Reginald L. Goodwin's Posts (3028)

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JSNN...


The Joint School of Nanoscience and Nanoengineering is a collaborative project of North Carolina A&T State University and the University of North Carolina at Greensboro.


JSNN’s mission is to train students to conduct basic and applied research in nanoscience and nanoengineering, and to work closely with the Piedmont Triad community to help enhance opportunities for economic and academic growth through its outreach and engagement activities.

Although Nanoscience and Nanoengineering deal with structures that are invisible to the human eye, their potential to improve daily life is quite substantial. For example as you are reading this, nanoscience and nanoengineering are providing new means of drug delivery, new dental adhesives, new cosmetics, new heat resistant coatings, and a range of other products that can make our lives safer and more productive. The advances in nanoscience and nanoengineering mean that more corporations are forming to design and produce nanoproducts. The financial implications of these new industries will be significant. According to Lux Research, the projected economic impact of nanotechnology on the global economy is $3.1 trillion by 2015. JSNN seeks to develop collaborations with the local and regional businesses that will raise the Triad’s Nanotechnology profile with the goal of attracting new industry and investment to the area and by doing so helping to stimulate the economic growth.1

Federal funding of a prestigious research institute at N.C. A&T State University that is developing new kinds of biomaterials for use in regenerative medicine has been extended beyond its five-year term.



The extension will bring millions of additional dollars to A&T and give the school more time to develop technologies with commercial potential. It will also increase the possibility of lucrative partnerships with Triad nanotechnology and medical companies.



Officials with the Engineering Research Center for Revolutionizing Metallic Biomaterials said they have received the results of a critical review by the National Science Foundation. The NSF awarded N.C. A&T a research grant worth about $18.5 million over five years to establish the ERC in 2008.2

1. Joint School of Nanoscience and Nanoengineering
2. The Business Journal - N.C. A&T State gets key funding increase for research center

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LEAP...


The LEAP (Leadership, Education, and Partnership) Academy University Charter School is a kindergarten through 12th-grade (K-12) public charter school that serves Camden City with one core principle: all children and families deserve access to a quality public education.

Since 1997, LEAP has become a national model for urban education. It provides a high quality, holistic education for 1,000 urban learners and families, while guaranteeing every LEAP graduate an opportunity to earn a college degree.



LEAP Academy's three academic units—LEAP Lower School (K-6), LEAP Upper School (7-12) and a specialized STEM High School (9-12)—promote high expectations for students, personal development and successful college and career goals.




For more than 15 years this innovative approach has translated into tremendous success for students and families. Each year LEAP Academy graduates 100 percent of its senior class with all alumni admitted to college, where they are shaping their futures and the future of Camden City.

 

The Fabrication Lab (Fab Lab) at the STEM campus is a workshop where students can take their ideas through a complete process from conception to reality. One side of the Fab Lab holds computers with Computer-Aided Design (CAD) software where students draft their ideas. CAD software, Google SketchUp and Autodesk Inventor, allow students to create 3D digital prototypes. The other side of the lab houses machinery that brings students' 3D designs to life.

 

The CAD Software on the computers and the machinery in the Fab Lab work together enabling students to be creative, imaginative, and highly practical. The Fab Lab at LEAP Academy STEM is a place where students can identify needs and create real, working solutions for social problems in the community. For example, students can use the Fab Lab to design and create a home water filtration system to address the issue of clean water in Camden. Simultaneously, the Fab Lab encourages innovation and community engagement while teaching STEM skills and real world application.

 

More Information Contact
Dr. Alex Nieves, Director, Fabrication Lab
alex.nieves@camden.rutgers.edu | 856. 614.3292 | Extension 7320

 

Site: LEAP Academy - STEM Campus

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Storing Photons...

Physics World

Physicists in the UK have come up with a new way of storing a handful of photons in an ultracold atomic gas, in which strong interactions between neighbouring photons can be switched on and off using microwaves. The team believes that the technique could be used to create optical logic gates in which single photons could be processed one at a time. The method could also prove useful for connecting quantum-computing devices based on different technologies.


