when to seek light in the days before a journey, and artificially triggers sensors in your eyes during the flight to trick the brain into adjusting to the new time zone.
This is done using Bright light Therapy which artificially triggers the light sensors in a person's eyes to make their brain believe the sun is coming up.
'The Neuroon is an artificial light source-it activates the light sensitive receptors that send information to our brains.'
It is happening across all light wavelengths from the ultraviolet to the infrared.''The universe is fated to decline from here on in,
is the largest multi wavelength research to date. Researchers collated data from the world most powerful telescopes, including the VIST and the VST at Chile Paranal Observatory, Nasa GALEX, WISE and a European space agency Herschel telescope.
and advised those looking to see the bright streaks of light to head to rural spots.
The best way to catch a glimpse of the light show is away from bright lights and big cities to minimise light pollution,
researchers have managed to teleport packets of light over 60 miles (100km) of optical fiber. The research could have implications for cryptography,
and light being teleported across the Danube river in Austria. In 2014, physicists at the University of Geneva teleported the quantum state of a photon to a crystal over 15 miles (25km) of optical fibre.
'or'no'to each question by looking at one of two flashing lights attached to their computer screen.
The breakthrough sheds light on the phenomenon known as'post-treatment control'-where the virus remains undetectable in some patients even after medication is stopped.
Conductive Composites has created a method to layer nickel on carbon to form a material that's light
It prevents electromagnetic radiation from penetrating its exterior, protecting whatever is inside from static, electromagnetic pulses, radio waves,
the scientists warmed the skin of patients with a laser to measure how much pain they could withstand.
pressure signals from the skin generated light pulses that activated a line of light-sensitive nerve cells. Other methods of stimulating nerves were likely to be used in real prosthetic devices,
to switching off the lights. a 11 x 11 dot matrix LED face, displays settings and third party options,
#Using optical fiber to generate a two-micron laser In recent years, two-micron lasers (0. 002 millimetre) have been of growing interest among researchers.
In the areas of surgery and molecule detection, for example, they offer significant advantages compared to traditional, shorter-wavelength lasers.
However, two-micron lasers are still in their infancy and not yet as mature as their telecom counterparts (1. 55-micron).
Moreover sources currently used in labs are typically bulky and expensive. Optical fibre-based 2 micron lasers are an elegant solution to these issues.
This is where researchers at Photonics Systems Laboratory (PHOSL) come in. In an article published in Light:
Science & Applications, the team of Camille Brès at EPFL described a way to design these lasers at a lower cost,
by changing the way optical fibres are connected to each other. Thanks to the new configuration, they were able
not only to produce very good 2 micron lasers, but also to do without an expensive and complex component that is normally required.
Bloodless surgery and long-range molecule détection Two-micron spectral domain has potential applications in medicine, environmental sciences and industry.
At these wavelengths, the laser light is absorbed easily by water molecules, which are the main constituents of human tissue.
What is more, the energy from the laser causes the blood to coagulate on the wound, which prevents bleeding.
Two-micron lasers are also very useful for detecting key meteorological data over long distances through the air.
Replacing a cop with a detour To create a 2 micron fibre laser, light is injected usually into an optical-fibre ring containing a gain region
The light circulates in the ring passing through the gain region many times thus gaining more and more power,
until becoming a laser. For optimal operation, these systems include a costly component called isolator,
which forces the light to circulate in a single direction. At PHOSL, researchers built a thulium-doped fibre laser that works without an isolator.
Their idea was to connect the fibres differently, to steer light instead of stopping it.""We plug a kind of deviation that redirects the light heading in the wrong direction,
putting it back on track, "said Camille Brès. This means no more need for the isolator,
Higher quality laser The new system not only proved to be less expensive than more traditional ones,
it also showed it could generate a higher quality laser light. The explanation is as follows: the laser output gets purified
because light interacts with itself in a very special way, thanks to the amplifying fibre's composition and dimensions,
and the high power circulating in this atypical laser architecture.""While the association of amplifying fibres
and high power usually weakens traditional lasers performance, it actually improves the quality of this laser,
thanks to our specific architecture",said Svyatoslav Kharitonov o
#Researchers learn how to steer the heart--with light We depend on electrical waves to regulate the rhythm of our heartbeat.
When those signals go awry, the result is a potentially fatal arrhythmia. Now, a team of researchers from Oxford and Stony Brook universities has found a way to precisely control these waves-using light.
