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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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Figure 23 with Figure 22, it is observed that the dips correlate with drops of the total
reflectivity and increases of the total absorption of the absorber/MetaMirror structure.
The MetaMirror approach to infrared energy harvesting is one of the very promising
applications of metamaterials. A number of aspects of MetaMirrors must be investigated
and several important questions must be answered before practical applications can be
pursued. Some of those questions are:
• What is the angular dependence of absorptivity, and can it be made wide-angle as
we have recently demonstrated in Reference 20 for negative-index metamaterials?
• Can absorptivity be made broad-bandwidth by combining localized resonances with
the LR-SPPs? That could be potentially accomplished by using U-shapes with
different geometries, yet spaced in a regular periodic pattern, or by using quasi
periodic arrangements of CM Ms shapes.
• What are the most promising polarization-independent unit cells of CMMs that result
in enhanced absorptivity?
• Is it possible to apply the MetaMirror concept in the visible and contribute to solar
energy harvesting?
As more researchers are investigating energy-harvesting applications of CMMs (or
MetaMirrors), it is believed that these questions will be answered very soon.
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Figure 23. Engineering the Complex Reflectivity Coefficient r2 Defined on the Left Panel Using the
Concept of a MetaMirror. Dips of I r2 I shown in t he right panel correspond to reflection dips (and absorption
peaks) in Figure 2. The physical reason for these dips is the excitation of long-ra nge SPPs on the MetaMirror
surface. Inset: Fabricated MetaMirror.
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