2018/05/31 by Atiyeh Zarifi, Birgit Stiller, Moritz Merklein +12 · 17 citations
Engineering · Physics and Astronomy · #Acoustic Wave Phenomena Research #Brillouin scattering #Brillouin zone #Fabrication #Light scattering #Mechanical and Optical Resonators #Photonic and Optical Devices #Photonics #Scattering #Silicon #Waveguide #physics.optics
paper · pdf · doi:10.1364/ol.43.003493
published in Optics Letters 43(15), 3493 (Optica Publishing Group) · 5 pages, 4 figures
arxiv created 2018/05/31 · openalex created_date 2018/06/13 · openalex publication_date 2018/07/16 · arxiv updated 2018/08/15 · openalex updated_date 2026/08/06
Recent advances in design and fabrication of photonic-phononic waveguides have enabled stimulated Brillouin scattering in silicon-based platforms such as underetched silicon waveguides and hybrid waveguides. Due to the sophisticated design and, more importantly, high sensitivity of the Brillouin resonances to geometrical variations in micro- and nano-scale structures, it is necessary to have access to the localized opto-acoustic response along those waveguides to monitor their uniformity and maximize their interaction strength. In this Letter, we design and fabricate photonic-phononic waveguides with a deliberate width variation on a hybrid silicon-chalcogenide photonic chip and confirm the effect of the geometrical variation on the localized Brillouin response using a distributed Brillouin measurement.