Brillouin spectroscopy of a hybrid silicon-chalcogenide waveguide with geometrical variations
Abstract
Recent advances in design and fabrication of photonic-phononic waveguides have enabled stimulated Brillouin scattering (SBS) in silicon-based platforms, such as under-etched 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 work, 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.
- Publication:
-
Optics Letters
- Pub Date:
- August 2018
- DOI:
- 10.1364/OL.43.003493
- arXiv:
- arXiv:1806.00140
- Bibcode:
- 2018OptL...43.3493Z
- Keywords:
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- Physics - Optics
- E-Print:
- 5 pages, 4 figures