A group of physicists at the State University of Information Technology and Optometry in Petersburg, the Moscow Institute of Physics and Technology and the University of Texas at Austin have developed an unconventional nanowire that can scatter light in a particular direction depending on the intensity of the incident radiation . The results of this study will contribute to the development of flexible optical information processing in telecommunication systems.
As a carrier of electromagnetic radiation, photons have neither mass nor charge. This means that the light is relatively unmanageable, unlike the controllable application of a constant electric field unlike, for example, electrons. However, some devices such as nano-antennas can achieve electromagnetic wave propagation control to some extent.
One area that requires "advanced" light processing is the development of optical computers. In these devices, the information is not carried by the electrons, but by the photons. Using light instead of charged particles can dramatically increase the speed at which information can be transmitted and processed. Achieving this type of computer requires, for example, a particular nano-antenna device that has the characteristic of being manipulatable to some extent by applying a constant electric or magnetic field or by changing the intensity of incident light.
In an article published in the journal Laser and Photonics, the researchers devised a new type of nonlinear nanowire that changes the direction of light scattering according to the intensity of incoming waves (Figure 1). The core of the nanowire proposed in this study is silicon nanoparticles, which produce electron plasmas under stringent laser radiation. The authors have previously demonstrated the possibility of using these nanoparticles for non-linear and ultrafast control of light. The researchers then managed to manipulate part of the light for forward and backward radiation scattering. Now, by changing the intensity of incident light, they have found a way to constrain a scattered light in the desired direction.
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