24 November

Brillouin scattering in bosonic systems

Thursday 24 November 2022, 12:00pm

ICN2 Seminar Room, Campus UAB


PhD: Omar Flórez

Directors: Prof. Clivia M. Sotomayor, Phononic and Photonic Nanostructures Group Leader at ICN2 and Dr Pedro D. Garcia, Materials Science Institute of Madrid (ICMM)

Abstract: This doctoral thesis covered the design and experimental characterization of trivial phononic waveguides, also called defect waveguides, as well as the design of phononic topological waveguides based in the analogy of the quantum spin Hall effect (QSHE) and the quantum valley Hall effect (QVHE). For the case of trivial waveguides, we first report the full characterization of hypersonic bandgaps with up to 64 % of gap to mid-gap ratio. The same structures were used to build defect line waveguides in which it was possible to measure hypersonic guided modes at room temperature by detecting thermally excited phonons in the structure.