Optical photons make very good "flying" quantum bits (qubits) because they can travel hundreds of kilometres through fibres without losing their quantum information. However, it is very difficult to get such photons to interact either with each other or with "stationary" qubits such as those based on trapped ions or tiny pieces of superconductor. Exchanging quantum information between such devices can therefore be tricky.

What Charles Adams and colleagues at Durham University have now done is come up with a way of storing individual optical photons in highly excited states of an atomic gas. Once stored, the photons can be made to interact strongly, before being released again. An important feature of the technique is that it uses microwaves, which are also used to control some types of stationary qubit.

The Durham experiment involves holding up to 100 rubidium atoms in an optical trap created at the focus of a laser beam, before two pulses of light are fired at the trapped atoms. One pulse is "signal" light that is to be stored and the other is "control" light. The control light allows 10 or so neighbouring rubidium atoms to absorb a signal photon, creating a collective state called a "Rydberg polariton". Such a state is similar to that of a Rydberg atom, which has an electron in a highly excited state – in this case, with a principal quantum number of 60.

 

Physics World: Stored photons interact with atom cloud

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Let The Children Lead...


January 29, 2013

Published: January 29, 2013

By Jodie Sovereign

Hi, my name is Jodie. I am eight years old. I am studying space. I like studying space because we will never know everything about it. When I watched Into the Universe with Stephen Hawking on Blu Ray, it answered a lot of my questions, like How did the universe start and may time travel be possible? Stephen Hawking says he is a physicist and a dreamer. In episode one, "Aliens," he asked the question, "Do aliens exist?" Stephen Hawking had some very creative ideas of what aliens might look like. He also said that they may just take what they need from us—or never think about us.



Regional Multicultural Magnet School




Jodie Sovereign is a 2nd grader at the Regional Multicultural Magnet School in New London, Connecticut. Besides science, she enjoys reading, playing with her stuffed animals, and soccer. She hopes to be a teacher when she grows up.

 

Physics Today: Into the Universe with Stephen Hawking: A review | Singularities

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Table-Top Neutrons...

...almost like Moore's Law and particle physics.



A new compact high-flux source of energetic neutrons has been built by physicists in Germany and the US. The new laser-based device has the potential to be cheaper and more convenient than the large neutron facilities currently used by physicists and other scientists. The inventors say the source could be housed in university laboratories and might also be used to identify illicit nuclear material.



Neutrons are a valuable tool for scientists in many fields, allowing them to probe the structure and dynamics of a range of materials. Today, the main drawback of neutron science is that intense beams of neutrons must be produced in either nuclear reactors or dedicated accelerator facilities – making a laser-based table-top source very attractive.

 

Physics World: Neutrons on a lab bench

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The Challenge...


"Over 54% of black men who express an initial interest in majoring in the natural sciences, engineering or economics switch to the humanities or social sciences compared to less than 8% of white men," the study authors write. As for women, "33% of white women switch out of the natural sciences, engineering and economics with 51% of black women switching." Students with "relatively weaker academic backgrounds [are] much less likely to persist in natural sciences, engineering and economics majors." This means that "the convergence of black/white grades is then a symptom of the lack of representation among blacks in the natural sciences, engineering and economics," the authors argue. The grade point averages of black students rise over their college careers, in other words, because a higher percentage of them move to less difficult and higher-graded majors.
News one

Science Career Blogs:

The Grio:

Don't Quit

When things go wrong, as they sometimes will,
When the road you're trudging seems all uphill,
When the funds are low and the debts are high,
And you want to smile, but you have to sigh,
When care is pressing you down a bit,
Rest, if you must, but don't you quit.

Life is queer with its twists and turns,
As every one of us sometimes learns,
And many a failure turns about,
When he might have won had he stuck it out;
Don't give up though the pace seems slow--
You may succeed with another blow.

Often the goal is nearer than,
It seems to a faint and faltering man,
Often the struggler has given up,
When he might have captured the victor's cup,
And he learned too late when the night slipped down,
How close s/he was to the golden crown.

Success is failure turned inside out--
The silver tint of the clouds of doubt,
And you never can tell how close you are,
It may be near when it seems so far,
So stick to the fight when you're hardest hit--
It's when things seem worst that you must not quit.

- Author unknown

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Nanotubes On A Chip...


