Using corkscrew-shaped laser pulses, scientists at DESY have devised a sophisticated optical centrifuge that can make molecules rotate rapidly about a desired molecular axis. The innovative method opens up new ways to control and study super fast spinning molecules, called superrotors. Until now, optical centrifuges can make molecules rotate about one specific axis only. The new scheme lets scientists select between two axes. Alec Owens, Andrey Yachmenev and Jochen Küpper from the Controlled Molecule Imaging (CMI) Group at the Center for Free-Electron Laser Science (CFEL) report their theoretical concept in the Journal of Physical Chemistry Letters.
Posted on 19 October 2018 | 1:20 pm
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Posted on 18 October 2018 | 3:43 pm
We live in an age of long-range information transmitted either by underground optical fibre or by radio satellites. But the throughput today is so great that radio frequency is no longer enough in itself. Research is turning toward the use of lasers which, although technically complex, have several advantages, especially when it comes to security. However, this new technology, currently in the testing phase, faces a major problem: clouds. Due to their density, clouds stop the laser beams and scramble the transfer of information. Researchers at the University of Geneva (UNIGE), Switzerland, have devised an ultra-hot laser that creates a temporary hole in the cloud, which lets the laser beam containing the information pass through. They have published their results in the journal Optica.
Posted on 18 October 2018 | 12:15 pm
Scientists at TU Wien, the University of Innsbruck and the ÖAW have for the first time demonstrated a wave effect that can lead to measurement errors in the optical position estimation of objects. The work now published in Nature Physics could have consequences for optical microscopy and optical astronomy, but could also play a role in position measurements using sound, radar, or gravitational waves.
Posted on 16 October 2018 | 10:53 am
A UK-wide research team, led by the University of St Andrews, has developed an innovative new way to optically image through tissue, which could allow for a more detailed understanding and diagnosis of the early stages of various diseases, including cancer.
Posted on 15 October 2018 | 12:56 pm
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Posted on 15 October 2018 | 10:53 am
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Posted on 15 October 2018 | 9:45 am
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Posted on 14 October 2018 | 7:07 am
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Posted on 13 October 2018 | 5:28 pm
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Posted on 12 October 2018 | 7:05 pm
For the first time, physicists have built a unique topological insulator in which optical and electronic excitations hybridize and flow together. They report their discovery in Nature.
Posted on 12 October 2018 | 1:15 pm
What happens when a new technology is so precise that it operates on a scale beyond our characterization capabilities? For example, the lasers used at INRS produce ultrashort pulses in the femtosecond range (10-15 s), which is far too short to visualize. Although some measurements are possible, nothing beats a clear image, says INRS professor and ultrafast imaging specialist Jinyang Liang. He and his colleagues, led by Caltech's Lihong Wang, have developed what they call T-CUP: the world's fastest camera, capable of capturing 10 trillion (1013) frames per second (Fig. 1). This new camera literally makes it possible to freeze time to see phenomena—and even light—in extremely slow motion.
Posted on 12 October 2018 | 12:17 pm
Scientists from ITMO University developed a novel optical method of measuring reagent delivery rates for "labs on a chip." The method is based on a dynamic interaction between a nanoantenna and luminescent molecules as the distance between them affects light intensity. Processed mathematically, these light dynamics determine the flow speed. This method can also be used for measuring temperature and identifying flow types. The research was published in Laser & Photonics Reviews.
Posted on 11 October 2018 | 1:09 pm
An international team of researchers has used an unconventional imaging technique known as ghost imaging to make spectroscopic measurements of a gas molecule. The new approach by scientists at Tampere University of Technology in Finland, the University of Eastern Finland and the University of Burgundy Franche-Comté in France, works over a wide range of wavelengths and could improve measurements of atmospheric greenhouse gases such as methane.
Posted on 10 October 2018 | 4:09 pm
A color developed by Egyptians thousands of years ago has a modern-day application as well – the pigment can boost energy efficiency by cooling rooftops and walls, and could also enable solar generation of electricity via windows.
Posted on 10 October 2018 | 1:11 pm
A new study by scientists from the University of Bristol brings us a significant step closer to unleashing the revolutionary potential of quantum computing by harnessing silicon fabrication technology to build complex on-chip quantum optical circuits.
Posted on 10 October 2018 | 12:02 pm
One of the most enduring "Holy Grail" experiments in science has been attempts to directly observe atomic motions during structural changes. This prospect underpins the entire field of chemistry because a chemical process occurs during a transition state—the point of no return separating the reactant configuration from the product configuration.
Posted on 9 October 2018 | 7:29 pm
Optical frequency combs can enable ultrafast processes in physics, biology, and chemistry, as well as improve communication and navigation, medical testing, and security. The Nobel Prize in Physics 2005 was awarded to the developers of laser-based precision spectroscopy, including the optical frequency comb technique, and microresonator combs have become an intense focus of research over the past decade.
Posted on 8 October 2018 | 3:00 pm
White powders found at known or potential crime scenes present investigators and first responders with a dilemma. Touching the powders could be dangerous or compromise the evidence, and sending samples to a lab to be identified could take too long.
Posted on 8 October 2018 | 2:08 pm
On-line video games is something that has turn out to be more and more famous and even though humans can down load tons of games to their smartphones, avid gamers who loved the generation of on-line gaming on their computers will not have it another manner. There are a few excessive cease new games which ...
