This particular electromagnetic spectral range of LWIR is important for a range of applications such as LIDAR (light radar) systems
such as highly efficient Light Emitting Diodes (LEDS), lasers and radio frequency components for cooling purposes. Graphene-based film could also pave the way for faster, smaller, more energy efficient, sustainable high power electronics."
and then imaging them using Raman microscopy technique that detects the vibrations of molecules by exciting them using a microscope-focused laser beam.
when they made mice that have light-sensitive VTA neurons stay on one side of a cage by commanding the implant to shine laser pulses on the cells.
While lasers can fit this requirement they are too energy-hungry and unwieldy to integrate into computer chips.
When a laser shines on the surface of a silver cube just 75 nanometers wide,
and off at more than 90 gigahertz. here is great interest in replacing lasers with LEDS for short-distance optical communication,
While lasers can fit this requirement they are too energy-hungry and unwieldy to integrate into computer chips.
When a laser shines on the surface of a silver cube just 75 nanometers wide,
and off at more than 90 gigahertz. here is great interest in replacing lasers with LEDS for short-distance optical communication,
They were excited with a focused continuous wave 532-nm laser. The violet DPA output in (a) swamps the green beam that is clearly seen in (b),
#Engineers demonstrate the world first white lasers More luminous and energy efficient than LEDS, white lasers look to be the future in lighting and Li-Fi,
or light-based wireless communication While lasers were invented in 1960 and are used commonly in many applications,
one characteristic of the technology has proven unattainable. No one has been able to create a laser that beams white l lasers are capable of emitting over the full visible color spectrum,
which is necessary to produce a white laser. This schematic illustrates the novel nanosheet with three parallel segments created by the researchers
each supporting laser action in one of three elementary colors. The device is capable of lasing in any visible color, completely tunable from red, green to blue,
or any color in between. When the total field is collected, a white color emerges. The researchers have created a novel nanosheet a thin layer of semiconductor that measures roughly one-fifth of the thickness of human hair in size with a thickness that is roughly one-thousandth of the thickness of human hair with three
parallel segments, each supporting laser action in one of three elementary colors. The device is capable of lasing in any visible color
Cun-Zheng Ning, professor in the School of Electrical, Computer and Energy Engineering, authored the paper, monolithic white laser, with his doctoral students Fan Fan, Sunay Turkdogan, Zhicheng Liu
The technological advance puts lasers one step closer to being a mainstream light source and potential replacement or alternative to light emitting diodes (LEDS.
Lasers are brighter, more energy efficient and can potentially provide more accurate and vivid colors for displays like computer screens and televisions.
and white laser Li-Fi could be 10 to 100 times faster than LED based Li-Fi currently still under development. he concept of white lasers first seems counterintuitive
because the light from a typical laser contains exactly one color, a specific wavelength of the electromagnetic spectrum, rather than a broad-range of different wavelengths.
Sandia National Labs in 2011 produced high-quality white light from four separate large lasers. The researchers showed that the human eye is as comfortable with white light generated by diode lasers as with that produced by LEDS,
inspiring others to advance the technology. hile this pioneering proof-of-concept demonstration is impressive,
those independent lasers cannot be used for room lighting or in displays, Ning said. single tiny piece of semiconductor material emitting laser light in all colors
or in white is desired. Semiconductors, usually a solid chemical element or compound arranged into crystals, are used widely for computer chips or for light generation in telecommunication systems.
and are used to make lasers and LEDS because they can emit light of a specific color
and energy bandgaps. ur goal is to achieve a single semiconductor piece capable of laser operation in the three fundamental lasing colors.
Later on they realized simultaneous laser operation in green and red from a single semiconductor nanosheet or nanowires.
if a single white laser is ever possible. Blue, necessary to produce white, proved to be a greater challenge with its wide energy bandgap
which is required to demonstrate eventual white lasers, said Turkdogan, who is now assistant professor at University of Yalova in Turkey.
and an important breakthrough that finally made it possible to grow a single piece of structure containing three segments of different semiconductors emitting all needed colors and the white lasers possible.
significant obstacles remain to make such white lasers applicable for real-life lighting or display applications.
One of crucial next steps is to achieve the similar white lasers under the drive of a battery.
