Phys.org July 29, 2021 An international team of researchers (Germany, Canada, USA – Perdue University) has detected the rolling movement of a nano-acoustic wave predicted by Lord Rayleigh in 1885. They used an extremely fine nanowire that was positioned on lithium niobate, a piezoelectric material, which becomes deformed when subjected to an electrical current. With the aid of small metal electrodes, an acoustic wave can be generated on the material. The acoustic wave generates an elliptically rotating electrical field. This, in turn, forces the electrons in the nanowire onto circular paths. So far, this phenomenon was seen in light. Now […]
Tag Archives: Acoustic waves
Controlling the optical properties of solids with acoustic waves
Science Daily December 2, 2019 So far moderately large changes in the exitons control parameters — temperature, pressure, electric and magnetic fields that can tune excitonic properties have only been achieved under equilibrium conditions and at low temperatures. An international team of researchers (Switzerland, Spain, Germany, USA- Simons Foundation Flatiron Institute, France) has demonstrated the control of excitonic properties using acoustic waves in titanium dioxide at room temperature. To do this, the researchers launched a high-frequency (hundreds of gigahertz), large-amplitude acoustic wave in the material using ultrashort laser pulses. This strategy allows for the dynamical manipulation of the exciton properties […]