I decided to scour my archive of FOIA documents, along with other military and government resources, and discovered quite a bit of research done outside of AATIP, on the topic of metamaterials and “invisibility cloaking.”\u00a0 Contracts and grants are connected with the U.S. Air Force Research Lab (AFRL), Army Research Office, Department of Defense (DOD), Defense Technical Information Center (DTIC) and the\u00a0European Office of Aerospace R&D.<\/p>\n
You will find a couple of the records below, are from symposiums that make reference to “invisibility cloak” technology as well.<\/p>\n
Document Archive<\/h3>\n
![](\"https:\/\/www.theblackvault.com\/images\/pdf.gif\")
\u00a0OSA Incubators: Science and Applications of Nanolasers; and Subwavelength Photonics, July 2017<\/a>\u00a0[36 Pages, 2.1MB] –\u00a0Science and Applications of Nanolasers and Subwavelength Photonics Incubators were two separate meetings held in Washington, DC on 7-9 and 21-23 September 2016. The two Incubators provided unique and focused experiences and valuable opportunity to discuss advances, challenges and opportunities regarding the niche fields.<\/p>\n\u00a0Constitutive Parameters of Metamaterial Structures Used for Invisible Cloak Realization, October 2013<\/a> [83 Pages, 4.3MB] –\u00a0The realization of structures that do not scatter electromagnetic fields (\u201ccloaking devices\u201d) has been envisioned since the 1960s; recent advances in metamaterial research has shifted cloaking possibilities to this new field through transformation optics, creating a shell which effectively cloaks the space inside the shell by diverting EM radiation around it. The author finds such a cloak unfeasible in practice but investigates a simplified cloak design for one specific polarization of incident plane waves in an effort to improve the scattering properties of the realized cloaks. The proposed procedure attempts to characterize a planar structure, examine its realization using planar metamaterials, and then attempt to curve the metamaterials to obtain the desired geometry. The research proposes to develop this method, estimate parameters of planar multilayer periodic structures, and then estimate parameters of curved multilayer periodic structures. The main realized outcomes of the project are that the investigators proposed a four-step procedure to design metamaterial structures, investigated procedures to extract constitutive parameters of cloaks, showed design examples of structures containing different types of periodic-cell elements, and developed algorithms\/programs for characterizing metamaterial structures including extensions of algorithms which calculate Green\u2019s functions of anisotropic multilayer structures.<\/p>\n