High quality factor lithium niobate electrostrictive HBAR resonators

Electrostrictive acoustic resonators have been widely investigated during the last 8 years. Despite their interesting dc-controlled electromechanical coupling and switchable properties, the main drawback remains their poor quality factor. Here we show that HBAR LiNbO3 single crystals can be useful to act as high quality factor switchable resonators thanks to their electrostrictive properties and to their intrinsic low acoustic losses. For a resonance frequency at 1.95GHz, HBAR Q reaches 9000. This outstanding behaviour could be of interest for RF applications.