New Physics of Metamaterials

Negative refraction

Negative refraction

Z.Y.Wang
Einstein utilized Lorentz invariance from Maxwell’s equations to modify mechanical laws and establish the special theory of relativity.
Similarly, we may have a different theory if there exists another covariance of Maxwell’s equations. In this paper, we find such a new transformation where Maxwell’s equations are still unchanged.
Consequently, Veselago’s metamaterial and other systems have negative phase velocities without double negative permittivity and permeability can be described by a unified theory.
People are interested in the application of metamaterials and negative phase velocities but do not appreciate the magnitude and significance to the spacetime conception of modern physics and philosophy….
… Read more at http://arxiv.org/ftp/arxiv/papers/1404/1404.5255.pdf

Metamaterials and the mathematical Science of invisibility

Principle of cloaking : (left) A point source radiating in an homogeneous isotropic medium; (middle) A point source radiating in an homogeneous isotropic medium in the  presence of an infinite conducting F-shaped scatterer; (right) A point source radiating in  an homogeneous isotropic medium in the presence of an infinite conducting F-shaped  scatterer surrounded by an invisibility cloak (an anisotropic heterogeneous ring)

Principle of cloaking : (left) A point source radiating in an homogeneous isotropic
medium; (middle) A point source radiating in an homogeneous isotropic medium in the
presence of an infinite conducting F-shaped scatterer; (right) A point source radiating in
an homogeneous isotropic medium in the presence of an infinite conducting F-shaped
scatterer surrounded by an invisibility cloak (an anisotropic heterogeneous ring)

Andre Diatta, Sebastien Guenneau, Andre Nicolet, Frederic Zolla
A review of some recent developments in the field of photonics: cloaking, whereby an object becomes invisible to an observer, and mirages, whereby an object looks like another one (say, of a different shape). Such optical illusions are made possible thanks to the advent of metamaterials, which are new kinds of composites designed using the concept of transformational optics. Theoretical concepts introduced here are illustrated by finite element computations…..
Read more: http://arxiv.org/ftp/arxiv/papers/1212/1212.5408.pdf

Was a metamaterial lurking in the primordial universe?

An all-sky survey of the cosmic microwave background taken by the ESA's Planck space mission. (Courtesy: ESA)

A scientist in the US is arguing that the vacuum should behave as a metamaterial at high magnetic fields. Such magnetic fields were probably present in the early universe, and therefore he suggests that it may be possible to test the prediction by observing the cosmic microwave background (CMB) radiation – a relic of the early universe that can be observed today.
One of 2011’s strangest predictions in physics was the suggestion by Maxim Chernodub of the French National Centre for Scientific Research that, at incredibly high magnetic fields, superconducting states can emerge from the vacuum. This was particularly interesting because one of the main difficulties facing scientists working on traditional superconductivity is preventing superconducting states disappearing in the presence of even moderate magnetic fields….
Read more: physicsworld.com

‘Antimagnet’ joins list of invisibility approaches

The design may lead to shields that protect pacemaker wearers during MRI scans

Researchers have designed a “cloak” that is invisible to magnetic fields both coming in and coming out.

The idea of blocking magnetic fields has been proposed before, but the new design, in the New Journal of Physics, could even hide magnetic materials.

It could thus find application in security or medical contexts, such as those surrounding MRI scans.

The approach uses superconductor layers and the “metamaterials” familiar from recent invisibility cloak research.

Metamaterials are artificially designed materials designed to guide electromagnetic waves – like light or magnetic fields – in a way that natural materials do not.

Much research in recent years has attempted to put metamaterials to work in Harry Potter-style invisibility cloaks that guide light waves around a cloak’s wearer – although experiments have only demonstrated such effects on tiny items, or for a limited range of colours.

But because light and magnetism are two facets of the same physical force, many of the same principles apply for demonstrating a magnetic cloak, as the report’s lead author Alvaro Sanchez explained….. Continue reading ‘Antimagnet’ joins list of invisibility approaches

DNA Origami Revolutionizes Metamaterial Manufacture

Physicists use DNA assembly technique to create a ‘metafluid’ capable of manipulating visible light in new ways

Assembly of DNA origami gold particle helices and principle of CD measurements

Back in 2003, the first metamaterial was designed to bend microwaves in ways that ordinary materials can never achieve. The material was made from c-shaped pieces of metal and wires assembled into a kind of honeycomb structure the size of a table top.

Size in is important. The active components in metamaterials and their repeating structure have to be smaller than the wavelength of light they are designed to influence. So the c-shaped pieces of metal–split ring resonators, as physicists call them–were a few millimetres across, big enough to allow the entire structure to be painstakingly assembled by hand.

But that raised an obvious question: how to build similar devices that work for smaller wavelengths….. Continue reading DNA Origami Revolutionizes Metamaterial Manufacture

Experimental observation of the “end of time event”

Experimental observation of the “end of time event” in a plasmonic hyperbolic metamaterial illuminated with 488 nm light.

Extraordinary rays in a hyperbolic metamaterial behave as particle world lines in a three dimensional (2+1) Minkowski spacetime. We analyze electromagnetic field behavior at the boundaries of this effective spacetime depending on the boundary orientation. If the boundary is perpendicular to the space-like direction in the metamaterial, an effective Rindler horizon may be observed which produces Hawking radiation. On the other hand, if the boundary is perpendicular to the time-likedirection an unusual physics situation is created, which can be called “the end of time”. It appears that in the lossless approximation electromagnetic field diverges at the interface in both situations. Experimental observations of the “end of time” using plasmonic metamaterials confirm this conclusion….Read more: http://arxiv.org/ftp/arxiv/papers/1107/1107.4053.pdf