Novel "sensor" developed by engineers in the Meta Group is more efficient, versatile, and cheaper for potential use in such applications as airport security scanners, and collision avoidance systems for aircraft cars or maritime vessels.
New metamaterial developed by the Meta Group has three major components - a thin layer of gold film coated with a nano-thin layer of an insulator, topped off with a dusting of millions of self-assembled nanocubes.
Figure 1: Simulations of the fabricated cloak design
Simulations of the fabricated cloak design. (a) 3D representation of the fabricated cloak. The cloak was designed to circumscribe a cylinder of radius R=7.5 cm. (b) 3D Finite-Element Simulation of an electromagnetic wave incident from the left on the cloak. The dashed line indicates the extent of the taper beyond the edge of the metamaterial region.
(a) A photograph of the full cloak. (b) A photograph of an internal material interface. The labelled arrows depict the orientation of the local coordinate system. The corrugations run along x, provding an effective response in that direction. Each strip has been shifted along x so that there is no discontinuity at the interior boundaries of the cloak. (c) A photograph of the material with overlayed arrows depicting the in-plane lattice vectors for the metamaterial unit cell. The vectors are twice the length of the lattice vectors to aid visibility.
(left, inset) A diagram depicting the MM unit cell. The listed dimensions are give in millimeters. The line width and separation between metalizations is 250 μm. The SRR is mirrored in the back of each unit cell which suppresses the inherent bi-anisotropy of the SRR in this configuration. (right, inset) a plot of the retrieved material parameters as a function of frequency in the vicinity of 10 GHz (vertical dashed line).
Figure 4: Measured Electric field data for free space, the cloak and a copper cylinder at the optimum cloaking frequency of 10.2 GHz
(a),(b), and (c) depict the absolute value of the field in decibels for free space, the cloak and the cylinder, respectively. (d), (e), and (f) depict an instanteneous snapshot of the measured fields. The scaling on the top row is in dB, normalized to the maximum measured field. The scaling on the bottom row is linear and normalized to the maximum and minimum values of the instantaneous field. The scaling is given by the colorbars on the top and bottom of the figure for the field amplitude and instantaneous field, respectively. Animations of the instantaneous fields of the cloak and cylinder are availabe online as supplementary videos one and two, respectively.
This figure depicts the expected behavior of the cloak based on computational simulations. The diamond-shaped cloak is outlined with solid black lines. Any object placed in the central green region is rendered invisible. The color map represents an incident electromagnetic wave from the left. The cloaking material splits the incident wave, guides it around the object, and recombines it on the right. Since the electromagnetic wave does not interact with the cloaked region, any item placed in his region would be hidden from observers on the left or right.
Lead Author Cristian Ciraci's article "Probing the Ultimate Limits of Plasmonic Enhancement" makes the cover of the September issue of SCIENCE Magazine. CMIP researchers collaborated with Imperial College, London.