of solar power in half, according to Glint Photonics,
The sheet of glass is covered with reflective materials on the front and the back that trap light inside the glass.
When a beam of concentrated light from the array of lenses hits the material, it heats up part of it,
which in turn allows light to enter the glass sheet. The material remains reflective everywhere else, helping to trap that light inside the glassnd the light bounces around until it reaches the thin edge of the glass,
where a small solar cell is mounted to generate electricity. As the day goes on, the beam of light from the lenses moves and the material adapts,
always allowing light in only where the beam of light falls, and reducing the need to keep the apparatus pointed directly at the sun. Glint CEO Peter Kozodoy says solar power from its devices could cost four cents per kilowatt-hour,
compared to eight cents per kilowatt-hour for the best conventional solar panels. This month, the company received the first installments of a $2. 2 million grant from ARPA-E. The ARPA-E funding will allow the company to scale up from prototypes just 2. 5 centimeters across to make 30
which some of the light is absorbed or reflected en route to the solar cells r
#Cheap and Nearly Unbreakable Sapphire Screens Come into View This fall, rumor has it, Apple will start selling iphones with a sapphire screen that is just about impossible to scratch.
The algorithm alters the light from each individual pixel so that, when fed through a tiny hole in the plastic filter, rays of light reach the retina in a way that re-creates a sharp image.
Researchers say the idea is to anticipate how your eyes will naturally distort whatever onscreenomething glasses
which causes different parts of the lens to refract light differently. While similar methods have been tried before,
which advises users on how much insulin they should take in light of information recorded on their smartphones:
It allows adaptation of regulations and conventions in light of emerging information on benefits, risks,
Each one focuses light onto 29 megapixel chip. The dome is designed so that the fields of view of each of the small telescopes overlap to cover around 10,000 square degrees of sky simultaneously
and for now it works only with a single wavelength of light but it s the first time that anyone has been able to generate electrical current using these high-energy electrons.
and figuring out how to make them with high precision (see Capturing More Light with a Single Solar cell and Nanocharging Solar).
and germination patterns are influenced by green light and that light frequency also influences the biomass of certain plants as well as their nutritional content.
For example higher levels of red light increases tomato yield and the Vitamin c content of mustard spinach and green onions.
Green light also contributes to the plant growth and development say Singh and co. Exactly how light of various frequencies influences plant growth biomass and nutritional content is understood not well.
Which is why plant scientists all over the world are currently studying this phenomenon in an effort to exploit it in future.
That they were ever there is discernable only by a close examination of the screen protector in the right light
and waits for an ultraviolet light to switch on to cure the glue. Then it can withdraw to pick up a new rod.
that industry often uses manual assembly to put them together. n the field of optical electronics people have not found a good way to integrate indium phosphide lasers with silicon components,
The project seems more puzzling in light of the hard times at other electric car battery factories in the United states. In 2009,
#Apps by the Dashboard Light Starting next month, many car buyers will be getting a novel feature:
Operating on the visible light spectrum band, screen-camera communication is free of electromagnetic interference, offering a promising alternative for acquiring short-range information.
Laser-sealing eye blood vessels can save central vision, but this often sacrifices peripheral and night vision, according to the researchers at the Johns hopkins university and the University of Maryland.
Laser-sealing eye blood vessels can save central vision, but this often sacrifices peripheral and night vision, according to the researchers at the Johns hopkins university and the University of Maryland.
which is invisible to the naked eye that you'd need to put an ultraviolet light on,
*Carbon fibre bicycle frames are popular with cyclists as they are so light, but they are also liable to crack.
which is invisible to the naked eye that you'd need to put an ultraviolet light on,
*Carbon fibre bicycle frames are popular with cyclists as they are so light, but they are also liable to crack.
The ultrathin graphene was turned into a superheated filament-just like the thin wire of an incandescent light bulb
The light was so intense it could be seen with the naked eye even though it was on the atomic scale,
The discovery could be used as the basis of a new kind of switching device for future optical computers that use pulses of light rather than electricity to process
which has its own visible light source, said James Hone, professor of mechanical engineering at Columbia University in New york, co-author of the study published in the journal Nature Nanotechnology."
This new type of'broadband'light emitter can be integrated into chips and will pave the way towards the realisation of atomically thin, flexible and transparent displays,
visible light.""The visible light from atomically thin graphene is so intense that it is visible even to the naked eye,
without any additional magnification,"said Young Duck Kim of Columbia, the co-lead author of the study.
Creating such small light sources on the surface of a computer chip is considered essential for developing the fully integrated"photonic"circuits of optical computers,
The researchers also found that it was possible to vary the wavelengths of the light by altering the distance of the graphene wafers suspended over the silicon substrate of the chip-a potentially useful way of tuning the light source
The ultrathin graphene was turned into a superheated filament-just like the thin wire of an incandescent light bulb
The light was so intense it could be seen with the naked eye even though it was on the atomic scale,
The discovery could be used as the basis of a new kind of switching device for future optical computers that use pulses of light rather than electricity to process
which has its own visible light source, said James Hone, professor of mechanical engineering at Columbia University in New york, co-author of the study published in the journal Nature Nanotechnology."
This new type of'broadband'light emitter can be integrated into chips and will pave the way towards the realisation of atomically thin, flexible and transparent displays,
visible light.""The visible light from atomically thin graphene is so intense that it is visible even to the naked eye,
without any additional magnification,"said Young Duck Kim of Columbia, the co-lead author of the study.
Creating such small light sources on the surface of a computer chip is considered essential for developing the fully integrated"photonic"circuits of optical computers,
The researchers also found that it was possible to vary the wavelengths of the light by altering the distance of the graphene wafers suspended over the silicon substrate of the chip-a potentially useful way of tuning the light source
and Korea Research Institute of Standards and Science said that they have demonstrated for the first time an on-chip visible light source using graphene as a filament.
"This new type of'broadband'light emitter can be integrated into chips and will pave the way towards the realisation of atomically thin, flexible,
#New laser device spells end for diabetic finger pricking LONDON: A new technology developed by an Indian-origin scientist,
which uses a laser device may be able to non-invasively monitor blood glucose levels and eliminate the need for daily finger pricking for diabetics.
uses a small device with low-powered lasers to measure blood glucose levels without penetrating the skin.
At the heart of the new technology is a piece of nano-engineered silica glass with ions that fluoresce in infrared light when a low power laser light hits them.
which uses a laser device may be able to non-invasively monitor blood glucose levels and eliminate the need for daily finger pricking for diabetics.
uses a small device with low-powered lasers to measure blood glucose levels without penetrating the skin.
At the heart of the new technology is a piece of nano-engineered silica glass with ions that fluoresce in infrared light when a low power laser light hits them.
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