Twisted acoustoplasmonic nanostructures

Simple acoustoplasmonic resonators, such as nanobars and crosses, are efficient light-hypersound transducers. The excitation of hypersonic modes in these structures strongly depends on the spatial profile of the acoustic and plasmonic eigenmodes and the optical properties of the system's resonances. Lately, it has been made possible to selectively excite and detect phonon modes via plasmon resonances at the same frequency using chiral nanostructures and circularly polarized light. In this work we present a system that is composed of a metallic propeller-like structure, based in a three lobed perforated clover whose top face is twisted with respect to its bottom one. The presence of the twisting angle gives rise to the excitation of non-conventional phononic modes. We will present a complete theoretical analysis of the phononic and plasmonic modes, their surface deformation field and electromagnetic field profiles.