Navigation Links
A whole new light on graphene metamaterials
Date:9/4/2011

Long-wavelength terahertz light is invisible it's at the farthest end of the far infrared but it's useful for everything from detecting explosives at the airport to designing drugs to diagnosing skin cancer. Now, for the first time, scientists at the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California at Berkeley have demonstrated a microscale device made of graphene the remarkable form of carbon that's only one atom thick whose strong response to light at terahertz frequencies can be tuned with exquisite precision.

"The heart of our device is an array made of graphene ribbons only millionths of a meter wide," says Feng Wang of Berkeley Lab's Materials Sciences Division, who is also an assistant professor of physics at UC Berkeley, and who led the research team. "By varying the width of the ribbons and the concentration of charge carriers in them, we can control the collective oscillations of electrons in the microribbons."

The name for such collective oscillations of electrons is "plasmons," a word that sounds abstruse but describes effects as familiar as the glowing colors in stained-glass windows.

"Plasmons in high-frequency visible light happen in three-dimensional metal nanostructures," Wang says. The colors of medieval stained glass, for example, result from oscillating collections of electrons on the surfaces of nanoparticles of gold, copper, and other metals, and depend on their size and shape. "But graphene is only one atom thick, and its electrons move in only two dimensions. In 2D systems, plasmons occur at much lower frequencies."

The wavelength of terahertz radiation is measured in hundreds of micrometers (millionths of a meter), yet the width of the graphene ribbons in the experimental device is only one to four micrometers each.

"A material that consists of structures with dimensions much smaller than the relevant wavelength
'/>"/>

