High quality broadband spatial reflections of slow Rayleigh surface acoustic waves modulated by a graded grooved surface

Yanlong Xu, Pai Peng

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We report high quality broadband spatial reflections of Rayleigh surface acoustic waves (SAWs) through a graded grooved surface. High quality means that no wave is allowed to transmit and the incident wave is nearly all reflected to the input side. The graded grooved surface is structured by drilling one dimensional array of graded grooves with increased depths on a flat surface. We investigate SAW dispersion relations, wave field distribution at several typical SAW wavelengths, and time evolution of a Gaussian pulse through the graded grooved surface. Results show that the input broadband Rayleigh SAWs can be slowed, spatially enhanced and stopped, and finally reflected to the input side. The study suggests that engraving the flat surface can be used as an efficient and economical way to manipulate Rayleigh SAWs, which has potential application in novel SAW devices such as filters, reflectors, sensors, energy harvesters, and diodes.
Original languageEnglish (US)
Pages (from-to)035103
JournalJournal of Applied Physics
Volume117
Issue number3
DOIs
StatePublished - Jan 21 2015

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