The circular patch of carbon nanotubes on a pink silicon backing is one component of NIST’s new cryogenic radiometer, shown with a quarter for scale. Gold coating and metal wiring has yet to be added to the chip. The radiometer will simplify and lower the cost of disseminating measurements of laser power.

Credit: Tomlin/NIST

The National Institute of Standards and Technology (NIST) has demonstrated a novel chip-scale instrument made of carbon nanotubes that may simplify absolute measurements of laser power, especially the light signals transmitted by optical fibers in telecommunications networks.

 

The prototype device, a miniature version of an instrument called a cryogenic radiometer, is a silicon chip topped with circular mats of carbon nanotubes standing on end.* The mini-radiometer builds on NIST's previous work using nanotubes, the world's darkest known substance, to make an ultraefficient, highly accurate optical power detector,** and advances NIST's ability to measure laser power delivered through fiber for calibration customers.***

 

"This is our play for leadership in laser power measurements," project leader John Lehman says. "This is arguably the coolest thing we've done with carbon nanotubes. They're not just black, but they also have the temperature properties needed to make components like electrical heaters truly multifunctional."

 

NIST: 'Nanotubes on a Chip' May Simplify Optical Power Measurements

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Eyes On The Stars...


Courtesy: Essence

Ronald E. McNair was born October 21, 1950, in Lake City, South Carolina. Died January 28, 1986. Survived by wife Cheryl, & two children. Was 5th degree black belt Karate instructor & performing jazz saxophonist. Enjoyed running, boxing, football, playing cards, & cooking.



Ronald E. McNair graduated from Carver High School, Lake City, South Carolina, in 1967; received BS in Physics from North Carolina A&T State University in 1971 and Ph.D. in Physics from Massachusetts Institute of Technology in 1976; received honorary doctorate of Laws from NC A&T State University in 1978, an honorary doctorate of Science from Morris College in 1980, & an honorary doctorate of science from the University of South Carolina in 1984.



SPECIAL HONORS:

Graduated magna cum laude from North Carolina A&T (‘71) - named Presidential Scholar (‘67-’71), Ford Foundation Fellow (‘71-’74), National Fellowship Fund Fellow (‘74-’75), NATO Fellow (‘75) - winner of Omega Psi Phi Scholar of Year Award (‘75), Los Angeles Public School System’s Service Commendation (‘79), Distinguished Alumni Award (‘79), National Society of Black Professional Engineers Distinguished National Scientist Award (‘79), Friend of Freedom Award (‘81), Who’s Who Among Black Americans (‘80), an AAU Karate Gold Medal (‘76), 5 Regional Blackbelt Karate Championships.

About: Ronald E. McNair, PhD

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AIP, America, STEM...

National Robotics Challenge

Science, Technology, Engineering and Math (STEM) education is a subject of much discussion in Washington. The National Research Council report, Research Universities and the Future of America, was the topic of two hearings in the House Committee on Science, Space and Technology in the last Congress and continues to generate discussion among policy makers. Scientific professional societies, including the American Physical Society, American Association of Physics Teachers both AIP Member Societies, and the American Chemical Society, have issued reports including those on the status of graduate education in their disciplines. These and other recent reports have generated momentum and an increased desire among decision makers to take action to improve US STEM education.



The National Science and Technology Council’s Committee on Science, Technology, Engineering, and Math Education (CoSTEM), established by the America COMPETES Act of 2010, created an inventory in February 2012 of Federal STEM education activities and developed a 5-year strategic Federal STEM education plan. The purpose of CoSTEM is to coordinate Federal programs and activities relating to STEM education. This strategic plan will likely continue to be a resource to the Obama Administration as it continues to focus on STEM education issues.



The President issued a call to action in his 2011 State of the Union address to train 100,000 new STEM teachers over the next 10 years to improve access to and the quality of STEM education. This initiative began as a recommendation in a report, Prepare and Inspire, produced by the President’s Council of Advisors on Science and Technology (PCAST) and has now become a collaborative movement, known as 100kin10, composed of over 100 partner organizations that have and will continue to commit to increasing the number of STEM teachers. Increasing the number of new teachers is a primary focus, however these organizations recognize the need to continue to support existing STEM teachers while increasing the number of new teachers.

