Optical frequency signal propagation and detection via surface plasmon polaritons
Surface plasmon polaritons (SPPs) are waves that propagate along the surface of a conductor and collective oscillation of electrons coupled with optical fields on the nanometer scale, beyond the diffraction limit of propagating light waves.
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.
E Authors: Takuma Aihara and Mitsuo fukuda.
E Title of original paper: Transmission properties of surface-plasmon-polariton coherence.
E Journal, volume, pages and year: Applied Physics Letters 100, 213115 (2012).
E Digital Object Identifier (DOI): 10.1063/1.4723715
E Affiliations: Department of Electrical & Electronic information Engineering.
E Department website: www.photon.ee.tut.ac.jp
| Toyohashi University of Technolo
The most recent press releases about innovation >>>
Die letzten 5 Focus-News des innovations-reports im Überblick:
Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.
Microwaves, heat radiation, light and X-radiation are examples for electromagnetic waves. Many applications require to focus the electromagnetic fields to...
Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers
Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...
Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.
At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...