We experimentally realize nano-antennas based on hybrid silicon-gold nanoparticles (NPs). The silicon particles covered by clusters of small metal NPs are fabricated from a liquid phase under the effect of the laser irradiation. The complex nanoclusters containing both Si and Au components provide the enhancement of the near-field intensity and the resonant light scattering associated with excitation of multipole resonances in NPs. A strong sensitivity of the resonant light absorption to the hybrid particle size and material parameters is experimentally documented and theoretically discussed. The results demonstrate a high potentiality of the hybrid NPs for the realization of functional optical devices and metasurfaces.
Epitaxial n-PbTe films grown on CaF 2 /Si(1 1 1) wafers using MBE were treated in an inductively coupled high-density Ar-plasma for a time period of 30 s. AFM measurements showed that after the treatment process large hillocks, 350-450 nm high, are formed on the dislocation exit sites. The tips of the hillocks have triangular dislocation exit pits. The density of the large hillocks corresponds to the dislocation density on the initial surface.
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