Their results are published in the journal Nature Photonics on 19 october. Both cardiac cells in the heart and neurons in the brain communicate by electrical signals,
and being able to get the light to desired locations. However, as gene therapy moves into the clinic
Not only does this cast an important light on how cancer metastasizes and recruits cellular material from healthy cells,
which sheds new light on the fight against oral cancer, is published today in the journal Stem Cell Reports.
and the Pennsylvania State university have discovered accidentally a new way of using light to draw and erase quantum-mechanical circuits in a unique class of materials called topological insulators.
"It's one of those rare moments in experimental science where a seemingly random event--turning on the room lights--generated unexpected effects with potentially important impacts in science and technology."
"There was a slow drift in our measurements that we traced to a particular type of fluorescent lights in our lab. At first we were glad to be rid of it,
and then it struck us--our room lights were doing something that people work very hard to do in these materials."
the contractor that renovated the lab space for more information about the lights.""I've never had a client
when exposed to ultraviolet light, and their room lights happened to emit at just the right wavelength.
The electric field from the polarized strontium titanate was leaking into the topological insulator layer, changing its electronic properties.
Awschalom and his colleagues found that by intentionally focusing beams of light on their samples,
they could draw electronic structures that persisted long after the light was removed.""It's like having a sort of quantum etch-a-sketch in our lab,
They also found that bright red light counteracted the effect of the ultraviolet light, allowing them to both write and erase."
Using a refined procedure of solid-state nuclear magnetic resonance spectroscopy (solid-state NMR), they managed, for the first time ever,
#A resonator for electrons More than two thousand years ago the Greek inventor and philosopher Archimedes already came up with the idea of using a curved mirror to reflect light in such a way as to focus it into a point-legend has it that he used this technique to set
or parabolic mirrors are used in a host of technical applications ranging from satellite dishes to laser resonators,
for example, researchers use the light focused by the mirrors to enhance the interaction between the light waves and the atoms.
researchers need to make it easier to manipulate light at the nanoscale. Researchers at the Harvard John A. Paulson School of engineering and Applied sciences (SEAS) have done just that,
meaning that the phase of light can travel infinitely fast. This new metamaterial was developed in the lab of Eric Mazur, the Balkanski Professor of Physics and Applied Physics and Area Dean for Applied Physics AT SEAS,
and is described in the journal Nature Photonics.""Light doesn't typically like to be squeezed or manipulated but this metamaterial permits you to manipulate light from one chip to another, to squeeze,
bend, twist and reduce diameter of a beam from the macroscale to the nanoscale, "said Mazur."
But light has speed another, measured by how fast the crests of a wavelength move, known as phase velocity.
This speed of light increases or decreases depending on the material it's moving through. When light passes through water, for example, its phase velocity is reduced as its wavelengths get squished together.
Once it exits the water, its phase velocity increases again as its wavelength elongates. How much the crests of a light wave slow down in a material is expressed as a ratio called the refraction index--the higher the index,
the more the material interferes with the propagation of the wave crests of light. Water, for example, has a refraction index of about 1. 3
or all troughs--stretching out in infinitely long wavelengths. The crests and troughs oscillate only as a variable of time
This uniform phase allows the light to be stretched or squished, twisted or turned, without losing energy.
as incoming waves of light are effectively spread out and infinitely long, enabling even distant particles to be entangled.""
which also includes an LED light source, power supply, control unit, optical system, and image sensor, cost less than $3, 000 to construct.
"Starting from this intuition, Giachin and colleagues went on to conduct in depth experiments using XAFS (X-ray absorption fine structure) spectroscopy,
"In light of the overwhelming impact of spinal cord injury, new therapeutic interventions for drug discovery and cell therapy are needed urgently."
and focuses the emitted light toward the'upside'of the structure, "explained Mutsuko Hatano, a professor in the Graduate school of Science and Engineering's Department of Physical Electronics at Tokyo Institute of technology.
The self-aligned mirror goes a step further to enhance the efficiency of collecting this light by reflecting it at the lower surface area of the nanostructure."
"In other words, diamond works as an effective light waveguide in low-refractive-index environments,"said Hatano. In terms of applications, the team's nanostructures may find use in highly sensitive magnetic sensors for making biological observations or within the computational science realm for quantum computing and cryptographic communications.
#Chance effect of lab's fluorescent lights leads to discovery An accidental discovery of a"quantum Etch-a-Sketch"that may lead to the next generation of advanced computers
The team accidentally has discovered a new way of using beams of light to draw and erase quantum-mechanical circuits on topological insulators, a unique class of materials with intriguing electronic properties.
