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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.
“red lights”6 pages
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 under it. 29 pages are in the text index: search them above, or from the library's search.