For the present demonstration, the researchers had to use a laser light to pump electrons to emit light.
and will lay the groundwork for the eventual white lasers under electrical operation
#Strength in numbers: Researchers develop the first-ever quantum device that detects and corrects its own errors Abstract:
Imaging JPK reports on the use of optical tweezers in the Schieber Research Group at Illinois Institute of technology March 18th, 2015fei Joins University of Ulm and CEOS on SALVE Project Research Collaboration:
2015eu Funded PCATDES Project has completed its half-period with success March 19th, 2015imaging JPK reports on the use of optical tweezers in the Schieber Research Group at Illinois Institute of technology March 18th,
2015jpk reports on the use of optical tweezers in the Schieber Research Group at Illinois Institute of technology March 18th, 2015light as puppeteer:
"It was an exciting challenge to merge completely different results and approaches, such as ultrafast laser optics, photoelectron spectroscopies,
March 10th, 2015photonics/Optics/Lasers Innovative light therapy reaches deep tumors March 9th, 2015quantum sensor's advantages survive entanglement breakdown:
The team used pulsed laser deposition to co-deposit epitaxial? -Bi2o3 and disordered platinum. Annealing the film in air forced the platinum to oxidize
Solvents and their potential side effects are progressively being replaced by the likes of lasers, to removed dirt and varnish from paintings.
Rice U. researchers flex muscle of laser-written microsupercapacitors May 18th, 2015announcements Nanotherapy effective in mice with multiple myeloma May 21st, 2015turn that defect upside down:
Students and faculty at Vanderbilt University fabricated these tiny Archimedes'spirals and then used ultrafast lasers at Vanderbilt and the Pacific Northwest National Laboratory in Richland,
For example, when they are illuminated with infrared laser light, they emit visible blue light. A number of crystals produce this effect, called frequency doubling or harmonic generation, to various degrees.
When infrared laser light strikes the tiny spirals it is absorbed by electrons in the gold arms.
The electrons at the center of the spirals are driven pretty vigorously by the laser's electric field.
"The nano-spirals also have a distinctive response to polarized laser light. Linearly polarized light, like that produced by a Polaroid filter, vibrates in a single plane.
when circularly polarized laser light is used. In circularly polarized light, the polarization plane rotates either clockwise or counterclockwise.
Black phosphorus reveals its secrets thanks to a scientific breakthrough made by a team from Universite de Montreal, Polytechnique Montreal and CNRS in France June 2nd, 2015new heterogeneous wavelength tunable laser diode for high-frequency
heterogeneous wavelength tunable laser diode for high-frequency efficiency June 2nd, 2015entangled photons unlock new supersensitive characterisation of quantum technology June 1st,
2015photonics/Optics/Lasers A major advance in mastering the extraordinary properties of an emerging semiconductor: Black phosphorus reveals its secrets thanks to a scientific breakthrough made by a team from Universite de Montreal, Polytechnique Montreal and CNRS in France June 2nd, 2015new heterogeneous wavelength tunable laser diode for high-frequency efficiency June 2nd,
2015entangled photons unlock new supersensitive characterisation of quantum technology June 1st, 2015ucf Research and Innovation Recognized at International Conference May 31st,201 0
and ultrafast heat current created by picosecond--one trillionth of a second--pulses of laser light,"Cahill added."
Black phosphorus reveals its secrets thanks to a scientific breakthrough made by a team from Universite de Montreal, Polytechnique Montreal and CNRS in France June 2nd, 2015new heterogeneous wavelength tunable laser diode for high-frequency
X-ray laser opens up new avenues of research in material science June 18th, 2015a new way to image surfaces on the nanoscale:
X-ray laser opens up new avenues of research in material science June 18th, 2015stanford engineers find a simple yet clever way to boost chip speeds:
X-ray laser opens up new avenues of research in material science June 18th, 2015stanford engineers find a simple yet clever way to boost chip speeds:
X-ray laser opens up new avenues of research in material science June 18th, 2015stanford engineers find a simple yet clever way to boost chip speeds:
#Sweeping lasers snap together nanoscale geometric grids: New technique creates multilayered, self-assembled grids with fully customizable shapes and compositions Down at the nanoscale,
an intensely hot laser swept across the sample to transform disordered polymer blocks into precise arrangements in just seconds."
"Our laser technique forces the materials to assemble in a particular way. We can then build structures layer-by-layer,
"Laser-assembled nanowires For the first step in grid construction, the team took advantage of their recent invention of laser zone annealing (LZA) to produce the extremely localized thermal spikes needed to drive ultra-fast self-assembly.
The sweeping laser's heat causes the elastic layer to expand--like shrinkwrap in reverse
"The direction of the laser sweeping across each unassembled layer determines the orientation of the nanowire rows,
"We shift that laser direction on each layer, and the way the rows intersect and overlap shapes the grid.