"It's one of those rare moments in experimental science where a seemingly random event--turning on the room lights--generated unexpected effects with potentially important impacts in science and technology."
"There was a slow drift in our measurements that we traced to a particular type of fluorescent lights in our lab. At first we were glad to be rid of it,
and then it struck us--our room lights were doing something that people work very hard to do in these materials."
the contractor that renovated the lab space for more information about the lights.""I've never had a client
when exposed to ultraviolet light, and their room lights happened to emit it at just the right wavelength.
The electric field from the polarized strontium titanate was leaking into the topological insulator layer, changing its electronic properties.
Awschalom and his colleagues found that, by intentionally focusing beams of light on their samples,
they could draw electronic structures that persisted long after the light was removed.""It's like having a sort of quantum Etch-a-Sketch in our lab,
They also found that bright red light counteracted the effect of the ultraviolet light, allowing them to both write and erase."
a technique using electrons (instead of light or the eyes) to see the characteristics of a sample,
then convert that light into an electrical charge proportional to its intensity and wavelength. In the case of our eyes, the electrical impulses transmit the image to the brain.
"In this structure--unlike other photodetectors--light absorption in an ultrathin silicon layer can be much more efficient
and improve light absorption without the need for an external amplifier.""There's a built-in capability to sense weak light,
"Ma says. Ultimately, the new phototransistors open the door of possibility, he says.""This demonstration shows great potential in high-performance and flexible photodetection systems,"says Ma,
the zone plates focus by diffraction--bending light as it passes the edge of a barrier.
"Essentially, it has to absorb the light completely. It's hard to find a material that doesn't reflect
Incoming light bouncing between individual silicon nanowires cannot escape the complex structure, making the material darker than dark.
graduate student Jayer Fernandes and recent graduate Aditi Kanhere--are exploring ways to integrate the lenses into existing optical detectors and directly incorporate silicon electronic components into the lenses themselves s
the zone plates focus by diffraction--bending light as it passes the edge of a barrier.
"Essentially, it has to absorb the light completely. It's hard to find a material that doesn't reflect
Incoming light bouncing between individual silicon nanowires cannot escape the complex structure, making the material darker than dark.
graduate student Jayer Fernandes and recent graduate Aditi Kanhere--are exploring ways to integrate the lenses into existing optical detectors and directly incorporate silicon electronic components into the lenses themselves s
an associate professor of the Institute of Laser Engineering at Osaka University, in cooperation with Screen Holdings Co.,Ltd.
succeeded in visualizing changes in defect density on the surface of Gan through the laser terahertz emission microscope (LTEM)
which measures THZ waves generated by laser emission. This group's discovery shows that LTEM is useful as a new method for evaluating the quality of wide-gap semiconductors
The group examined the intensity distribution of THZ generated by radiating ultraviolet femtosecond laser pulses on the surface of Gan crystal through LTEM.
Furthermore, from results measurement through modification of excited lasers, it was confirmed that THZ emission needs excitation light with larger energy than the band gap energy y
#Physicists mimic quantum entanglement with laser pointer to double data speeds In a classic eureka moment,
and Corning Incorporated is showing how beams from ordinary laser pointers mimic quantum entanglement with the potential of doubling the data speed of laser communication.
"Interestingly, a conventional laser beam (a laser pointer)' s shape and polarization can also be nonseparable.""To make the laser beam's shape and polarization nonseparable,
the researchers transformed it into what Milione refers to as a vector beam-a polarization dependent shape.
when the laser beam was separable.""In principal, this could be used to double the data speed of laser communication,
"said CCNY Distinguished Professor of Phyiscs Robert Alfano.""""While there's no'spooky action at a distance,
#This new high-power diamond laser can cut steel Although lasers based on diamond have been around around for several years,
they have never been very powerful. That beginning to change now as new CVD fabrication methods provide larger,
and the MQ Photonics Research Centre in Australia, have built just a diamond laser with 20 times more power than anything yet to date.
With 380 Watts@1240nm, the new laser has enough oomph to handle the job. While lesser lasers have made similar claims
without the actual watts behind them no amount of focussing or pulse compression can make the task worthwhile.
and you need to-switchyour laser to compress the all the power into impossibly brief pulses just to make a mark,
More typical workhorse solid state lasers, like Yb-doped disk and fiber lasers, can routinely deliver kilowatt range power.
