Navigation Links
Team develops new metamaterial device
Date:2/24/2009

CHESTNUT HILL, MA (February 24, 2009) An engineered metamaterial proved it can function as a state-of-the-art device in the complex terahertz range of the electromagnetic spectrum, setting a standard of performance for modulating tiny waves of radiation, according to a team of researchers from Boston College, the Los Alamos and Sandia national laboratories, and Boston University.

An electrical current applied to the metamaterial a hybrid structure of metallic split-ring resonators controlled the phase of a terahertz (THz) beam 30 times faster and with far greater precision than a conventional optical device, the researchers report in the current online edition of the journal Nature Photonics.

The discovery marks a milestone in the use of metamaterials and terahertz radiation, a safe, non-ionizing frequency that is the subject of a growing body of research and viewed as a promising component in applications that include advanced security screening systems and imaging technologies.

"This is a true metamaterial device," Boston College Asst. Prof. of Physics Willie J. Padilla, one of the co-authors of the paper, said. "This highlights the fact that you can make solid state devices at terahertz frequencies with metamaterials."

Constructed on the micron-scale, metamaterials are composites that use unique metallic contours in order to produce responses to light waves, giving each metamaterial its own unique properties beyond the elements of the actual materials in use. Within the past decade, researchers have sought ways to significantly expand the range of material responses to waves of electromagnetic radiation classified by increasing frequency as radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. These metamaterials have demonstrated numerous novel effects that defy accepted electromagnetic principles.

Previously, in systems known as THz time domain spectrometers, the flow of terahertz radiation has been modulated indirectly by optical choppers, mechanical devices that either blocked a laser or allowed it to pass through. This "all or nothing" approach similar to opening and closing the shutter of a camera limits the speed with which one can manipulate terahertz waves since the chopper's mechanical components are too slow, Padilla says.

The metamaterial devised by the research team electronically controlled the flow of terahertz radiation over roughly 70 percent of the frequency band not simply at the points of maximum or minimum frequency.

"We can apply an electronic signal to this device, thus making it opaque to stop terahertz, or transparent to allow terahertz through," Padilla said. "Eventually, you can turn it on and off very quickly and that allows you to modulate the beam at a very specific frequency."

Because the metamaterial device is solid-state, eliminating moving parts, it is 30 times faster than the optical chopper, according to the report, co-authored by Hou-Tong Chen, Abul K. Azad and Antoinette J. Taylor of Los Alamos National Laboratory, Michael J. Cich of Sandia National Laboratories and Richard D. Averitt of Boston University

"The advantage of the metamaterial is you are doing it electronically," Padilla said. "If you want to build a device, the advantage of this is that it is all solid-state and voltage controlled. You have no moving parts. Therefore, you can modulate at very high speeds."

These kinds of controls have been developed for microwave and optical frequencies and led to a number of key breakthroughs, the researchers note. But the technologies have not extended to the terahertz frequency.

Padilla said a solid-state metamaterial device is a critical step toward improved terahertz devices, such as cameras or scanners.

"What we've shown with this metamaterial is that it is now improved to the point where it could be used as a device," Padilla said. "It could be the device you could use to build a terahertz system."


'/>"/>

Contact: Ed Hayward
ed.hayward@bc.edu
617-552-4826
Boston College
Source:Eurekalert

Related biology technology :

1. UCF professor develops vaccine to protect against black plague bioterror attack
2. UCF professor develops vaccine to protect against black plague bioterror attack
3. UC Riverside researcher develops novel method to grow human embryonic stem cells
4. China Sky One Medical, Inc. Develops Nasal Spray for Rheumatic Disease
5. Zounds Hearing Develops and Releases Power BTE Hearing Aid
6. Bionovo Develops a High Throughput LC-MS/MS Method for Simultaneous Quantification of Multiple Bioactive Compounds
7. MIT develops a paper towel for oil spills
8. Bio Career Center Develops New Tool to Assist in Employer/Candidate Match
9. A New Era in Cell Biology: German Company Develops Groundbreaking Alternative to Stem Cell Therapy
10. Team develops energy-efficient microchip
11. NIST develops test method for key micromechanical property
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/27/2016)... June 27, 2016  Liquid Biotech ... funding of a Sponsored Research Agreement with The ... cells (CTCs) from cancer patients.  The funding will ... levels correlate with clinical outcomes in cancer patients ... will then be employed to support the design ...
(Date:6/24/2016)... ... 2016 , ... While the majority of commercial spectrophotometers and fluorometers use the ... models are higher end machines that use the more unconventional z-dimension of 20mm. ... the bottom of the cuvette holder. , FireflySci has developed several Agilent flow ...
(Date:6/23/2016)... , June 23, 2016   Boston ... of novel compounds designed to target cancer stemness ... has been granted Orphan Drug Designation from the ... treatment of gastric cancer, including gastroesophageal junction (GEJ) ... inhibitor designed to inhibit cancer stemness pathways by ...
(Date:6/23/2016)... , ... June 23, 2016 , ... ... YM (Yeast and Mold) microbial test has received AOAC Research Institute approval 061601. ... microbial tests introduced last year,” stated Bob Salter, Vice President of Regulatory and ...
Breaking Biology Technology:
(Date:6/7/2016)... , June 7, 2016  Syngrafii Inc. and ... business relationship that includes integrating Syngrafii,s patented LongPen™ ... project. This collaboration will result in greater convenience ... credit union, while maintaining existing document workflow and ... ...
(Date:6/2/2016)... -- The Department of Transport Management (DOTM) of ... US Dollar project, for the , Supply and ... and IT Infrastructure , to Decatur ... of Identity Management Solutions. Numerous renowned international vendors participated in ... was selected for the most compliant and innovative solution. ...
(Date:6/2/2016)... Perimeter Surveillance & Detection Systems, Biometrics & ... & Other Service  The latest report from ... of the global Border Security market . Visiongain ... billion in 2016. Now: In November 2015 ... and hardware technologies for advanced video surveillance. ...
Breaking Biology News(10 mins):