Mesoporous-based responsive acoustic resonators operating in the GHz range

Edson R. Cardozo de Oliveira; Chushuang Xiang; Priscila Vensaus; Konstantinos Papatryfonos; Abdelmounaim Harouri; Galo J. A. A. Soler-Illia; Norberto Daniel Lanzillotti-Kimura

doi:10.1117/12.3022162

10 June 2024 Mesoporous-based responsive acoustic resonators operating in the GHz range

Edson R. Cardozo de Oliveira, Chushuang Xiang, Priscila Vensaus, Konstantinos Papatryfonos, Abdelmounaim Harouri, Galo J. A. A. Soler-Illia, Norberto Daniel Lanzillotti-Kimura

Author Affiliations +

Proceedings Volume 12991, Nanophotonics X; 129911L (2024) https://doi.org/10.1117/12.3022162
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Conference Poster

Abstract

The manipulation of ultra-high-frequency acoustic phonons in the tens of gigahertz to sub-terahertz range offers a promising avenue for technological advancements. This control can be achieved by means of semiconductor superlattices, such as GaAs/AlAs, which requires costly fabrication processes in order to achieve atomically flat interfaces to avoid phonon scattering and dephasing. In addition, acoustic resonators based on such systems are bound to fixed frequency operations. Mesoporous materials, with pores at the nanoscale, are good candidates to overcome such limitations. It has been shown that multilayered resonators based on mesoporous SiO₂ and TiO₂ support acoustic resonances in the 5-100 GHz range. These materials are susceptible to liquids and vapors infiltration into the pores, causing the modification of the effective optical and elastic parameters. Here we present a design of open-cavity acoustic resonators of SiO₂ Mesoporous Thin Films (MTFs) responsive to the environment. The resonator is composed of an acoustic distributed Bragg reflector, to avoid phonon diffusion towards the substrate, followed by a nickel acousto-optical transducer, and the MTF on top. We characterize the resonator by using coherent phonon generation and detection experiments in a reflectivity pump-probe setup and compare it with a simplified structure. The experimental results show that the acoustic signals in the open-cavity resonator have improved performance. Our findings unveil a promising platform for nanoacoustic reconfigurable optoacoustic devices based on soft, inexpensive fabrication methods. As a perspective to this work, we aim at studying the dependence of the acoustic resonances on the environment humidity.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Edson R. Cardozo de Oliveira, Chushuang Xiang, Priscila Vensaus, Konstantinos Papatryfonos, Abdelmounaim Harouri, Galo J. A. A. Soler-Illia, and Norberto Daniel Lanzillotti-Kimura "Mesoporous-based responsive acoustic resonators operating in the GHz range", Proc. SPIE 12991, Nanophotonics X, 129911L (10 June 2024); https://doi.org/10.1117/12.3022162

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