The concept and design of acoustic Bragg mirrors and cavities made of multilayers of
piezoelectric oxides with superior acoustic performance and potential applications in
electronic and optical terahertz modulators are described. With these applications in mind
the authors have grown phonon mirrors consisting of Ba Ti O 3∕ Sr Ti O 3 superlattices on
Sr Ti O 3 substrates by reactive molecular-beam epitaxy and investigated their properties.
Characterization of the superlattices by x-ray diffraction and high-resolution transmission …