The patterning of silicon with a period at the subwavelength scale has opened new degrees of freedom to control not only the propagation of light but also of sound. In this invited contribution, we will present our latest results on subwavelength-engineered silicon optomechanical waveguides. We harness subwavelength nanostructuration in a silicon slot waveguide to shape the distribution of the optical mode and maximize the coupling with the mechanical mode. Based on this approach, we demonstrate an enhanced Brillouin gain and a high tunability of the mechanical frequency.
In this invited presentation, we will show our most recent results on the use of subwavelength engineering of photons and phonons in suspended and non-suspended silicon optomechanical devices. These results open exciting new perspectives to exploit optomechanical effects with scalable silicon photonics technology, having great potential for applications in optical and wireless communications, radar, sensing, metrology and quantum technologies.
Simultaneous confinement of optical and mechanical modes is a requirement for an efficient Brillouin effect. In silicon-on-insulator (SOI) waveguides this challenge is solved by removing the silica under-cladding. Here we show that subwavelength engineering of the longitudinal and transversal geometries facilitates independent control of the photonic and phononic modes, hence allowing for strong Brillouin scattering. Here, we present a suspended silicon waveguide where a subwavelength lattice of lateral arms is used to separate the waveguide core from a phononic crystal.
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