Occupational Medicine staff will administer flu shots from 10 a.m. to 4 p.m. Oct. 7 through Oct. 18 in 205 Technical Administrative Service Facility (TASF). No appointment is necessary. Be sure to bring your ISU ID card or your university ID number to the shot clinic. Please note there is limited parking in front of TASF.
Flu shots will be provided at no cost for the following eligible groups:
- Professional and Scientific
- University Child Care (ISU employees only)
- Miscellaneous affiliate employees enrolled in ISU health plans (ISU Foundation, Iowa State Daily, Greek house directors). Some affiliate organizations will need to pay for their participating employees' vaccinations.
- Retirees on university health plans who are not yet 65
Students, post docs and visiting scholars are not eligible to receive flu shots at the clinic in TASF. These individuals should contact the Thielen Student Health Center, 4-5801, for flu vaccine information.
Employees are encouraged to get vaccinated as soon as possible within the specified October time frame. For more information, call 4-0874.
Could graphene – a one-layer thick sheet of carbon atoms – be the ingredient needed for super-efficient solar harvesting with metamaterials? Or for “light on wire” plasmonic data transmission? In the Aug. 9 issue of Science, Ames Laboratory physicists Costas Soukoulis, Philippe Tassin, and Thomas Koschny discuss the potential and challenges of using graphene in metamaterials and plasmonics in terahertz applications, which operate at frequencies between microwave and infrared waves.
Metamaterials are man-made structures that exhibit properties not possible in natural materials, such as refracting light “backward” or absorbing all the light that hits them.The Ames Lab trio found that graphene may be a good candidate to replace the metals currently used to build metamaterials.
“Graphene is a fascinating and promising material because it’s so thin, is very electronically responsive, and has electronic properties that are easily changed,” said Soukoulis, Ames Laboratory physicist and Iowa State University Distinguished Professor of physics and astronomy. “Our review of the findings shows hurdles to cross before graphene could replace the thin metal films currently used in metamaterials and plasmonics.”
“Graphene offers an advantage over metals because graphene’s properties can be more readily tuned to obtain the electrical response desired for a given application,” said Soukoulis.
Graphene’s tunability may also make it a good candidate for use in plasmonics, where a tiny structure uses light to carry information.
However, Soukoulis, Tassin and Koschny still see challenges. They surveyed both experimental measurements and theoretical simulations about graphene’s properties relevant for terahertz applications. In general, Soukoulis’ team noted that the data indicate a “discrepancy between the experimentally realizable and the theoretically predicted performance.” For instance, experimental data have shown significantly higher electrical losses than has been estimated by theoretical work.
“Overcoming those dissipative losses will be the major obstacle for using graphene in terahertz applications of metamaterials and plasmonics,” said Soukoulis.
Soukoulis, Tassin and Koschny’s work at Ames Laboratory was supported by the U.S. Department of Energy’s Office of Science (funding for the search for better optical materials, properties of metals at optical frequencies, and understanding electrical losses in metamaterials) and the U.S. Office of Naval Research (graphene as conductors for resonant metamaterials). Iowa State University College of Liberal Arts Frances M. Craig Professorship also supports Soukoulis’ efforts.
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