Contact: Paul Preuss
paul_preuss@lbl.gov
510-486-6249
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Inc. Magazine Names Senior Whole Health the Number One Fastest-Growing Private Company in US
2. Sigma-Aldrich Releases WTA2, a Transplex Whole Transcriptome Amplification Technology for Degraded RNA Samples
3. Transgenomic Awarded SBIR Grant to Support Development of SURVEYOR(R) Endonuclease Adaptor-ligated Libraries (SEAL) for Determining Whole Genome Sequence Variation
4. BioNanomatrixs Revolutionary Whole Genome Analysis Platform Named to MIT Technology Reviews Annual 10 Emerging Technologies List
5. Sigma-Aldrich Introduces MISSION(R) LentiPlex(TM) Pooled shRNA Libraries to Enable Rapid Whole Genome Screening in Primary Cells, Stem Cells or Tumor Cells
6. Box maker, Wildcat Wholesale, Makes Cryogenic Freezer Storage Boxes Affordable By Selling Directly To Labs
7. CutisPharma, Inc. Receives Verified Accreditation for Wholesale Distributors from the National Association of Boards of Pharmacy for Woburn Facility
8. Rx100 Rescues Life if Administered Up to 72 Hours After Exposure to Lethal, Whole-Body Radiation!
9. Stimulus Grant To Fund Whole-Genome Sequencing In Children With Autism
10. Sanaria Inc. Receives Multi-Year U.S. NIH Phase II Small Business Innovation Research Grant to Develop a Genetically Attenuated Whole Parasite Malaria Vaccine
11. The European HEALTHGRAIN consortium developed a definition for whole grain
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
A whole new light on graphene metamaterials
(Date:9/22/2014)... DUBLIN , Sept. 22, 2014 ... the "Global and Chinese Microcrystalline Cellulose Industry Report ... The Global and Chinese Microcrystalline Cellulose Industry Report 2014 ... state of the global microcrystalline cellulose industry with a ... provides a basic overview of the industry including definitions, ...
(Date:9/22/2014)... (Nasdaq: NEOG ) announced today that net ... year, which ended Aug. 31, was $8,883,000 — a ... the first quarter of last year. Adjusted for a ... share in the current quarter were $0.24, compared to ... increased 15% to $67,599,000, from the previous year,s first ...
(Date:9/22/2014)... , September 22, 2014 ... on a mixed note as the Dow Jones Industrial ... Composite closed at 4,579.79, down 0.30%. The S&P 500 ... trading session, six out of ten sectors finished on ... Index ended the day at 751.48, up 0.10%, with ...
(Date:9/22/2014)... BETHESDA, Md. , Sept. 22, 2014  Spherix Incorporated ... fostering and monetization of intellectual property, today announced that the ... patent to the Company in the month of September that ... The issued patent is: USRE45,121 , ... 2014 , Filing date: Dec 27, 2012 ...
Breaking Biology Technology:Global and Chinese Microcrystalline Cellulose Industry Report 2014 2Neogen reports 13% net income increase 2Neogen reports 13% net income increase 3Neogen reports 13% net income increase 4Neogen reports 13% net income increase 5Neogen reports 13% net income increase 6Neogen reports 13% net income increase 7Stock Updates on Biotech Industry - Array BioPharma, Enzon Pharma, Alkermes, Amarin, and Synergy Pharma 2Stock Updates on Biotech Industry - Array BioPharma, Enzon Pharma, Alkermes, Amarin, and Synergy Pharma 3Stock Updates on Biotech Industry - Array BioPharma, Enzon Pharma, Alkermes, Amarin, and Synergy Pharma 4Stock Updates on Biotech Industry - Array BioPharma, Enzon Pharma, Alkermes, Amarin, and Synergy Pharma 5Spherix Notified by United States Patent & Trademark Office of New Standard Essential Patent Issued to Spherix 2Spherix Notified by United States Patent & Trademark Office of New Standard Essential Patent Issued to Spherix 3
... featured your top picks of 2005 stories based on readership ... stories you may have missed. , ,If you don't receive ... You'll be e-mailed all our new stories, twice a week, ... subscription here. , ,Next week well resume our normal ...
... death sentence. , ,Of the approximately 12,000 people who are ... within a year, and the rest within 3 years. The ... to remove the tumor and radiation treatment with the maximum ... low quality of life. Because of this, researchers are racing ...
... While the University of Wisconsin-Madison continues to make ... cultures announced over the weekend, things aren't going so ... , ,Hwang Woo-suk, a South Korean stem-cell researcher, ... accusations surfaced that he fabricated stem-cell research results. , ...
Cached Biology Technology:Radiology advance points way to non-invasive brain-cancer treatment 2Stem-cell controversies slow progress 2
(Date:9/19/2014)... from several Harvard University labs in collaboration with ... researchers with the intellectual raw materials needed to ... flexible materials. , With the advent of low-cost ... manufacturing technology, soft robotics is emerging as an ... rigid robot design, but working with pliable materials, ...
(Date:9/19/2014)... Conn. , Sept. 19, 2014 Nxt-ID, Inc. (Nasdaq: ... biometric authentication company focused on the growing m-commerce market, updates the ... world champion in the lightweight and light middleweight weight classes, ... Yesterday it was announced that Game of Thrones actor ... Married with Children star Katey Sagal have ...
(Date:9/18/2014)... moon of Uranus, is one of the most visually ... its relatively small size, Miranda appears to have experienced ... formation of at least three remarkable and unique surface ... coronae are visible in Miranda,s southern hemisphere, and each ... the largest, has ridges and troughs with up to ...
Breaking Biology News(10 mins):Soft robotics 'toolkit' features everything a robot-maker needs 2NXT-ID's Vinny Paz Celebrity Ad Wocket Update: Katey Sagal and Ciaran Hinds Attached to His Upcoming Movie 2NXT-ID's Vinny Paz Celebrity Ad Wocket Update: Katey Sagal and Ciaran Hinds Attached to His Upcoming Movie 3Miranda: An icy moon deformed by tidal heating 2Miranda: An icy moon deformed by tidal heating 3Miranda: An icy moon deformed by tidal heating 4Miranda: An icy moon deformed by tidal heating 5Miranda: An icy moon deformed by tidal heating 6Miranda: An icy moon deformed by tidal heating 7
... announced a $20,000 grant from Orvis Company, Inc. that will ... along the "Path of the Pronghorn." For more ... km) migration of pronghorn along the path between wintering grounds ... Grand Teton National Park (GTNP). This led to collaboration with ...
... A mutual curiosity about patterns of growth and development in ... together. Animal scientists Rod Johnson and Ryan Dilger have developed ... use to answer important questions about human brain development. ... from the neonatal period to sexual maturity," said Johnson. ...
... human papillomavirus (HPV) vaccine series across both genders continue ... introduction, suggesting that better patient education and increased public ... from the University of Texas Medical Branch (UTMB). ... of three separate studies published in Cancer, Human ...
Cached Biology News:More good news for pronghorn 2Pig brain models provide insights into human cognitive development 2HPV vaccine trends point to failures in patient education, vaccine programs 2
... Sequencer 20 System revolutionizes DNA sequencing, delivering ... The Genome Sequencer 20 System includes: ... and consumables for library construction, amplification, and ... de novo assembly The ...
... Companys Molecular Imaging Systems group announces ... 4000 Digital Imaging Systems, featuring high ... comprehensive fluorescence, luminescence, radiographic and chromogenic ... pixel CCD and 10x optical zoom ...
... been demonstrated that oxidative stress is involved ... Oxidative stress is the condition in which ... antioxidants exist leading to the damage of ... oxidative stress is through several antioxidant systems4 ...
Compound(s) tested through a broad panel of 38 ligand binding and enzyme assays targeting the Central Nervous System. Used to determine selectivity and potential Neurological liabilities of compound...
Biology Products: