Accession Number : ADA613691


Title :   Structural Composites With Tuned EM Chirality


Descriptive Note : Final performance rept. 1 Aug 2009-30 Sep 2014


Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF MECHANICAL AND AEROSPACE ENGINEERING


Personal Author(s) : Nemat-Nasser, Siavouche


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA613691


Report Date : 23 Dec 2014


Pagination or Media Count : 11


Abstract : he AFOSR project on structural composites with tunable chiral elements has produced some impressive results in the past few years. These include (1) electronically tunable overall chiral composites, (2) mechanically tunable chiral composites, (3) flat lenses with soft hyperbolic focusing due to indefinite overall permittivity, (4) a tunable flat lens based on chiral elements with adjustable focal spot based on applied mechanical deformation, and (5) a three-phase periodic composite was created that demonstrates positive and negative refraction depending on the input frequency and angle of incidence. A MATLAB code directly computes the group velocity and pass bands for a given set of wave vectors and generates an intuitive plot for quick, but thorough, analysis.


Descriptors :   *COMPOSITE STRUCTURES , COMPOSITE MATERIALS , DEFORMATION , GROUP VELOCITY , HYPERBOLAS , METAMATERIALS


Subject Categories : Structural Engineering and Building Technology


Distribution Statement : APPROVED FOR PUBLIC RELEASE