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This Defense Intelligence Reference Document, DIA-08-1004-006, is dated 6 April 2010 and was prepared by the Defense Intelligence Agency's Defense Warning Office. It is one of a series of advanced technology reports produced in FY 2009 under the Advanced Aerospace Weapon System Applications Program. The report reviews electromagnetic and optical metamaterials and their uses in sub-diffraction imaging, component miniaturization, energy harvesting, optical isolators and tunable devices. It concludes that metamaterials remain academic but have great potential for aerospace applications.
From the source: Release of 2026-09-18 Incident: 4/6/10, Las Vegas, Nevada. Released with redactions. This document is a Defense Intelligence Reference Document (DIRD), a technical reference format used by the Defense Intelligence Agency (DIA) to capture baseline knowledge on a specific topic for later analytic use. DIRDs are best understood as reference and synthesis products rather than as original research. It is one of 38 DIRDs produced under the Advanced Aerospace Weapon System Applications Program (AAWSAP) between 2009 and 2011. Because AAWSAP’s scope permitted a broad range of supporting topics, not every DIRD in the series directly concerns aerospace systems or future threat assessment. The following summary reflects the DIRD’s scope and framing at the time of writing and should not be read as implying current validation of the concepts discussed. This DIRD surveys metamaterials, engineered structures designed to control electromagnetic waves in ways ordinary materials cannot, and argues that their main aerospace value lies in unusual optical and microwave properties together with significant component miniaturization. The report reviews possible applications including sub-wavelength imaging, compact waveguides and lasers, energy harvesting, tunable absorbers, nonreciprocal devices, and switchable materials, with particular emphasis on infrared and microwave uses for sensing, power management, and payload efficiency. It notes that many of the most ambitious applications depend on the practical output of a still-nascent field, especially in optical metamaterials, where only limited demonstrations had been achieved and fabrication remained a major constraint. The document presents metamaterials as a promising advanced materials field with credible niche applications and broader long-term potential.
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The electric response of such (or similar) metamaterial is given by
(2)
where w R 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 (1PM) (References
3, 4) and Epsilon- Near-Zero (ENZ) metamaterials (Reference 5) have recently emerged
and found some exciting applications t hat will be reviewed below. IPMs ca n be used as
ultra-compact spatia l 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 rad iation (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).
CE1 CE4
CE2 CE5
CE3 CE6
Figure 3. Geometry of Original Planar Metamaterial Unit Cells (OE1-0E6) and Their Complements
(CE1-CE6}. The polarization of normally incident electromagnetic rad iation is configured as shown in OEl
and CEl for the original and complementary metamaterials, respectively. (Reference 9)
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Official release, from the pursue collection. The PDF is mirrored here; the original link is above. 38 pages are in the text index: search them above, or from the library's search.