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Physics News - Physics News, Material Sciences, Science News, Physics



Physorg.com provides the latest news on physics, materials, nanotech, science and technology. Updated Daily.



 



New technique promises tunable laser devices

Tue, 19 Sep 2017 16:18:28 EDT

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a phenomenon similar to an effect observed in circular galleries, such as in some cathedrals or museums, where sound waves travel across the gallery and are reflected and refocused tightly enough that a whisper on one side can be heard on the other.



Running roaches, flapping moths create a new physics of organisms

Tue, 19 Sep 2017 13:11:25 EDT

Sand-swimming lizards, slithering robotic snakes, dusk-flying moths and running roaches all have one thing in common: They're increasingly being studied by physicists interested in understanding the shared strategies these creatures have developed to overcome the challenges of moving though their environments.



One-way track for microwaves based on mechanical interference

Tue, 19 Sep 2017 13:08:27 EDT

Devices that allow to route microwave signals are essential engineering tools. In particular, isolators, which let signals flow in one direction but block them in the other, are needed to protect sensitive equipment from harm. Now, scientists at EPFL and the University of Cambridge have demonstrated a new principle for developing such tools by harnessing the motion of microscopic drums. The study is published in Nature Communications.



Researchers develop a rapid, automatable, chip-based platform to analyze live cells

Tue, 19 Sep 2017 13:05:51 EDT

Fluorescence microscopy gives researchers incredible power to illuminate the tiniest structures and capture the real-time activities of live cells by tagging biological molecules with a veritable rainbow of fluorescent dyes. This power comes at a cost: The technology can be expensive and time-consuming and, so far, has resisted attempts at automation.



Rogue wave analysis supports investigation of the El Faro sinking

Tue, 19 Sep 2017 13:02:11 EDT

A new analysis done to support the investigation into the 2015 sinking of the El Faro cargo ship has calculated the likelihood of a massive rogue wave during Hurricane Joaquin in October of that year - and demonstrated a new technique for evaluating the probability of rogue waves over space and time.



Nonlinear physics bridges thoughts to sounds in birdsong

Tue, 19 Sep 2017 11:00:06 EDT

The beautiful sound of birdsongs emerging from the trees is a wonderful example of how much nature can still teach us, even as much about their origins are still mysterious to us. About 40 percent of bird species learn to vocalize when they are exposed to a tutor, a behavior of interest to many neurologists and neurobiologists. The other 60 percent can vocalize instinctually in isolation. The variety across species, and the relationship between the nervous system and biomechanics makes birdsong production a complex process to unravel and understand.



Cost effective quantum moves a step closer

Tue, 19 Sep 2017 10:37:19 EDT

Canadian and US researchers have taken an important step towards enabling quantum networks to be cost-effective and truly secure from attack.



Speed plus control in new computer chip—slowing down light to sound

Tue, 19 Sep 2017 07:48:54 EDT

Light travels fast – sometimes a little too fast when it comes to data processing.



Physicists develop new design for fast, single-photon guns

Tue, 19 Sep 2017 06:00:40 EDT

Researchers from the Moscow Institute of Physics and Technology and the University of Siegen have explained the mechanism of single-photon generation in diamond diodes. Their findings, published in Physical Review Applied, offer new avenues for the development of high-speed single-photon sources for quantum communication networks and quantum computers of the future.



Optical and electrical bistability study sheds light on next-gen high speed data transfer

Mon, 18 Sep 2017 16:07:36 EDT

Today, electrical bistable devices are the foundation of digital electronics, serving as building blocks of switches, logic gates and memories in computer systems. However, the bandwidth of these electronic computers is limited by the signal delay of time constants important to electronic logic operations. In an attempt to mitigate these problems, scientists have considered the development of an optical digital computer, and one team has gone so far as to demonstrate the optical and electrical bistability for switching in a single transistor.



New approach boosts performance in thermoelectric materials

Mon, 18 Sep 2017 15:57:16 EDT

Thermoelectric materials are considered a key resource for the future - able to produce electricity from sources of heat that would otherwise go to waste, from power plants, vehicle tailpipes and elsewhere, without generating additional greenhouse gases. Although a number of materials with thermoelectric properties have been discovered, most produce too little power for practical applications.



A new approach to ultrafast light pulses

Mon, 18 Sep 2017 12:26:49 EDT

Two-dimensional materials called molecular aggregates are very effective light emitters that work on a different principle than typical organic light-emitting diodes (OLEDs) or quantum dots. But their potential as components for new kinds of optoelectronic devices has been limited by their relatively slow response time. Now, researchers at MIT, the University of California at Berkeley, and Northeastern University have found a way to overcome that limitation, potentially opening up a variety of applications for these materials.



An original method of cooling ions could have new and interesting uses

Mon, 18 Sep 2017 11:08:17 EDT

When investigating atoms, scientists face a challenge: At room temperature, individual atoms in a gas have kinetic energy, and fly around at large velocities. Temperature is, in essence, the relative movement between atoms; thus the goal of getting the atoms to have small relative velocities involves freezing them to extremely cold temperatures. A group at the Weizmann Institute of Science has now developed new universal method for cooling ions.



Scientists demonstrated 1.3μm submilliamp threshold quantum dot micro-lasers on Si

Mon, 18 Sep 2017 10:12:36 EDT

Decades ago, the Moore's law predicted that the number of transistors in a dense integrated circuit doubles approximately every two years. This prediction was proved to be right in the past few decades, and the quest for ever smaller and more efficient semiconductor devices have been a driving force in breakthroughs in the technology.



