Search results for "Optical radiation"
showing 4 items of 4 documents
Tuning of an Optical Dimer Nanoantenna by Electrically Controlling Its Load Impedance
2009
International audience; Optical antennas are elementary units used to direct optical radiation to the nanoscale. Here we demonstrate an active control over individual antenna performances by an external electrical trigger. We find that by an in-plane command of an anisotropic load medium, the electromagnetic interaction between individual elements constituting an optical antenna can be controlled, resulting in a strong polarization and tuning response. An active command of the antenna is a prerequisite for directing light wave through the utilization of such a device.
Safety uses of optical fiber communication systems
2005
The paper is focused on problems of optical radiation, which occurs in systems and devices of optical fiber communications, during their usual exploitation, and in breakage situations. Mainly in aspects of open (possible to disconnect) fiber optic optical system and/or accidental affection of electromagnetic radiation (in visible and infrared spectrum) on human being. Considerations about safeness of using fiber optical systems and devices were examined on the basis of directions and obligatory standards or propositions of changing them as results of newest research.
Nonlinear photon-assisted tunneling transport in optical gap antennas.
2014
International audience; We introduce strongly coupled optical gap antennas to interface optical radiation with current-carrying electrons at the nanoscale. The transducer relies on the nonlinear optical and electrical properties of an optical gap antenna operating in the tunneling regime. We discuss the underlying physical mechanisms controlling the conversion involving d-band electrons and demonstrate that a simple two-wire optical antenna can provide advanced optoelectronic functionalities beyond tailoring the electromagnetic response of a single emitter. Interfacing an electronic command layer with a nanoscale optical device may thus be facilitated by the optical rectennas discussed here.
Protection concepts from optical radiation used in places of danger from explosion of gases, vapour or cloud of particles
2005
Use of optical systems in hazardous locations can result in ignition of surrounding explosive atmosphere. The conducted research work allowed to propose three protection concepts. The primary protection concept - inherently safe optical radiation - consists in use of optical radiation with power, energy or irradiance incapable of causing ignition of surrounding explosive atmosphere. However, the arbitrary determination of values of these parameters is considered as excessively rigorous. The work presents the proposed protection concepts in relation to zone classification. The author describes his own method to determine safe values based on probability mathematics that can be used not only …