Brillouin scattering was for many years confined to experiments in hundreds of metres of optical fibre, in which the spectrum was fixed and where Brillouin properties were almost identical to those of bulk materials. A recent renaissance in Brillouin scattering research has been driven by the increasing maturity of photonic integration platforms as well as advances in nanophotonics and nonlinear optics. A central problem to be solved in integrated applications has been the simultaneous confinement of the optical and acoustic waves. Traditional silicon nanowires confine light but do not confine sound and the group IV semiconductors are typically very stiff so that rib waveguides do not guide elastic waves. A first solution to the confinement problem, and the first demonstration of SBS in an integrated photonic environment, was found in the chalcogenide soft glass platform, where the high refractive index and low stiffness of As2Se3 glass allowed for confinement of both optical and elastic waves by total internal reflection, leading to strong Brillouin gain and a multitude of application possibilities. I will review the diverse array of strategies that have been used to enhance and shape Brillouin interactions within integrated photonic waveguide systems, as well as some of the goals and motivations of the growing field of integrated Brillouin photonics with particular emphasis on my group's research on developing compact microwave photonic functions.
This seminar is sponsored by the department of Applied Physics and the Ginzton Laboratory.
Professor Ben Eggleton is the Director of The University of Sydney Nano Institute. He also currently serves as co-Director of the NSW Smart Sensing Network (NSSN). He was previously an ARC Laureate Fellow and an ARC Federation Fellow twice and was founding Director of the ARC Centre of Excellence for Ultrahigh bandwidth Devices for Optical Systems (CUDOS) from 2003-2017. Eggleton has published more than 510 journal publications, including Science, Nature Photonics, Nature Physics, Nature Communications, Physical Review Letters and Optica and over 200 invited presentations. His journal papers have been cited 23,000 times according to webofscience with an h-number of 74 (99 in google scholar). Eggleton is a Fellow of the Australian Academy of Science (AAS), the Australian Academy of Technology and Engineering (ATSE), the Optical Society of America, IEEE Photonics and SPIE. He is Editor-in-Chief of APL Photonics.