American Institute of Physics: STEM Education: An Update and Overview of Policy Discussions

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What Might Have Been...


Hadiya: Arabic, “guide to righteousness; gift.”



The Hadiya Kingdom (r. 13th century-15th century) was an ancient kingdom once located in southwestern Ethiopia, south of the Abbay River and west of Shewa. It was ruled by the Hadiya people, who spoke the Cushitic Hadiyya language. The historical Hadiya area was situated between Kambaat, Gamo, and Waj, southwest of Shewa. By 1850, Hadiya is placed north-west of lakes Zway and Langano but still between these areas. (Wikipedia)

Smiley

Site: Dr. Martin Luther King Jr. College Prep High School

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Minkowski Multiuniverse...

Lecture from University of Oregon - "The Beginning of Time"

TECHNOLOGY REVIEW: Metamaterials are synthetic substances with nanoscale structures that manipulate light. This ability to steer photons makes them the enabling technology behind invisibility cloaks and has generated intense interest from researchers.

 

The ability to guide light has more profound consequences, however. Various theoreticians have pointed out that there is a formal mathematical analogy between the way certain metamaterials bend light and the way spacetime does the same thing in general relativity. In fact, it ought to be possible to make metamaterials that mimic the behaviour of not only our own spacetime but also many others that cosmologist merely dream about.

 

Indeed, a couple of years ago we looked at a suggestion by Igor Smolyaninov at the University of Maryland in College Park that it ought to be possible to use metamaterials to create a multiverse in which different regions of the material corresponded to universes with different properties.

 

Today, Smolyaninov and a couple of buddies announce the extraordinary news that they have done exactly this. They’ve created a metamaterial containing many “universes” that are mathematically analogous to our own, albeit in the three dimensions rather than four.

 

The experiment is relatively straightforward. Metamaterials are usually hard to engineer because they are based on nanoscale structures. However, Smolyaninov and pals have instead exploited the self-assembling nature of cobalt nanoparticles suspended in kerosene.

 

Cobalt is ferromagnetic so the nanoparticles tend to become aligned in a magnetic field. In fact, if the density of nanoparticles is high enough, the field causes them to line up in columns. When this happens, the nanocolumns form a metamaterial which is mathematically equivalent to a 2+1 Minkowski spacetime.

 

So light passing through behaves as if this region has one dimension of time, aligned with the nanocolumns, and two dimensions of space, perpendicular to the nanocolumns.

 

That creates a single Minkowski universe. The trick that Smolyaninov and pals have pulled off is to create a multiverse containing many Minkowski spacetimes.


Wolfram Mathworld: Minkowski Space
Physics arXiv:
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Timbuktu...



Because of Diola Bagayoko's (pictured left) expertise in educational theory and physics, his wife thought that he would be the perfect person to help undergraduates, especially African-Americans and other underrepresented minorities at Southern University in Baton Rouge, Louisiana, start their careers in science, technology, engineering, and mathematics (STEM).

Established in 1990 with funding from the National Science Foundation (NSF) and the Louisiana Board of Regents, the Timbuktu Academy is an award-winning mentoring program for underrepresented minorities in STEM fields. The program's pre-college to graduate curricula includes the Undergraduate Research Program (URP), which provides students with the educational support they need to succeed in graduate school. Bagayoko, a solid-state physicist and native of Mali, named the academy after the medieval Malian city of Timbuktu, which was renowned for its scholarship.

In the beginning, Timbuktu Academy provided mentoring only for physics undergraduates and a handful of pre-college students, but with the help of additional funding from the Department of the Navy and the Office of Naval Research (ONR), in 1993 the academy added chemistry and engineering majors and 100 to 200 pre-college students. To date, the academy's URP has sent 74 students -- 47 in physics -- to science and engineering graduate programs throughout the country, including the University of Michigan, Stanford, and Cal Tech. Moreover, 19 have earned M.S. degrees and 8 have earned Ph.D.s with many others nearing completion.

MySciNet: Timbuktu Academy: Mentoring Future Scientists
Site: Timbuktu Academy of Science and Technology


1996 Presidential Award Recipient

2002 Presidential Award Recipient
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Mr. Polite...



Polite Stewart, Jr. received his degree in physics Friday at the ripe old age of 18.

