Acoustic properties of piezoactive heterostructures made of thin lithium niobate plates
Author details
- Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
- Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
- Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
- Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don, Russian Federation
Abstract
A mathematical model of excitation of surface acoustic waves (SAW) on the surface of a piezoelectric heterostructure "lithium niobate W-cut plate – silicon substrate" has been developed and investigated, where W is a cut, the normal to the surface of which has the directions of the most common industrial cuts Z, X, Y, 41Y, 64Y, 128Y. Along with the cut orientation, the model takes into account the direction of wave propagation and the plate thickness in relation to the wavelength, which allows choosing crystallographic and geometric parameters for efficient excitation of SAWs. A study of the phase velocity of Rayleigh and Love waves on the heterostructure surface was carried out for two cases: when its surface is free and when it is metallized and grounded. This made it possible to calculate the electromechanical coupling coefficient (EMCC), which characterizes the excitation efficiency of both Rayleigh and horizontally polarized shear SAWs in the heterostructure. The study showed that on lithium niobate plates of all types of cuts, the Love waves EMCC reaches higher values compared to the Rayleigh waves KEMS. Of all the industrial types of lithium niobate plate cuts on this heterostructure, the most effective for exciting Love waves are the X-, Y- and 128Y-cuts, on which the EMCC reaches values of 0.4, 0.38 and 0.39, respectively. An additional study revealed the 160Y cut, on which the EMCC reaches an absolute maximum. The obtained results provide an opportunity to significantly simplify the process of designing SAW devices and devices by selecting the optimal geometric parameters of the heterostructure with a lithium niobate plate of a given cut.
Keywords
АКУСТИЧЕСКИЕ СВОЙСТВА ПЬЕЗОАКТИВНЫХ ГЕТЕРОСТРУКТУР, ВЫПОЛНЕННЫХ ИЗ ТОНКИХ ПЛАСТИН НИОБАТА ЛИТИЯ
Разработана и исследована математическая модель возбуждения поверхностных акустических волн (ПАВ) на поверхности пьезоактивной гетероструктуры «пластинка W-среза ниобата лития – подложка кремния», где W – срез, нормаль к поверхности которого имеет направления наиболее распространенных промышленных срезов Z, X, Y, 41Y, 64Y, 128Y. Наряду с ориентацией среза модель учитывает направление распространения волны и толщину пластинки по отношению к длине волны, что позволяет осуществлять выбор кристаллографических и геометрических параметров для эффективного возбуждения ПАВ. Проведено исследование фазовой скорости распространения волн Рэлея и Лява на поверхности гетероструктуры для двух случаев: когда ее поверхность свободна и когда она металлизирована и заземлена. Это позволило вычислить коэффициент электромеханической связи (КЭМС), характеризующий эффективность возбуждения в гетероструктуре как релеевских, так и горизонтально поляризованных сдвиговых ПАВ. Исследование показало, что на пластинках ниобата лития всех типов срезов КЭМС волны Лява достигает более высоких значений по сравнению с КЭМС релеевских волн. Из всех промышленных типов срезов пластинок ниобата лития на данной гетероструктуре наиболее эффективными для возбуждения волн Лява оказываются X-, Y- и 128Y-срез, на которых КЭМС достигает значений 0,4, 0,38 и 0,39 соответственно. Дополнительное исследование позволило обнаружить срез 160Y, на котором КЭМС достигает абсолютного максимума. Полученные результаты предоставляют возможность существенно упростить процесс проектирования приборов и устройств на ПАВ за счет выбора оптимальных геометрических параметров гетероструктуры с пластиной ниобата лития заданного среза.
Ключевые слова
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