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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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Because the exploited resonance has a quadrupole nature, it is slightly red-shifted. For
that reason, the length of the "dark" antenna is 100 nm. When the two antennas are
brought together, the radiative antenna polarizes the dark antenna, which, in turn,
depolarizes the radiative antenna. As a result, the dipole moment of the coupled system
is drastically reduced, the reflection drops and transmission increases to almost 100
percent (limited only by losses). Most of the energy is now stored inside the non
radiative (dark) antenna.
If multiple layers of dark/bright antennas are employed as shown in Figure 16, then
one can achieve one of the most important manifestations of EIT; "slow" light. Slow
light can have many interesting technological applications because (a) slow light is easy
to manipulate by changing the structure's parameters (as described in the section on
tunable metamaterials), and (b) slow light has a high field intensity (enhanced by the
ratio of the free-space propagation speed to the slow propagation speed), therefore, all
nonlinear processes are enhanced for slow light. Such nonlinear processes may include
harmonics generation, optical diode action (see the section on non-reciprocal optical
elements), and many others.
(a)
Figure 17. True Multi-Layer Metamaterial With a Unit Cell Shown in Figure 15: radiative antenna (single
metal strip) coupled to a dark antenna (two perpend icu lar metal bars). Such metamaterial exhibits "slow" light
propagation along the incidence direction (slowed down by a factor 30 or more). (Reference 32)
It is important to rea lize that the geometry suggested in Reference 32 is not unique.
For example, the dark and radiative antennas need not reside in the same plane. Nor is
the effect of EIT (and the related phenomenon of slow light) limited to the optical
domain. Both infrared and microwave-range designs have started emerging. These
frequency domains are likely to be of greater use for advanced aerospace platforms
than the visible range targeted by most studies.
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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.