Posted on 8 October 2018 | 10:42 am
Researchers have developed a fundamentally new approach to a see-through display for augmented reality, or smart glasses. By projecting images from the glass directly onto the eye, the new design could one day make it possible for a user to see information such as directions or restaurant ratings while wearing a device almost indistinguishable from traditional glasses.
Posted on 4 October 2018 | 2:00 pm
The technique for generating high-intensity, ultra-short optical pulses developed by the 2018 Nobel Prize for Physics winners, Professor Gérard Mourou and Dr. Donna Strickland, provides the basis for important scientific approaches used in Swinburne's research.
Posted on 4 October 2018 | 12:05 pm
Scientists from ITMO University developed a laser for precise measurement of the distance between the moon and Earth. The short pulse duration and high power of this laser help to reduce errors in determining the distance to the moon to just a few millimeters. This data can be used to specify the coordinates of artificial satellites in accordance with the lunar mass influence to make navigation systems more accurate. The study was published in Optics Letters.
Posted on 3 October 2018 | 12:20 pm
Light of different colors travels at different speeds in different materials and structures. This is why we see white light split into its constituent colors after refracting through a prism, a phenomenon called dispersion. An ordinary lens cannot focus light of different colors to a single spot due to dispersion. This means different colors are never in focus at the same time, and so an image formed by such a simple lens is inevitably blurred. Conventional imaging systems solve this problem by stacking multiple lenses, but this solution comes at the cost of increased complexity and weight.
Posted on 3 October 2018 | 9:00 am
After three scientists won the Nobel Physics Prize on Tuesday for groundbreaking discoveries harnessing the power of lasers, here are a few basic facts about their research.
Posted on 2 October 2018 | 5:12 pm
Transition metal dichalcogenides (TMDCs) possess optical properties that could be used to make computers run a million times faster and store information a million times more energy-efficiently, according to a study led by Georgia State University.
Posted on 2 October 2018 | 12:58 pm
In his research, Markus Koch, Associate Professor at the Institute of Experimental Physics of Graz University of Technology (TU Graz), concentrates on processes in molecules and clusters which take place on time scales of picoseconds (10-12 seconds) and femtoseconds (10-15 seconds).
Posted on 2 October 2018 | 12:40 pm
Three scientists shared the 2018 Nobel Physics Prize on Tuesday for their work that has "revolutionised" the field of laser physics.
Posted on 2 October 2018 | 11:20 am
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Posted on 2 October 2018 | 11:01 am
Attosecond pulses enable physicists to probe dynamic processes in matter with unprecedented time resolution. This means such technology can provide better insights into the dynamics of electrons in molecules. Devising a source of ultra-fast X-ray pulsating in the attosecond range is no mean feat.
Posted on 1 October 2018 | 4:48 pm
Ultrashort optical pulses are becoming increasingly relevant in a number of applications, including distance measurement, molecular fingerprinting and ultrafast sampling. Many of these applications rely not only on a single stream of pulses—also known as "optical frequency combs"—but require two or even three of them. Nonetheless, these multi-comb approaches significantly speed up acquisition time over conventional techniques.
Posted on 1 October 2018 | 3:00 pm
Soon, powerful quantum computers will be able to easily crack conventional mathematically encrypted codes. Entangled photons generated by a spaceborne quantum source could enable hack-proof key exchange for ultra high security applications. A Fraunhofer research team has developed a high performance quantum source robust enough for deployment in space. They aim to launch the first European quantum satellite in some four years' time.
Posted on 1 October 2018 | 12:38 pm
An international team of scientists led by the University of Groningen's Zernike Institute for Advanced Materials created quantum bits that emit photons that describe their state at wavelengths close to those used by telecom providers. These qubits are based on silicon carbide in which molybdenum impurities create color centers. The results were published in the journal npj Quantum Information on 1 October.
Posted on 1 October 2018 | 11:29 am
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Posted on 30 September 2018 | 5:11 pm
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Posted on 30 September 2018 | 11:23 am
Physicists at the National Institute of Standards and Technology (NIST) have used common electronics to build a laser that pulses 100 times more often than conventional ultrafast lasers. The advance could extend the benefits of ultrafast science to new applications such as imaging of biological materials in real time.
Posted on 27 September 2018 | 6:00 pm
Engineers at Duke University have developed a way to extract a sequence of images from light scattered through a mostly opaque material—or even off a wall—from one long photographic exposure. The technique has applications in a wide range of fields from security to healthcare to astronomy.
Posted on 27 September 2018 | 2:44 pm
A team at the Center for Relativistic Laser Science, within the Institute for Basic Science (IBS), has found a completely new way to generate extreme-ultraviolet emissions; that is, light having a wavelength of 10 to 120 nanometers. Published in Nature Photonics, this method is expected to find applications in imaging with nanometer resolution, next-generation lithography for high precision circuit manufacturing, and ultrafast spectroscopy.
Posted on 27 September 2018 | 12:31 pm
Researchers have developed a new instrument that can analyze light reflected from very small or extremely dark materials such as some meteorite samples and VANTABlack, the darkest manmade substance created. The instrument is already revealing new information about these and other difficult-to-analyze surfaces.
Posted on 26 September 2018 | 4:27 pm
Thousands of daily passengers on the Los Angeles Metro will ride more securely with the deployment of cutting-edge ESA-patented screening technology to detect concealed weapons or explosives.
Posted on 26 September 2018 | 2:20 pm