Modeling the performance of a family of phononic pseudo-crystal interposers

Abstract

Recent technical efforts at Sandia National Laboratories have uncovered a need for high-frequency isolation in solid media across a range of ultrasonic frequencies; these needs include the requirement to suppress crosstalk between piezo-mechanical data and power channels situated on the same substrate. Broadband isolation larger than is possible with comparable phononic crystal designs is provided using a recently-developed phononic pseudo-crystal isolator concept. Insertion loss results from 2-D finite element simulations in COMSOL and 3-D simulations in Sierra-SD, Sandia’s HPC compatible structural dynamics simulation platform, are used to characterize the performance of characteristic examples of this family of phononic isolators. Sierra-SD uses massively parallel computing and high-order polynomial finite elements (P-elements) to mitigate the computational cost required to simulate coupled electrical-mechanical 3-D ultrasonic wave propagation. [SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525.]