Documents / Official release
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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slowed down and/or stopped light, the schematic shown in Figure 13 provides some key
ideas. Moreover, the prospect of producing a low-loss negative index material in the
optical domain still remains somewhat distant. Therefore, it may be worthwhile to
examine other approaches to slowing down light that have emerged in the past few
years.
Stopping and/or slowing down light is an old idea originating from the atomic concept of
Electromagnetically Induced Transparency (EIT). The phenomenon has been considered
to be purely quantum mechanical until several groups have demonstrated that it has
some classical analogies (Reference 31). Remarkably, at least one group has
demonstrated in the past year that EIT can be achieved using plasmonic meta materials
(Reference 32). The idea is to create a plasmonic "molecule" consisting of a radiative
element coupled with a subradiant (dark) element. The plasmonic molecule showed
electromagnetic response that closely resembles the electromagnetically induced
transparency in an atomic system. Because of its subwavelength dimension, this
electromagnetically induced transparency-like molecule was shown to be suitable as a
building block to construct a "slow light" plasmonic metamaterial. The specific design of
the plasmonic molecule is shown in Figure 15.
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Figure 16. "Plasmonic Molecule" Exhibiting EIT. Lelt: Radiative element (metal strip) by itself gets strong ly
polarized by the incident EM wave, resulting in weak transmission/strong reflection. Right: Radiative element
coupled to the "dark" element (two strips) . Dark element possesses a non-radiative quadrupole resonance which is
excited by the radiative element and de-polarizes the radiative element. The result: vanishing reflection, high
transmission. Color bar: IEInormalized to the incident laser field at>. = 700 nm. (Reference 32)
This specific plasmonic molecule consists of the "dark state" (two parallel plasmonic
antennas oriented perpendicular to the incident vertical electric field) and the "radiative
state" (single plasmonic antenna oriented parallel to the electric field). The quality
factor of the "dark antenna" state is an order of magnitude higher than that of the
"radiative" antenna. When the "radiative" antenna is spatially separated from the "dark"
antenna (or when the dark antennas are not present at all), all or most of the incident
radiation is reflected from an array of "radiative" antennas whenever the resonance
frequency of the antenna coincides with that of the laser. In th is example, the long
antenna is 128 nm long, and the resonance wavelength is at>-. = 700 nm. The key
effect here is that the resonance of the "dark" antenna should be at the same
wavelength.
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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.