0000000000776318
AUTHOR
Andre Luiz Oliveira Bilobran
Coupled Surface Acoustic Wave Cavities
Durante las últimas dos décadas, las ondas acústicas de superficie (SAW) que se propagan en estructuras periódicas han atraído una gran atención y han sido la base de un gran número de investigaciones.Las etiquetas SAW, por ejemplo, exploran la posibilidad de utilizar dispositivos activos o pasivos para codificar información y utilizarla en muchas aplicaciones, desde el control del tráfico hasta la seguridad o la identificación de piezas en las líneas transportadoras. Se utilizan diseños muy similares para aplicaciones de detección, especialmente de temperatura y masa. Además, se han realizado una gran cantidad de avances científicos en el estudio de los cristales fonónicos (PnC). Los PnC s…
Acoustic spectral hole-burning in a two-level system ensemble
AbstractMicroscopic two-level system (TLS) defects at dielectric surfaces and interfaces are among the dominant sources of loss in superconducting quantum circuits, and their properties have been extensively probed using superconducting resonators and qubits. We report on spectroscopy of TLSs coupling to the strain field in a surface acoustic wave (SAW) resonator. The narrow free spectral range of the resonator allows for two-tone spectroscopy where a strong pump is applied at one resonance, while a weak signal is used to probe a different mode. We map the spectral hole burnt by the pump tone as a function of frequency and extract parameters of the TLS ensemble. Our results suggest that det…
Thermally Tunable Surface Acoustic Wave Cavities
We experimentally demonstrate the dynamical tuning of the acoustic field in a surface acoustic wave (SAW) cavity defined by a periodic arrangement of metal stripes on LiNbO3 substrate. Applying a dc voltage to the ends of the metal grid results in a temperature rise due to resistive heating that changes the frequency response of the device up to 0.3%, which can be used to control the acoustic transmission through the structure. The timescale of the switching is demonstrated to be of about 200 ms. In addition, we have also performed finite-element simulations of the transmission spectrum of a model system, which exhibits a temperature dependence consistent with the experimental data. The adv…