Documents / Report
This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 6 April 2010, reviews electromagnetic and optical metamaterials for aerospace use. It was produced in FY 2009 under the Advanced Aerospace Weapon System Applications (AAWSA) Program. The report covers super-lenses and hyper-lenses for imaging objects smaller than the diffraction limit, slowing light to shrink components, energy-harvesting absorbers, and one-way chiral devices. It concludes that metamaterials matter for aerospace because they allow smaller, lighter components.
“Nature”8 pages
UNCLASSIFIED,':,'P8A 8PPlll11ik ldOI 8ttkl( The electric response of such (or similar) metamaterial is given by ai &(Ill)= f - l l' . or-m; +10Jy (2) where ma is the resonant frequency and r is the loss coefficient. Negative index metamaterials are by no means the only potentially useful metamedia. Several new concepts such as Indefinite Permittivity Metamaterials (IPM) (References 3, 4) and Epsilon-Near-Zero (ENZ) metamaterials (Reference 5) have recently emerged and found some exciting applications that will be reviewed below. IPMs can be used as ultra-compact spatial filters (both high-pass and low-pass) whereas ENR metamaterials can be·used for making sub-wavelength waveguides capable of coupling close to 100 percent of the incident radiation (Reference 8), as well as directing it around tight bends with negligible bending losses. Yet another class of planar metamaterials, complementary metamaterials (CMMs), has recently emerged (Reference 7). Instead of using metallic structures deposited on a substrate (left panel of Figure 3), CMMs consist of slits in the continuous metal screen (right panel of Figure 3). The shape of the slits coincides with that of the materials themselves. Such complementary metamaterials have been recently used for making epsilon-near zero waveguides (Reference 8). CE4 CE5 CE3 CE6 Figure 3. Geometry of Orlglnal Planar Metamaterlal Unit Cells (OE1-0E6) and Their Complements (CE1-CE6). The polarization of normally Incident electromagnetlc radiation ls configured as shown ln OEl and CEl for the original and complementary metamaterials, respectively, (Reference 9) 3 UNCLASSIFIED/sUi8R: 8PPIIJl•t tJ91! 81\Ei
Not linked to a story yet.
Report, from the dia collection. The PDF is mirrored here; the original link is under it. 27 pages are in the text index: search them above, or from the library's search.