2015news and information Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
2015discoveries Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
2015announcements Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
2015imaging Robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
2015robust new process forms 3-D shapes from flat sheets of graphene June 23rd, 2015sweeping lasers snap together nanoscale geometric grids:
4-D printing to advance chemistry, materials sciences and defense capabilities June 18th, 2015discoveries Nanometric sensor designed to detect herbicides can help diagnose multiple sclerosis June 23rd, 2015sweeping lasers snap together
Scientists have made exotic new materials by creating laser-induced micro-explosions in silicon, the common computer chip material June 29th,
Scientists have made exotic new materials by creating laser-induced micro-explosions in silicon, the common computer chip material June 29th,
Scientists have made exotic new materials by creating laser-induced micro-explosions in silicon, the common computer chip material June 29th,
Scientists have made exotic new materials by creating laser-induced micro-explosions in silicon, the common computer chip material June 29th,
The method uses two lasers to measure the positions of opposite ends of a molecule,
Crucially, the JILA team verified the stability of the technique by using the two lasers to make two separate, independent measurements of a single sample.
if it is the sample or the lasers moving, Perkins explains.""This technology excites me because it opens the door to measuring the tiniest protein motions,
the team developed a smart surface with nanocavities that fit the particular target glycoprotein. To create the nanocavities,
the sugar part of the prostate cancer glycoprotein is reacted with a custom-designed molecule that contains a boron group at one end (the boron linkage forms a reversible bond to the sugar).
such as highly efficient Light Emitting Diodes (LEDS), lasers and radio frequency components for cooling purposes. Graphene-based film could also pave the way for faster, smaller, more energy efficient, sustainable high power electronics."
Replacing silver coating on catheters with graphene increases treatment effect July 9th, 2015photonics/Optics/Lasers Human color vision gives people the ability to see nanoscale differences July 9th
#Better memory with faster lasers DVDS and Blu-ray disks contain so-called phase-change materials that morph from one atomic state to another after being struck with pulses of laser light, with data"recorded"in those two atomic states.
Using ultrafast laser pulses that speed up the data recording process, Caltech researchers adopted a novel technique, ultrafast electron crystallography (UEC),
When the laser light interacts with a phase-change material, its atomic structure changes from an ordered crystalline arrangement to a more disordered,
"Today, nanosecond lasers--lasers that pulse light at one-billionth of a second--are used to record information on DVDS and Blu-ray disks,
The speed with which data can be recorded is determined both by the speed of the laser--that is,
Thus, with a nanosecond laser,"the fastest you can record information is one information unit
people have started to use femtosecond lasers, which can potentially record one unit every one millionth of a billionth of a second.
when it is hit by a femtosecond laser pulse. In UEC, a sample of crystalline Gete is bombarded with a femtosecond laser pulse,
followed by a pulse of electrons. The laser pulse causes the atomic structure to change from the crystalline to other structures
and then ultimately to the amorphous state. Then, when the electron pulse hits the sample, its electrons scatter in a pattern that provides a picture of the sample's atomic configuration as a function of the time.
the structural shift in Gete caused by the laser pulses. However, they also saw something more:
regardless of the laser speeds used.""Even if there is a laser faster than a femtosecond laser,
there will be a limit as to how fast this transition can occur and information can be recorded, just because of the physics of these phase-change materials,
ROM storage, including CDS and DVDS, uses phase-change materials and lasers to store information. Although ROM records
2015nanocrystalline Thin-film Solar cells July 15th, 2015better memory with faster lasers July 14th, 2015cancer Nanospheres shield chemo drugs,
safely release high doses in response to tumor secretions July 14th, 2015better memory with faster lasers July 14th,
2015nanocrystalline Thin-film Solar cells July 15th, 2015better memory with faster lasers July 14th, 2015polymer mold makes perfect silicon nanostructures July 14th,
2015grants/Awards/Scholarships/Gifts/Contests/Honors/Records Nanocrystalline Thin-film Solar cells July 15th, 2015better memory with faster lasers July 14th, 2015simpore, Uofr,
or when it is shot with a nondestructive laser. Multilayer molybdenum disulfide, by contrast, is easier and less expensive to produce,
and industries, including laser, solar cells, production of transistors and nanomedicine. The colloid form of these particles have very interesting properties and characteristics,
When a powerful laser interacts chemical and biological molecules, the process can excite vibrational modes of these molecules and produce inelastic scattering, also called Raman scattering, of light.
As the beam hits these molecules, it can produce photons that have a different frequency from the laser light.
While rich in details, the signal from scattering is weak and difficult to read without a very powerful laser.
if scientists want to use a different laser to test the same molecules. In turn, this requires more chemical molecules and substrates,
and they contain laser technology (developed by the University of Hertfordshire) to detect particulates from cars and lorries.