Physicists guide electromagnetic waves along an infinitesimal line

Mon, 18 Sep 2017 09:30:02 EDT

(Phys.org)—Physicists have demonstrated a new mode of electromagnetic wave called a "line wave," which travels along an infinitely thin line along the interface between two adjacent surfaces with different electromagnetic properties. The scientists expect that line waves will be useful for the efficient routing and concentration of electromagnetic energy, with potential applications in areas such as integrated photonics, light-matter interactions, and chiral quantum optics.



Research creates new possibilities to design new materials with strange and exotic properties

Mon, 18 Sep 2017 09:20:02 EDT

The 2016 Nobel Prize in Physics celebrated the rich behaviour of two-dimensional (2-D) materials, like atoms, molecules, or electrons that are confined to move on a flat surface.



Researchers develop new ultra-fast 3D microscope

Mon, 18 Sep 2017 09:10:04 EDT

A new microscope can capture 3-D images of live organisms in real time. It's called the QIs-scope, an innovation from a spinoff of Universidad Carlos III de Madrid (UC3M), 4D Nature. The microscope can be used in biomedical research or to improve clinical diagnosis procedures.



Possible evidence for small, short-lived drops of early universe quark-gluon plasma

Mon, 18 Sep 2017 08:48:07 EDT

Particles emerging from even the lowest energy collisions of small deuterons with large heavy nuclei at the Relativistic Heavy Ion Collider (RHIC)—a U.S. Department of Energy Office of Science User Facility for nuclear physics research at DOE's Brookhaven National Laboratory—exhibit behavior scientists associate with the formation of a soup of quarks and gluons, the fundamental building blocks of nearly all visible matter. These results from RHIC's PHENIX experiment suggest that these small-scale collisions might be producing tiny, short-lived specks of matter that mimics what the early universe was like nearly 14 billion years ago, just after the Big Bang.



Physicists "learn the rules" of magnetic states in newly published research

Mon, 18 Sep 2017 08:41:31 EDT

Ames Laboratory scientists have found new insight to the "rules" of how magnetic states emerge and are suppressed, creating a guide for discovery of other materials with superconducting capabilities. The discovery was made through the study of the transition metal compound LaCrGe3 under temperature, pressure, and magnetic field changes.



Light to break bandwidth ceiling

Mon, 18 Sep 2017 08:10:45 EDT

The rise of big data and advances in information technology has serious implications for our ability to deliver sufficient bandwidth to meet the growing demand.



Invisibility cloak closer to becoming a reality

Mon, 18 Sep 2017 07:35:52 EDT

Photonics is a rapidly growing field in which some of the most sci-fi ideas of the not-so-distant past, are taking form. Now EU-funded research is bringing the notion of an invisibility cloak closer by using microscopic structures that can bend light.



Storing lightning inside thunder: Researchers are turning optical data into readable soundwaves

Mon, 18 Sep 2017 05:00:03 EDT

Researchers at the University of Sydney have dramatically slowed digital information carried as light waves by transferring the data into sound waves in an integrated circuit, or microchip.



Ultrafast snapshots of relaxing electrons in solids

Sat, 16 Sep 2017 04:32:16 EDT

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole behind. For a long time, scientists have suspected that the liberated electron and the positively charged hole form a new kind of quasiparticle—known as 'core-exciton'. But so far, there has not yet been a real proof of its existence. Scientists have a wide range of tools to track excitons in semiconductors in real-time. Those are generated by ordinary light, and can be employed in various applications in optoelectronics and microelectronics. On the contrary, core-excitons are extremely short-lived, and up to now, no technique was available to track their motion and deduce their properties.



Sensing with a twist: A new kind of optical nanosensor uses torque for signal processing

Fri, 15 Sep 2017 17:32:11 EDT

The world of nanosensors may be physically small, but the demand is large and growing, with little sign of slowing. As electronic devices get smaller, their ability to provide precise, chip-based sensing of dynamic physical properties such as motion become challenging to develop.



A new efficient and portable electrocaloric cooling device

Fri, 15 Sep 2017 08:40:03 EDT

(Phys.org)—A team of researchers with the University of California and SRI International has developed a new type of cooling device that is both portable and efficient. In their paper published in the journal Science, the team describes their new device and possible applications for its use. Q.M. Zhang and Tian Zhang with the Pennsylvania State University offer some background on electrocaloric theory and outline the work done by the team in California in a Perspectives piece in the same journal issue.



The hunt for light dark matter

Fri, 15 Sep 2017 07:40:02 EDT

Technology proposed 30 years ago to search for dark matter is finally seeing the light.



New study looks deeper into atoms than ever before

Fri, 15 Sep 2017 07:30:41 EDT

Scientists are now able to observe a never before seen atomic transformation that may take place in many catalytic reactions, thanks to researchers at Binghamton University and the Brookhaven National Laboratory.



Researchers find new way to manipulate magnetism

Fri, 15 Sep 2017 07:22:47 EDT

In a pioneering effort to control, measure and understand magnetism at the atomic level, researchers working at the National Institute of Standards and Technology (NIST) have discovered a new method for manipulating the nanoscale properties of magnetic materials.



Physicists predict nonmetallic half-metallicity

Fri, 15 Sep 2017 06:15:48 EDT

A team of researchers of the Russian Academy of Sciences (RAS), in collaboration with a colleague from RIKEN (Institute for Physical and Chemical Research in Japan), has provided theoretical proof of the existence of a new class of materials, spin-valley half-metals. Their paper was published in the journal Physical Review Letters. The discovery has potential applications in implantable electronics and devices based on graphene, nanotubes, and a number of other promising materials.



Physicists offer explanation for diverse galaxy rotations

Thu, 14 Sep 2017 14:30:42 EDT

Identical twins are similar to each other in many ways, but they have different experiences, friends, and lifestyles.