We propose and design aluminum nitride slot waveguides with acoustic pumping to achieve large forward stimulated Brillouin scattering. The slot structure can constructively add to or destructively interfere with optical forces. The novel arrangement of symmetric electrodes can provide out-of-plane electric fields for piezoelectric materials and excite acoustic waves that satisfying the necessary phase-matching. In this work, the pump photons is intramode scattered into an anti-Stokes sideband by injected phonons. Our aluminum nitride slot waveguide is partly suspended on the silica glass to avoid the leakage of acoustic wave. The height of this waveguide is set to 500 μm and the gap is set to 50 μm. The distance between the electrode and the waveguide is flexible to adjust the piezomechanical coupling strength. Our proposed scheme offers an effective approach to implement acousto-optic interaction in integrated silicon photonics.
Brillouin lasing featured by narrow linewidth and wide tunability has been applied to sensing, coherent communication and microwave photonics. Here, we demonstrate a cascaded Brillouin lasing in the integrated silicon racetrack microring pumped by the external fiber loop. The elaborate micro-ring can tightly confine both optical and acoustic fields, and enable the efficient generation of cascaded forward stimulated Brillouin scattering. Under the high external pump power, we observe the cascaded Brillouin lasing up to 3 Stokes order and 3 anti-Stokes order. Our experiment provides a new method to realize a cascaded Brillouin lasing in on-chip platform.
We propose and theoretically investigate a hybrid silicon/aluminum nitride waveguide on the SOI platform. The proposed scheme enables both piezomechanical interaction and optomechanical interaction within the hybrid waveguide. The microwave is piezoelectrically coupled to mechanical vibration in the optical waveguide through the deposited aluminum nitride. On the other hand, the light is coupled to the mechanical vibration through the radiation pressure and electrostriction. The simulation results show that near-unity internal conversion efficiency from the microwave domain to the optical domain can be achieved.
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