 

Stewart entered Southern four years ago to enormous fanfare. He was under a microscope as his classmates learned of the student on campus who was too young to get a driver’s license and actually too young to live on campus alone.

 

He had offers from colleges across the country. Who didn’t want a child prodigy on their campus? But, it would have been difficult for his parents to send him across the country at such a young age.

 

Instead, he enrolled at Southern where he was familiar with the campus, where he had taken high school-level courses at the school’s famous Timbuktu Academy, and more importantly, he would only be a 10-minute drive from campus.

 

But with all of the local media tracing his first steps on campus, Stewart was an unwilling celebrity. He just wanted to get down to doing his schoolwork and getting to fit in with his classmates. “The attention I got died down pretty quickly,” he said.

 

He traces his love for academics to the dinosaur books his father bought him as a young child. Later, as a toddler, Stewart said he began watching scientific documentaries where his interest in herpetology, entomology and paleontology grew. “I was pretty much interested in all the sciences,” he said.

 

Now, barely an adult, Stewart has set his sights on a career in biological and physical engineering. He spent last summer doing research at North Carolina State University, where he worked on developing self-cleaning, anti-glare glass coated with anti-reflective material and designed to repel oils and water.

 

After continuing his research in a post-grad program next summer, Stewart said he will start graduate school at one of a number of colleges that have shown interest.

 

His mother, Ava Stewart, isn’t surprised by her son’s success.

 

“His father and I could tell early on that he wanted information. There was an intensity in his focus. He started reading when he was three,” she said.

 

Southern University: Polite Stewart, Jr. to receive physics degree at 18 years old

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The Physics of Rembrandt...

Mock-up of Rembrandt's "An old man in military costume" with a portrait painted underneath the final work. Photo: Andrea Sartorius, © J. Paul Getty Trust (free for editorial use if credit is given)

A sophisticated X-ray technology is paving the way to uncover the secrets of a 380-year-old Rembrandt masterpiece. Underneath the Old Man in Military Costume, painted by the Dutch artist in the years 1630-31, previous investigations spotted another portrait which was only faintly distinguishable with all applied technologies. For years, art historians puzzled over the question of who is depicted on the repainted picture. 

Now, an international team of scientists has used a detailed mock-up to test different methods of looking beneath the original painting at DESYs X-ray source DORIS and at the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory (BNL) in the United States, as well as with a mobile X-ray scanner. The results are published as the cover story of the "Journal of Analytical Atomic Spectrometry" (JAAS) of the British Royal Society of Chemistry.

"Our experiments demonstrate a possibility of how to reveal much of the hidden picture," said first author Matthias Alfeld from the University of Antwerp (Belgium). "Compared to other techniques, the X-ray investigation we tested is currently the best method to look underneath the original painting."

Brookhaven National Labs: Mysterious Rembrandt
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The Shoulders of Giants...

 

Franklin McCain: double major, Chemistry/Biology
Ezell Blair Jr. (later known as Jibreel Khazan): Sociology
Joseph Alfred McNeil: Engineering Physics; US Air Force Veteran (I am proudly both)
David Richmond: Business Administration and Accounting

If I have seen further it is by standing on the shoulders of giants. Found in Letters of Sir Isaac Newton

 

Site: February One Documentary
North Carolina Museum of History: The Greensboro Four

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One Photon At A Time...

The single-photon detector is characterized by five convincing factors: 91% detection efficiency; direct integration on chip; counting rates on a Gigahertz scale; high timing resolution and negligible dark counting rates. Source: KIT/CFN.

Ultrafast, efficient, and reliable single-photon detectors are among the most sought-after components in photonics and quantum communication, which have not yet reached maturity for practical application. Physicist Dr. Wolfram Pernice of the Karlsruhe Institute of Technology (KIT), in cooperation with colleagues at Yale University, Boston University, and Moscow State Pedagogical University, achieved the decisive breakthrough by integrating single-photon detectors with nanophotonic chips. The detector combines near-unity detection efficiency with high timing resolution and has a very low error rate. The results have been published by Nature Communications (doi:10.1038/ncomms2307).

