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!
Meteoritic stardust unlocks timing of supernova dust formation
19.01.2018 | Carnegie Institution for Science
Artificial agent designs quantum experiments
19.01.2018 | Universität Innsbruck
On the way to an intelligent laboratory, physicists from Innsbruck and Vienna present an artificial agent that autonomously designs quantum experiments. In initial experiments, the system has independently (re)discovered experimental techniques that are nowadays standard in modern quantum optical laboratories. This shows how machines could play a more creative role in research in the future.
We carry smartphones in our pockets, the streets are dotted with semi-autonomous cars, but in the research laboratory experiments are still being designed by...
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
19.01.2018 | Materials Sciences
19.01.2018 | Health and Medicine
19.01.2018 | Physics and Astronomy