Coherent X-ray diffraction experiments, carried out at the LCLS X-ray free electron laser facility at Stanford, have allowed snapshot imaging of a single 300 nm gold nanocrystal in the picosecond time interval after the particle was excited with a laser.
The crystal was found to expand uniformly following the excitation and to reach the melting point about 50 ps later("Imaging transient melting of a nanocrystal using an X-ray laser").
"What is striking about the result, shown in the figure, is that the crystal melts from the outside
Imaging transient melting of a nanocrystal using an x-ray laser. Snapshot projection images of a gold nanocrystal, 300nm across, before and after excitation with a femtosecond laser.
The second image, 50 picoseconds after excitation, displays a low density skin that returns to the original density at later times This result has significant implications beyond our basic understanding of the melting process.
Students and faculty at Vanderbilt University fabricated these tiny Archimedes spirals and then used ultrafast lasers at Vanderbilt and the Pacific Northwest National Laboratory in Richland, Washington,
For example, when they are illuminated with infrared laser light, they emit visible blue light. A number of crystals produce this effect, called frequency doubling or harmonic generation, to various degrees.
When infrared laser light strikes the tiny spirals it is absorbed by electrons in the gold arms.
The electrons at the center of the spirals are driven pretty vigorously by the lasers electric field.
Haglund Lab/Vanderbilt) The nano-spirals also have a distinctive response to polarized laser light. Linearly polarized light,
when circularly polarized laser light is used. In circularly polarized light, the polarization plane rotates either clockwise or counterclockwise.
"In an article published in Scientific Reports("Direct laser-writing of ferroelectric single-crystal waveguide architectures in glass for 3d integrated optics),
"the group said it had employed ultrafast femtosecond lasers to produce a three-dimensional single crystal capable of guiding light waves through glass with little loss of light.
A polarized light field microscope image shows crystal junctions written inside glass with a femtosecond laser.
therefore essential for 3d laser-fabrication of PICS to achieve its full potential.""To pattern crystals in glass, the Lehigh-led group employed femtosecond lasers,
whose speed and precision make them useful for cataract and other eye surgeries. A femtosecond is one-quadrillionth,
Pulses emitted by femtosecond lasers last between a few femtoseconds and hundreds of femtoseconds. Scientists have been attempting for years to make crystals in glass in order to prevent light from being scattered as light signals are transmitted,
"The femtosecond laser provides several critical advantages, say Dierolf and Jain. The high intensity of the laser pulse enables nonlinear optical absorption.
The precise focus enables researchers to control where the laser is focused and where light is absorbed."
"We can heat the glass only locally, "says Jain, "creating the desired conditions and causing the glass to melt,
"The unique focus of the femtosecond laser also makes it possible to"write"the crystal inside the glass and not on its surface."
"Somehow, you have to get the laser inside the glass before you turn it on.
We do that by exploiting a property of the femtosecond lasers--that only at the focal point of the laser is there sufficient intensity to cause the change you want."
"If you double the intensity of the laser, you might get 20 to 100 times more absorption.
But now Fraunhofer researchers have developed a laser arc method with which layers of carbon almost as hard as diamond can be applied on an industrial scale at high coating rates and with high thicknesses.
Andreas Leson and Dr. Hans-Joachim Scheibe (left to right) successfully developed a laser arc method of depositing friction-reducing, wear-resistant coatings on components.
A pulsed laser controls the light arc In a similar style to old-fashioned film projectors, the laser arc method generates an arc between an anode and a cathode (the carbon) in a vacuum.
The arc is initiated by a laser pulse on the carbon target. This produces a plasma consisting of carbon ions,
which is deposited as a coating on the workpiece in the vacuum. To run this process on an industrial scale,
a pulsed laser is scanned vertically across a rotating graphite cylinder as a means of controlling the arc.
The laser arc method can be used to deposit very thick ta-C coatings of up to 20 micrometers at high coating rates.
Leson sees this as the first major step in using the laser arc method to save resources.
Andreas Leson, Hans-Joachim Scheibe and Volker Weihnacht received the 2015 Joseph von Fraunhofer Prize for the development of the laser arc method and the application of ta-C coatings
These droplets are made by melting a thin metal film using a pulsed laser. Their work is published in Advanced Materials 3d printing is a rapidly advancing field,
They used laser light to melt copper and gold into micrometre-sized droplets and deposited these in a controlled manner.
In this method, a pulsed laser is focused on a thin metal film. that locally melts and deforms into a flying drop.
