Researchers at Korea Advanced Institute of Science and Technology have developed a 3D gap-plasmon antenna which can focus light into a few nanometers wide space.
Professors Myung-Ki Kim and Yong-Hee Lee of the Physics Department at KAIST and their research teams developed a 3D gap-plasmon antenna which can focus light into a few nanometers wide space. Their research findings were published in the June 10th issue of Nano Letters.
Focusing light into a point-like space is an active research field as it finds many applications. However, concentrating light into a smaller space than its wavelength is often hindered by diffraction. In order to tackle this problem, many researchers have utilized the plasmonic phenomenon in a metal where light can be confined to a greater extent by overcoming the diffraction limit.
Many researchers focused on developing a two dimensional plasmonic antenna and were able to focus light under 5 nanometers. However, this two dimensional antenna reveals a challenge that the light disperses to the opposite end regardless of how small it was focused. For a solution, a three dimensional structure has to be employed in order to maximize the light intensity.
Adopting the proximal focused-ion-beam milling technology, the KAIST research team developed a three dimensional 4 nanometer wide gap-plasmon antenna. By squeezing the photons into a three dimensional nano space of 4 x 10 x 10 nm3 size, the researchers were able to increase the intensity of light 400,000 times stronger than that of the incident light.
Capitalizing on the enhanced intensity of light within the antenna, they intensified the second-harmonic signal and verified that the light was focused in the nano gap by scanning cathodoluminescence images.
This technology is expected to improve the speed of data transfer and processing up to the level of terahertz (one trillion times per second) and to enlarge the storage volume per unit area on hard disks by 100 times. In addition, high definition images of sub-molecule size can be taken with actual light, instead of using an electron microscope, while it can improve the semiconductor process to a smaller size of few nanometers.
Professor Kim said, “A simple yet genuine idea has shifted the research paradigm from 2D gap-plasmon antennas to 3D antennas. This technology sees numerous applications including in the field of information technology, data storage, image medical science, and semiconductor process.”
The research was sponsored by the National Research Foundation of Korea.
Lan Yoon | ResearchSEA
NASA's Fermi catches gamma-ray flashes from tropical storms
25.04.2017 | NASA/Goddard Space Flight Center
DGIST develops 20 times faster biosensor
24.04.2017 | DGIST (Daegu Gyeongbuk Institute of Science and Technology)
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
25.04.2017 | Physics and Astronomy
25.04.2017 | Materials Sciences
25.04.2017 | Life Sciences