 



 


Without reliable detection of single photons, it is impossible to make real use of the latest advances in optical data transmission or quantum computation; it is like having no analog-digital converter in a conventional computer to determine whether the applied voltage stands for 0 or 1. Although a number of different single-photon detector models have been developed over the past few years, thus far, none have provided satisfactory performance. 

Several new ideas and advanced developments went into the prototype developed within the “Integrated Quantum Photonics” project at the DFG Center of Functional Nanostructures (CFN). The new single-photon detector, tested in the telecommunications wavelength range, achieves a previously unattained detection efficiency of 91%.

 

Karlsruhe Institute of Technology:
Quantum Communication: Each Photon Counts, Press Release

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Voila...


An article by Scientific American
Courtesy of Wallentin et al

Here's how to make a powerful solar cell from indium and phosphorus: First, arrange microscopic flecks of gold on a semiconductor background. Using the gold as seeds, grow precisely arranged wires roughly 1.5 micrometers tall out of chemically tweaked compounds of indium and phosphorus. Keep the nanowires in line by etching them clean with hydrochloric acid and confining their diameter to 180 nanometers. (A nanometer is one billionth of a meter.) Exposed to the sun, a solar cell employing such nanowires can turn nearly 14 percent of the incoming light into electricity—a new record that opens up more possibilities for cheap and effective solar power.





According to research published online in Science—and validated at Germany's Fraunhofer Institute for Solar Energy Systems—this novel nanowire configuration delivered nearly as much electricity as more traditional indium phosphide thin-film solar cells even though the nanowires themselves covered only 12 percent of the device's surface. That suggests such nanowire solar cells could prove cheaper—and more powerful—if the process could be industrialized, argues physicist Magnus Borgström of Lund University in Sweden, who led the effort.

 

Nature:
Novel solar photovoltaic cells achieve record efficiency using nanoscale structures, David Biello

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Chilling Antihydrogen...


A method for laser-cooling magnetically trapped antihydrogen atoms to temperatures of about 20 millikelvin has been proposed by a team of researchers from Canada and the US.

 


The team claims that cooling the antihydrogen would make it much more stable and so easier to study in experiments. In particular, it could lead to better spectroscopic analysis of antihydrogen, so that its properties can be compared with those of hydrogen.

 



An artist's concept showing a trapped anithydrogen atom being released after 1000 seconds. The new proposal allows for such trapped antimatter to be laser cooled and then studied. (Courtesy: Chukman So/CERN)

Antihydrogen is an atomic bound state of a positron and antiproton that was first produced at CERN in 1995. Over the past few years, physicists working on the ALPHA experiment at the Geneva lab became the first to capture and store a significant amount of the stuff, holding a total of 309 antihydrogen atoms for 1000 seconds in 2011. In early 2012 the team then showed that it is possible to probe the internal structure of an antihydrogen atom by carrying out the first tentative measurements of the antihydrogen spectrum. By improving such measurements, researchers hope to determine what structural differences, if any, antimatter has compared with ordinary matter.

This, they hope, could eventually explain why the universe currently contains much more matter than antimatter.

 

Physics World: Lasers could chill antihydrogen

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Graphene Photoconductivity...

a) Spatial images of the photocurrent amplitude and phase as a function of gate voltage. The photocurrent in the graphene channel switches sign twice from negative to positive and back to negative. b) Photocurrent amplitude (red) and phase (blue) in the centre of the graphene channel as a function of gate voltage. Courtesy: Nature Photonics

Photodetectors – devices that detect light by converting optical signals into electrical current – are routinely employed in applications such as communications, sensing and imaging. Most light detectors are made of III-V semiconductors like gallium arsenide and they work by absorbing photons to produce electron-hole pairs that then separate and generate an electrical current.

 


Graphene – a sheet of carbon just one atom thick – has a number of unique physical and mechanical properties that make it ideal for detecting light. One important advantage is that electrons move much faster through graphene than through other materials. They behave, in fact, as if they had no mass and travel at 1/300 the speed of light. These particles are called massless Dirac fermions and their behaviour could be exploited in a host of applications, including transistors that are faster than any that exist today.

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