High-Q one- and two-dimensional phononic cavities (WP1-6)

Host: University of Valencia (UVEG)
Supervisor: M. de Lima, Co-supervisor: P. Delsing (Chalmers)

Valencia

André Bilobran

André Bilobran, brazilian, 26 years old. Doing PhD at the University of Valencia under supervision of Prof. Dr. Maurício M. de Lima Jr. and co-supervision of Prof. Dr. P. Delsing (Chalmers). My project is entitled “High-Q one- and two-dimensional phononic cavities”.
I received a Bachelor and a Master degree in Physics after attending the Federal University of Parana (Curitiba, Brazil), in 2013 and 2015, respectively. My master’s project, advised by Prof. Dr. Renato M. Angelo, was entitled “A measure of physical reality”. Using tools of Quantum Information Theory we proposed an empirical protocol by which one can identify the elements of reality within Quantum Mechanics. Before that, during my graduation, I worked in a project concerning friction of circular bodies.

Objectives

We have recently demonstrated analogues of fundamental quantum-mechanical systems (Bloch oscillations, Wannier-Stark ladders and Landau-Zener tunnelling) based on SAWs propagating in 1D coupled acoustic cavities. The coupling between these cavities can be electrically tuned by controlling the potential of the acoustic cavities’ electrodes.

The objectives of the ESR3-UVEG1 are the extension of this seminal work to 2D tuneable phononic cavities as well as obtaining cavities with high Q-factor for different applications. In this way, this work will collaborate with ESR9-UAU2 that aims at using phononic cavities to couple phonons with excitons. Another application is their combination with the ridge waveguide photonic devices investigated by ESR4-UVEG2. Finally, these phononic cavities will also be used to detect acoustic fields down to the single-phonon limit in a strong collaboration with ESR15-CHALMERS.

Expected Results

ESR3-UVEG1 will learn how to calculate, design and fabricate SAW cavities for different applications. This work will lead to 2D coupled phononic cavities as well as high-Q structures, in collaboration with UAU. The ESR will learn to fabricate structures with small dimensions and high frequencies, in collaboration with NTD taking advantage of their nanoimprint capabilities. In addition, in this secondment ESR3-UVEG1 will have contact with an industrial environment. Acoustic-field mapping will be obtained by interferometry, in collaboration with PDI. In a secondment to CHALMERS the student will apply the cavities to detection at the single-phonon level and will acquire knowledge on measurements at very low temperatures.