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

, and which exhibits optical properties distinctly different from the bulk material, is called a metamaterial," says Wang. "So we have not only made the first studies of light and plasmon coupling in graphene, we've also created a prototype for future graphene-based metamaterials in the terahertz range."

The team reports their research in Nature Nanotechnology, available in advanced online publication.

How to push the plasmons

In two-dimensional graphene, electrons have a tiny rest mass and respond quickly to electric fields. A plasmon describes the collective oscillation of many electrons, and its frequency depends on how rapidly waves in this electron sea slosh back and forth between the edges of a graphene microribbon. When light of the same frequency is applied, the result is "resonant excitation," a marked increase in the strength of the oscillation and simultaneous strong absorption of the light at that frequency. Since the frequency of the oscillations is determined by the width of the ribbons, varying their width can tune the system to absorb different frequencies of light.

The strength of the light-plasmon coupling can also be affected by the concentration of charge carriers electrons and their positively charged counterparts, holes. One remarkable characteristic of graphene is that the concentration of its charge carriers can easily be increased or decreased simply by applying a strong electric field so-called electrostatic doping.

The Berkeley device incorporates both these methods for tuning the response to terahertz light. Microribbon arrays were made by depositing an atom-thick layer of carbon on a sheet of copper, then transferring the graphene layer to a silicon-oxide substrate and etching ribbon patterns into it. An ion gel with contact points for varying the voltage was placed on top of the graphene.

The gated graphene microarray was illuminated with terahertz rad
'/>"/>

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:12/17/2014)... (PRWEB) December 17, 2014 Gene ... that it has entered into a technology access ... (ADM) to apply DNA2.0’s proprietary protein engineering technology, ... process. , “We are extremely excited that the ... platform. This proprietary bioengineering technology has now ...
(Date:12/17/2014)... SOUTH SAN FRANCISCO, Calif. , Dec. 17, ... positive results of a Phase 2 study evaluating ... for the treatment of patients with severe, chronic ... the current standard of care, including topical steroids ... endpoint was percent change in Visual Analog Scale ...
(Date:12/15/2014)...  GlassesOff Inc. (OTCBB: GLSO) announced today the appointment ... director of the Company,s Board of Directors. ... its CEO until its acquisition by Stanley Black ... Recognized as the inventor of the first Wi-Fi-based Active ... -based RFID solutions focused on improving operational efficiency, safety ...
(Date:12/13/2014)... (PRWEB) December 12, 2014 Clarassance, a ... announced its new name: Therabron Therapeutics , Inc. ... and bronchioles (a type of structure in the lungs ... company’s mission to develop novel protein therapeutics for the ... directors decided to change the name to mark the ...
Breaking Biology Technology:ADM and DNA2.0 Enter Into Protein Engineering Technology Access and Service Agreement 2Velocity Pharmaceutical Development, LLC and Tigercat Pharma, Inc. Announce Phase 2 Results for VPD-737 in Patients With Chronic Pruritus 2Velocity Pharmaceutical Development, LLC and Tigercat Pharma, Inc. Announce Phase 2 Results for VPD-737 in Patients With Chronic Pruritus 3Velocity Pharmaceutical Development, LLC and Tigercat Pharma, Inc. Announce Phase 2 Results for VPD-737 in Patients With Chronic Pruritus 4AeroScout Founder Joins GlassesOff's Board of Directors 2AeroScout Founder Joins GlassesOff's Board of Directors 3Maryland-based Biotech Company's Path Forward in Treating Respiratory Diseases Sparks Name Change 2
... Aug. 22 Biodel, Inc. (Nasdaq:,BIOD) today ... to its,Scientific Advisory Board (SAB). Dr. ... of Research,and Development at Kos Pharmaceuticals, where ... Kos was acquired by Abbott Laboratories. Dr.,Rosskamp,s ...
... 22 Biopure Corporation,(Nasdaq: BPUR ) announced ... possible joint venture. The possibility of such a ... the Malaysian national news,agency Bernama in early July. ... Malaysia, Biopure and officials,representing public and private interests ...
... Patients, ... Aug. 22 Today, a new grassroots,ballot initiative was launched ... without involving human cloning. Tony Perkins, the President of ... Cures Without Cloning. "I applaud the new Missouri initiative ...
Cached Biology Technology:Ralf Rosskamp, M.D. Joins Biodel's Scientific Advisory Board 2Ralf Rosskamp, M.D. Joins Biodel's Scientific Advisory Board 3Biopure Gives Update on Malaysia Joint Venture Discussions 2Biopure Gives Update on Malaysia Joint Venture Discussions 3
(Date:12/5/2014)... 4, 2014 Increased emphasis on product ... new testing and inspection technologies. The convergence of ... a range of innovative test solutions. This trend ... Y, which is generally more inclined towards communication, ... development strategies of test equipment vendors will cater ...
(Date:11/21/2014)... DALLAS , November 18, 2014 ... Security Systems Market by Systems (Video, RFID, Access Control, ... (SEZ, Factories, Hotels, Banks, Government), Component Service Geography - ... Security Systems Market is projected to be around $25 ... Billion by 2020, growing at a CAGR of 8.69%. ...
(Date:11/18/2014)... Nov. 18, 2014  The Secure Identity & ... today jointly announce the formation of The Airport ... its Identity and Biometric Entry and Exit ... received official support from BORDERPOL, the international non-profit ... and provide expertise regarding border security, traveler and ...
Breaking Biology News(10 mins):Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 2Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 3Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 4Industrial Security Systems Market Worth $38 Billion by 2020 2Industrial Security Systems Market Worth $38 Billion by 2020 3Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 2Identity Management, Document Authentication and Biometric Companies Form "The Airport Entry and Exit Working Group", Releasing the Framework to Help Guide the Department of Homeland Security and Congress Towards Solutions 3
... the first farmers worldwide to plant genetically modified (GM) ... reaped for several years by saving on pesticides have ... Cornell University researchers at the American Agricultural Economics Association ... 25), is that other pests are now attacking the ...
... a recent study, genetically modified cassava plants produced roots ... normal cassava roots. , The findings could help ease ... the cassava plant (Manihot esculenta) as a primary food ... a professor of plant cellular and molecular biology at ...
... molecule that plays a key role in establishing the ... brain. , QBI neural migration laboratory head Associate ... clues regarding development of the corpus callosum, the main ... and right hemispheres of the adult brain. , ...
Cached Biology News:Bt cotton in China fails to reap profit after seven years 2Super-sized cassava plants may help fight hunger in Africa 2
MMP-1/8 (H-300)...
Gastric Carcinoma Marker [BY-1 (3H11)]...
Mouse VEGF R1/Flt-1 Phycoerythrin MAb (Clone 141522) Keywords: Receptor Tyrosine Kinase, RTK, VEGFR1, VEGF Receptor 1 Protein Family: Receptor Tyrosine Kinases, VEGF/PDGF Family...
Mouse VEGF R1/Flt-1 Allophycocyanin MAb (Clone 141522) Keywords: Receptor Tyrosine Kinase, RTK, VEGFR1, VEGF Receptor 1 Protein Family: Receptor Tyrosine Kinases, VEGF/PDGF Family...
Biology Products: