DIA Invisibility Cloaking report: full transcription
// Field Guide
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Get the guide: $8 instant download →Invisibility Cloaking: Theory and Experiments. Ulf Leonhardt, PhD Dr. Habil, FRSE. University of St. Andrews.
This product is one in a series of advanced technology reports produced in FY 2009 under the Defense Intelligence Agency, Defense Warning Office’s Advanced Aerospace Weapon System Applications (AAWSA) Program. Comments or questions pertaining to this document should be addressed to James T. Lacatski, D.Eng., AAWSA Program Manager, Defense Intelligence Agency.
The development of transformation optics and metamaterials had led to the theoretical prediction of invisible dipoles and invisibility cloaks. Since then the principles behind invisibility have been demonstrated in a number of experiments that feature cloaking in some reduced form. Electromagnetic cloaking was first realised for microwaves of one frequency and polarisation. Numerous subsequent electromagnetic experiments achieved carpet cloaking. A carpet cloak does not make things invisible, but makes them appear to be flat.
Conventional cloaking based on Euclidean transformation optics requires that the speed of light should tend to infinity on the inner surface of the cloak. Non-Euclidean cloaking still needed media with superluminal propagation. Since space has to be expanded to make room for the invisible region within the cloak, the implementation of this device will still demand superluminal propagation.
This transcription covers the report’s cover page, authorship, and the core physical principle and constraint drawn from Leonhardt’s directly related published academic work, which forms the technical basis of the classified report itself. The full DIA report additionally includes dedicated sections on camouflage applications and experimental results, available in the full source document linked below.
Document: Invisibility Cloaking: Theory and Experiments. DIA AAWSA Program, FY 2009.
Author: Dr. Ulf Leonhardt, University of St. Andrews.
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