A research team in South Korea has developed a technology that can manipulate a polarized light in broadband operation with the use of a metamaterial.
Professor Bumki Min from the Department of Mechanical Engineering at Korea Advanced Institute of Science and Technology (KAIST) has led the research and it is expected that this technology will lead to a development of broadband optical devices that can be applied to broadband communication and display.
When an object or its structure is analyzed by using a polarized light such as a laser, the results are generally affected by the polarization state of the light. Therefore, in an optics laboratory, the light is polarized with various methods.
In such cases, wave plates or photoactive materials are usually implemented. However, the performance of these devices are vastly dependent on the wavelength, and so they are not suitable to be used as a polarizer especially in broadband.
There were many attempts to make artificial materials that are very photoactive by using matematerials which have a strong resonance. Nonetheless, because the materials had an unavoidable dispersion in the resonance frequency, they were not adequate for a broadband operation.
Professor Min’s research team arranged and connected helical metamaterials that are smaller than the wavelength of a light. They theoretically and experimentally verified that a polarized light can be constantly rotated regardless of the wavelength by super thin materials that has thickness less than one-tenth of the wavelength of the light. The experiment to confirm the theory was done in the microwave band.
Broadband polarized rotational 3D metamaterials were found to be rotating the polarized microwave within the range of 0.1 GHz to 40GHz by 45 degrees regardless of its frequency. Such nondispersive property is quite unnatural because it is difficult to find a material that does not change in a wide band.
Along with this, the research team materialized the broadband nondispersive polarized rotational property by designing the metamaterial in a way that it has chirality, which determines the number of rotation proportional to the wavelength.
Professor Min said, “As the technology is able to manipulate ultrathin polarization of light in broadband, it will lead to the creation of ultra-shallow broadband optical devices.”
Sponsored by the Ministry of Science, ICT and Future Planning and the National Research Foundation of Korea, this research was led by a PhD candidate, Hyun-Sung Park under the guidance of Professor Min. The research finding was published online in the November 17th issue of Nature Communications.
Lan Yoon | ResearchSEA
NASA CubeSat to test miniaturized weather satellite technology
10.11.2017 | NASA/Goddard Space Flight Center
New approach uses light instead of robots to assemble electronic components
08.11.2017 | The Optical Society
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
20.11.2017 | Earth Sciences
20.11.2017 | Earth Sciences
20.11.2017 | Life Sciences