Open nanoacoustic resonators based on SrTiO 3 /YBa 2 Cu 3 O 7− x superlattices
Year: 2026
Type: article
Abstract: We report the design and experimental demonstration of an open nanophononic cavity based on a hybrid oxide superlattice composed of SrTiO 3 (STO) and YBa 2 Cu 3 O 7− x (YBCO), combined with a metallic Ni transducer for coherent phonon generation. The STO/YBCO periodic stack acts as an acoustic distributed Bragg reflector supporting confined longitudinal acoustic phonons in the sub-THz regime, while the Ni layer enables efficient ultrafast optical excitation and detection by time-domain Brillouin scattering. Transient reflectivity measurements reveal confined acoustic dynamics and a well-defined cavity resonance, in agreement with transfer-matrix calculations of acoustic response and mode profiles. These results demonstrate phonon confinement in multifunctional oxide heterostructures and establish complex oxide superlattices as a platform for hybrid nano-acoustic resonators and ultrafast phonon control of correlated electronic phases.
Source: Optical Materials Express
DOI: 10.1364/ome.608988
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,843
OpenAlex ID: W7203787522