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.
Metallic nanoantennas have been studied as efficient coherent phonon generators and detectors, harnessing their characteristic optical absorption and polarization dependence of the optical modes. The ability to control the excitation of phononic modes depends on the properties of the multiple optical resonances of the system. Lately, it has been made possible to optimally excite and detect phonon modes via plasmon resonances at the same optical frequency using chiral nanostructures and circularly polarized light. However, torsional modes remain elusive in nanophononic studies. In this work we present a simple system composed of two coupled bars, where torsional mechanical modes can be excited using light with null angular momentum. The twisting of the phononic mode is provided by the peculiar symmetry of the mechanical eigenmode due to the interaction of the bars via either the substrate or a central connector.
We will present a complete theoretical analysis of the phononic and plasmonic modes, their surface deformation field and electromagnetic field profiles.
V. Fomin, V. Gladilin, J. Devreese, J. Blokland, P. C. Christianen, J. Maan, A. Taboada, D. Granados, J. García, N. A. J. Kleemans, H. C. van Genuchten, M. Bozkurt, P. Koenraad
Theoretical analysis of the electron energy spectrum and the magnetization in a strained InxGa1-xAs/GaAs selfassembled
quantum ring (SAQR) is performed using realistic parameters, determined from the cross-sectional
scanning-tunneling microscopy characterization. The Aharonov-Bohm oscillations in the persistent current have
been observed in low temperature magnetization measurements on these SAQRs. The effect of the Coulomb
interaction on the energy spectra of SAQRs is studied for rings with two electrons and with an exciton. Our
analysis of the photoluminescence spectrum in magnetic fields up to 30 T shows that the excitonic properties
strongly depend on the anisotropic shape, size, composition and strain of the SAQRs and is in a good agreement
with the experimental data.
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