Solid State Technology and Devices Seminar: The Best Reciprocal Resonators Make the Best Nonreciprocal Systems
Seminar | April 27 | 1-2 p.m. | Cory Hall, 521 Hogan Room
Sunil Bhave, Purdue University
Circulators are a key building block in next generation microwave systems for Simultaneous Transmit and Receive Radios (STAR) and Quantum Computing. State-of-the-art circulators have a ferro-magnet that breaks reciprocity but is hard to scale down to chip-scale dimensions for integrating with on-chip electronic components. The demand is even more urgent in photonic systems where it is essential to Isolate the laser from reflections of downstream components.
Over the last few years there has been outstanding theoretical and experimental progress in RF optical non-reciprocal technologies. In this talk I will convince you that in order to build superb non-reciprocal systems, all you need is a design library, a foundry technology and generous industry collaborators. I will demonstrate an RF circulator built using Broadcoms film bulk acoustic resonators (FBARs) and highlight the advantages of mechanical coupling towards improving power handling and bandwidth of the FBAR circulator. In the second half of my talk I will provide a glimpse of how we attempt to leverage HBARs (the FBARs cousin) to modulate LiGenTecs optical ring resonators and demonstrate high bandwidth optical isolation.