PHYSICS TALK – ITB
Brillouin Scattering in Silicon Nitride Photonic Circuits
Prof. David Marpaung
Nonlinear Nanophotonics Group
University of Twente, the Netherlands
Thursday, 18 August 2022, 09.00 WIB
Room 1201 Physics Building
Or you can attend online via Zoom:
https://itb-ac-id.zoom.us/j/92060370586?pwd=WVg4d21HQ29WRGU2S2I1Y0ZXTyszQT09
Meeting ID: 920 6037 0586
Passcode: physics
Abstract:
Stimulated Brillouin scattering (SBS) has recently been studied extensively in integrated waveguides. However, many implementations rely on complicated fabrication schemes, using suspended waveguides, or non-standard materials. The absence of SBS in standard and mature fabrication platforms prevents large-scale circuit integration and severely limits the potential of this technology. Notably, SBS in standard silicon nitride integration platform is currently rendered out of reach due to the lack of acoustic guiding and the infinitesimal photo-elastic response of the material. In this talk, we report advanced control of backward SBS in multilayer silicon nitride waveguides. By optimizing the separation between two silicon nitride layers, we unlock gigahertz acoustic waveguiding in this platform for the first time, leading up to 15 times higher SBS gain coefficient than previously possible in silicon nitride waveguides. Using the same principle, we experimentally demonstrate on-demand inhibition of SBS by preventing acoustic guiding in the waveguide platform. We utilize the enhanced SBS gain to demonstrate a microwave photonic notch filter with high rejection. We accomplish this in a low-loss, standard, and versatile silicon nitride integration platform without the need of suspending the SBS-active waveguide or hybrid integration.
Speaker’s Biography:
David Marpaung is a full professor leading the Nonlinear Nanophotonics group at the University of Twente, the Netherlands. He is a fellow of Optica (formerly OSA). He was the recipient of the 2015 Discovery Early Career Research Award (DECRA) from the Australian Research Council, the 2017 Vidi award and the 2019 START UP grant from the Netherlands Organisation for Scientific Research (NWO). In 2022 he was awarded the ERC Consolidator grant (2.55 million Euros) on the topic of 3D photonic circuits for Brillouin scattering. His research interests include integrated photonics, nonlinear optics, and microwave photonics.