Optoacoustical Transducer Based on Plasmonic Nanoparticles

Abstract

The problem of increasing the efficiency of optoacoustic conversion of energy is discussed. For this task, an array of metal nanoparticles is proposed to apply as a photoacoustic transducer. The absorption coefficient of optical energy can be significantly increased due to the presence of resonance lines in the absorption spectrum of the nanoparticle structure. The task of design of a spatially non-uniform absorbing optoacoustic transducer has also been studied. The application of non-uniformly absorbing transducers provides generation of acoustic pulses with a non-uniform phase front, including acoustic vortices. The optical properties of the nanoparticle array, the initial temperature profile in a single particle and the dynamics of the generated acoustic wave were calculated.