However, they are limited ultimately by their relatively narrow wavelength coverage and inability to handle the extreme thermal loads that are part
The new diamond lasers make use of something known as Raman conversion to shift light to wavelengths that are long enough to be absorbed efficiently by steel.
Furthermore, the wavelength range of these fibers is restricted to the transparency of silica. The release stories for this laser mention that the infrared wavelengths used here are safer for the eye than either visible or UV radiation.
While that may be generally true, anything that has significant amounts of water is a potential absorber of IR energy across a fairly wide band.
It also appears to be fashionable to compare output power of cutting lasers to laser pointers,
with many noting that the new diamond laser is equal to 00,000 laser pointers. In light of the ample variance in both wavelength and power of pointer devices, those kinds of comparisons should probably be taken as rough.
Diamond lasers can potentially unleash more than just new cutting or machining technologies. Since silicon doesn reflect x-rays
imaging applications based on x-ray lasers have traditionally been limited severely. Diamond-based x-ray lasers, on the other hand, would be a whole new ball game.
CVD diamond still has its costs, but they are rapidly falling while output quality is rising.
It would seem that these trends should soon make off-the-shelf diamond lasers fairly commonplace a
#Accidental nanoparticles could let lithium ion batteries live another day A new study from MIT could keep lithium ion battery technology on the track for another few laps,
In particular, the wavelength of photons changes as they move down an optical fiber not good since creating photon with precise attributes is the whole source of quantum security.
a theoretical quantum repeater would insert too much uncertainty about the wavelength of any light it ferried Along with this technology,
These fluctuations results in very slightly different emission wavelengths, so by slowing them with cryogenic temperatures,
The device created here is a modification of a common type of antenna designed to operate at THZ wavelengths.
or until the lights flicker out. That when their distributed, or onsite generator, will kick on.
which bend incident light by precisely amounts which can be designed pre algorithmically to create lenses of differing strengths.
Until now, the amount of light bending has varied considerably depending on the wavelength of the incident light.
allowing different coloured beams of light to be focused on a single point with a single metasurface lens.
which in a conventional optical system would require light to pass through several thick lenses in sequence,
miniaturized device Traditional lenses (left) require a number of thick optical elements to focus different wavelengths of light,
which focuses multiple wavelengths to a single point from one flat surface. Traditional lenses (left) require a number of thick optical elements to focus different wavelengths of light, unlike the achromatic metasurface (right),
which focuses multiple wavelengths to a single point from one flat surface. While the majority of photographic lenses are constructed from multiple individual lens elements, each of a considerable thickness and curvature,
the new metasurface technology performs the same optical function with a single, completely flat element.
including using at least one of the following igh intensity laser pulses, pellets forming a conductive ion trail, sacrificial conductors,
This is why, at least historically, most of the market for refitting of existing lights went to Compact Fluorescent lamps (CFLS.
At the same time, the economics of LEDS are now comparable with other light sources. These changes have resulted in LEDS displacing CFLS as the choice for organizations looking to save money
So it was interesting to talk recently with Terralux, a company that focuses on offering solutions for the retrofitting of lights in existing buildings.
A light is no longer simply a device that allows you to see in the dark.
If a light sees people enter a room it will raise the lighting to a brighter level.
the lights will be lowered, providing additional energy savings. If a dangerous gas is detected in the air, or if a person using a restroom leaves it odorous,
the light can switch on an exhaust fan or trigger an alarm system. Advanced sensors provide safety and security information and alerts all through the LED LIGHTS.
In light of this Premera is stressing that the company will not email or call customers about the breach.
The system uses a beam of light on the floor, according to Georgia Tech. The warmrobots, which are in constant communication with each other,
when someone swipes the Apple ipad to drag the light across the floor, the robots follow.
"In a demonstration of the system, each robot is constantly measuring how much light is in its local eighborhood. hen there too much light in a robot area,
so that another robot can steal some of its light. he robots are working together to make sure that each one has the same amount of light in its own area,
the UCSD cloak works by manipulating electromagnetic waves, such as visible light or radio waves. Because it can scatter these waves,
The material only operates within a narrow range of wavelengths which means a single piece can only be used for a single purpose, such as hiding from radar.
Early cloaking designs required material ten times thicker than the wavelength being blocked. The UCSD cloak is effective at 1/10th of a wavelength,
allowing the team to use only a 3mm piece of material to dodge a 3cm radar wave.
