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This Defense Intelligence Reference Document, dated 2 March 2010 and produced by the Defense Intelligence Agency under its Advanced Aerospace Weapon System Applications (AAWSA) Program, is a technical survey of invisibility. It covers camouflage, including stealth aircraft and optical camouflage, then transparency, cloaking by coordinate transformation, metamaterials and non-Euclidean broadband cloaking. It concludes that perfect cloaking is impossible but imperfect microwave cloaks are within reach of present technology. Whether cloaking will work at visible wavelengths remains unclear.
UNCLASSIFIED/ i'F&lil: 8FFI1il.t.k Wfili &,.kY Contents Introduction ............................................................................................................v Camouflage ............................................................................................................ 1 Transparency ......................................................................................................... 3 Cloaking ................................................................................................................. s Metamaterials ........................................................................................................ 9 Optical Metamaterials .......................................................................................... 11 Fundamental Problem .......................................................................................... 15 Curved Space ....................................................................................................... 17 Broadband Invisibility .......................................................................................... 19 Implementation ................................................................................................... 20 Optical Cloaking ................................................................................................... 22 Summary .............................................................................................................. 23 References ........................................................................................................... 23 Figures Figure 1. B2 Stealth Bomber .................................................................................. 1 Figure 2. Optical Camouflage ................................................................................. 2 Figure 3. The Secret Optical Camouflage ................................................................ 2 Figure 4. H. G. Wells's The Invisible Man: Invisibility by Transparency .................. 3 Figure 5. Complementary Media Invisibility Cloak .................................................. 4 Figure 6. Cloaking Shell .......................................................................................... 5 Figure 7. The Invisible Woman ............................................................................... 6 Figure 8. Fermat's Principle ................................................................................... 7 Figure 9. An Optical Material Deforms the Coordinates of Space ............................ 8 Figure 10. Light Waves at Cloaking Device ............................................................. g Figure 11. Cloaking Device for Microwaves .......................................................... 10 iii UNCLASSIFIED/;«F&lil: 8FFIIIAk W&li 8Hk¥
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Report, from the dia collection. The PDF is mirrored here; the original link is above. 29 pages are in the text index: search them above, or from the library's search.