Many researchers have tried to transmit optical signals through SPPs for application to photonic integrated circuits. However, optical frequency signal transmission has not been examined as yet.
Now, Mitsuo Fukuda and his group have developed a transmission technique and a SPP detector and demonstrated the feasibility of optical frequency signal transmission via SPPs.
The SPP detector was a Au/silicon Schottky-junction diode, and free electrons excited by SPPs within the Au-metal cross over the junction, thereby generating a photocurrent. Here the detectable wavelength range of light is determined by the height of Schottky barrier.
The waveguide of SPPs was fabricated using a thin Au-film deposited onto a silica substrate, and optical heterodyne detection technique was employed to detect optical frequency signal from SPPs.
The Schottky-junction diode detects SPPs corresponding to light even in the 1550-nm-wavelength band, in contrast to conventional silicon photodetectors which use interband electron transition, and cannot detect light of wavelengths of more than 1000 nm. The SPPs converted from 1550-nm-wavelength coherent light carry the optical frequency signal along the surface of Au-film without any coherence degradation.
This device and technique could find applications to nano-scale photonic integrated circuits for processing large amounts of information at high speeds.
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 | Life Sciences
19.01.2018 | Life Sciences
19.01.2018 | Physics and Astronomy