The UCSD technology also can be adapted to block different wavelengths by modifying the thickness of the material being used.
while still allowing light and electrons to pass through. The new system uses such a 62.5-nanometer-thick Tio2 layer to effectively prevent corrosion
a device that you can see under an optical microscope, and wee seeing the quantum effects in a trillion atoms instead of just one.
Coauthors Aashish Clerk from Mcgill University and Florian Marquardt from the Max Planck Institute for the Science of Light proposed a novel method to control the quantum noise,
such as those obtained by LIGO, the Laser interferometry Gravitational-wave Observatory, a Caltech-and-MIT-led project searching for signs of gravitational waves,
or monochromatic light oscillates at all points in space with the same frequency but varying relative delays, or phases.
Manipulating the polarization of light is essential for the operation of advanced microscopes, cameras, and displays;
and phase of light, says Amir Arbabi, a senior researcher at Caltech and first author of the study published in Nature Nanotechnology. e can take any incoming light
and shape its phase and polarization profiles arbitrarily and with very high efficiency. MUCH THINNER THAN A HUMAN HAIR While the same goal can be achieved using an arrangement of multiple conventional optical components such as glass lenses, prisms, spatial light modulators
a metasurface device could manipulate light in novel ways that are very hard and sometimes impossible to do using current setups.
when illuminated by a horizontally polarized beam of light, and a different image when illuminated by a vertically polarized beam. he two images will appear overlapped under illumination with light polarized at 45 degrees,
Faraon says. MINIATURE CAMERAS AND MORE In another experiment, the team was able to use a metasurface to create a beam with radial polarization, that is, a beam
laser cutting, and particle acceleration. ou generally would need a large optical setup, consisting of multiple components,
These waves have a much shorter wavelength than the incident sound waves that produce them. As the evanescent waves decay very fast as they propagate,
it would also be interesting to adapt the method for ultrasound that has shorter wavelengths. ecause the size of the polymer structure has to be adjusted to the operational wavelength,
or light in a way that is precisely timed to create space structures, deployable medical devices, robots, toys, and range of other structures.
or the matching of noisy sounds with bright lights. Multimodal processing, like these mappings, may be the key to making sensory substitution devices more automatic.
explains Stiles. e found that using this device to look at texturesatterns of light and darkllustrated ntuitiveneural connections between textures and sounds, implying that there is some preexisting crossmodality,
while testing a laser-based measurement technique that they recently developed to look for what is called multipolar order.
all of the light that you see reflected from the object is at that frequency. When you shine a red laser pointer at a wall, for example,
your eye detects red light. However, for all materials, there is a tiny amount of light bouncing off at integer multiples of the incoming frequency.
So with the red laser pointer, there will also be some blue light bouncing off of the wall.
You just do not see it because it is such a small percentage of the total light.
e found that light reflected at the second harmonic frequency revealed a set of symmetries completely different from those of the known crystal structure,
whereas this effect was completely absent for light reflected at the fundamental frequency, says Hsieh. his is a very clear fingerprint of a specific type of multipolar order.
the inability to work in bright light, especially sunlight. The key is to gather only the bits of light the camera actually needs.
and its light source to work together efficiently, eliminating extraneous light, or oise, that would otherwise wash out the signals needed to detect a scene contours. e have a way of choosing the light rays we want to capture
and only those rays, says Srinivasa Narasimhan, associate professor of robotics at Carnegie mellon University. e don need new image-processing algorithms,
This is all done by the sensor. ne prototype based on this model synchronizes a laser projector with a common rolling-shutter camerahe type of camera used in most smartphoneso that the camera detects light only from points being illuminated by the laser as it scans across the scene.
This not only makes it possible for the camera to work under extremely bright light or amidst highly reflected or diffused lightt can capture the shape of a lightbulb that has been turned on,
when the camera captures ambient light from a scene. But as a projector scans a laser across the scene,
the spots illuminated by the laser beam are brighter, if only briefly, notes Kyros Kutulakos, a professor of computer science at the University of Toronto. ven though wee not sending a huge amount of photons, at short time scales,
wee sending a lot more energy to that spot than the energy sent by the sun, he explains.
The trick is to be able to record only the light from that spot as it is illuminated
this is accomplished by synchronizing the projector so that as the laser scans a particular plane, the camera accepts light only from that plane.
despite the light scattering that usually makes it impenetrable to cameras. Manufacturers also could use the system to look for anomalies in shiny or mirrored components.
Overtext Web Module V3.0 Alpha
Copyright Semantic-Knowledge, 1994-2011