High energy In this study, the researchers used a surprisingly high laser energy in comparison to earlier work,
In previous attempts, physicists used low laser energies. This allowed them to print smaller drops,
They had predicted previously this speed for different laser energies and materials. This means that the results can be translated readily to other metals as well.
One remaining problem is that the high laser energy also results in droplets landing on the substrate next to the desired location.
#3d potential through laser annihilation (Nanowerk News) Whether in the pages of H g wells, the serial adventures of Flash gordon,
or that epic science fiction saga that is Star wars, the appearance of laser beamsor rays or phasers or blastersultimately meant the imminent disintegration of our hero
Phay Ho, Chris Knight and Linda Young, Argonne National Laboratory) Today we recognize the laser is reality beyond science fiction,
Yet, harnessing the once-fabled destructive capabilities of certain lasers is proving invaluable on the path toward scientific discovery.
The x-ray electron-free laser (XFEL) is the perfect example of new technology and old perceptions converging on that narrow boundary between science and science fiction.
#Sweeping lasers snap together nanoscale geometric grids Down at the nanoscale, where objects span just billionths of a meter,
an intensely hot laser swept across the sample to transform disordered polymer blocks into precise arrangements in just seconds."
"Our laser technique forces the materials to assemble in a particular way. We can then build structures layer-by-layer,
"Laser-assembled nanowires For the first step in grid construction, the team took advantage of their recent invention of laser zone annealing (LZA) to produce the extremely localized thermal spikes needed to drive ultra-fast self-assembly.
The sweeping laser's heat causes the elastic layer to expandike shrinkwrap in reversehich pulls
"The direction of the laser sweeping across each unassembled layer determines the orientation of the nanowire rows,
"We shift that laser direction on each layer, and the way the rows intersect and overlap shapes the grid.
Now, a team of scientists of the Laser spectroscopy Division of Prof. Theodor W. Hnsch (Director at the Max Planck Institute of Quantum Optics and Chair for Experimental Physics at the Ludwig-Maximilians-Universitt Munich) has developed a technique
MPQ, Laser spectroscopy Division) Spectroscopic measurements on large ensembles of nanoparticles suffer from the fact that individual differences in size, shape,
Laser light is coupled into the resonator through this fibre. The plane mirror is moved point by point with respect to the fibre
This particular electromagnetic spectral range of LWIR is important for a range of applications such as LIDAR (light radar) systems,
#Making new materials with micro-explosions (Nanowerk News) Scientists have made exotic new materials by creating laser-induced micro-explosions in silicon,
"Experimental evidence of new tetragonal polymorphs of silicon formed through ultrafast laser-induced confined microexplosion").
or phases, in silicon and seen indications of potentially four more,"said Professor Rode, a laser physicist at the ANU Research School of Physics and Engineering (RSPE)."
By focusing lasers onto silicon buried under a clear layer of silicon dioxide, the group have perfected a way to reliably blast tiny cavities in the solid silicon.
they are guided by a deep understanding of how lasers interact with matter, "he said. Conventional methods for creating materials with high pressure use tiny diamond anvils to poke
However, the ultra-short laser micro-explosion creates pressures many times higher than the strength of diamond crystal can produce.
A laser measures this deflection, and models convert the data to reveal information about the materials composition.
#Better memory with faster lasers DVDS and Blu-ray disks contain so-called phase-change materials that morph from one atomic state to another after being struck with pulses of laser light, with data"recorded"in those two atomic states.
Using ultrafast laser pulses that speed up the data recording process, Caltech researchers adopted a novel technique, ultrafast electron crystallography (UEC),
"When the laser light interacts with a phase-change material, its atomic structure changes from an ordered crystalline arrangement to a more disordered,
Thus, with a nanosecond laser,"the fastest you can record information is one information unit
people have started to use femtosecond lasers, which can potentially record one unit every one millionth of a billionth of a second.
when it is hit by a femtosecond laser pulse. In UEC, a sample of crystalline Gete is bombarded with a femtosecond laser pulse,
followed by a pulse of electrons. The laser pulse causes the atomic structure to change from the crystalline to other structures,
and then ultimately to the amorphous state. Then when the electron pulse hits the sample, its electrons scatter in a pattern that provides a picture of the sample's atomic configuration as a function of the time.
the structural shift in Gete caused by the laser pulses. However, they also saw something more:
regardless of the laser speeds used.""Even if there is a laser faster than a femtosecond laser,
there will be a limit as to how fast this transition can occur and information can be recorded, just because of the physics of these phase-change materials,
ROM storage, including CDS and DVDS, uses phase-change materials and lasers to store information. Although ROM records
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