A metamaterial is a structure engineered from a variety of substances that, when put together, yield optical properties that do not exist in nature. In this experiment, the metamaterial in use is a hybrid device made of split ring resonators (SRRs) – gold rings with a chunk taken out of one side – over a thin layer of vanadium dioxide (VO2).
By applying a pulse of electricity to this SRR-VO2 hybrid, the physicists can create a temperature gradient along the device that selectively changes the way the material interacts with light – changing the light's speed and direction, for example, or how much light is reflected or absorbed at each point along the device. The material even "remembers" these changes after the voltage is removed.
In a paper published in the AIP's Applied Physics Letters, the UCSD team – in collaboration with researchers from Duke University in Durham, N.C., and the Electronics and Telecommunications Research Institute (ETRI) in South Korea – applied this gradient-producing principle to show that it's possible to modify the way that light interacts with a metamaterial on the order of a single wavelength for 1-terahertz-frequency radiation. Being able to tune metamaterial devices at this level of precision – repeatedly, as required, and after the metamaterial has been fabricated – opens the door to new techniques, including the ability to manufacture Gradient Index of Refraction (GRIN) devices, that can be used for a variety of imaging and communication technologies.
Article: "Reconfigurable Gradient Index Using VO2 Memory Metamaterials" is published in Applied Physics Letters.
Authors: M.D. Goldflam (1), T. Driscoll (1, 2), B. Chapler (1), O. Khatib (1), N. Marie Jokerst (2), S. Palit (2), D.R. Smith (2), Bong-jun Kim (3), Gi-wan Seo (4), Hyun-Tak Kim (3, 4), M. Di Ventra (1), and D.N. Basov (1).(1) University of California, San Diego
Jennifer Lauren Lee | EurekAlert!
Electrocatalysis can advance green transition
23.01.2017 | Technical University of Denmark
Quantum optical sensor for the first time tested in space – with a laser system from Berlin
23.01.2017 | Ferdinand-Braun-Institut Leibniz-Institut für Höchstfrequenztechnik
For the first time ever, a cloud of ultra-cold atoms has been successfully created in space on board of a sounding rocket. The MAIUS mission demonstrates that quantum optical sensors can be operated even in harsh environments like space – a prerequi-site for finding answers to the most challenging questions of fundamental physics and an important innovation driver for everyday applications.
According to Albert Einstein's Equivalence Principle, all bodies are accelerated at the same rate by the Earth's gravity, regardless of their properties. This...
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
23.01.2017 | Health and Medicine
23.01.2017 | Physics and Astronomy
23.01.2017 | Process Engineering