title: Phase-controlling phononic crystals: realization of acoustic Boolean logic gates.
abstract: A phononic crystal (PC) consisting of a square array of cylindrical polyvinylchloride inclusions in air is used to construct a variety of acoustic logic gates. In a certain range of operating frequencies, the PC band structure shows square-like equi-frequency contours centered off the gamma point. This attribute allows for the realization of non-collinear wave and group velocity vectors in the PC wave vector space. This feature can be utilized to control with great precision, the relative phase between propagating acoustic waves in the PC. By altering the incidence angle of the impinging acoustic beams or varying the PC thickness, interferences occur between acoustic wave pairs. It is recognized that information can be encoded with this mechanism (e.g., wave amplitudes/interference patterns) and accordingly to construct a series of logic gates emulating Boolean functions. The NAND, XOR, and NOT gates are demonstrated with finite-difference time-domain simulations of acoustic waves impinging upon the PC.
authors.affiliation: Department of Materials Science and Engineering, University of Arizona, Tucson, Arizona 85721, USA. stefanb@email.arizona.edu
authors.forename: S
authors.initials: S
authors.lastname: Bringuier
authors.forename: N
authors.initials: N
authors.lastname: Swinteck
authors.forename: J O
authors.initials: JO
authors.lastname: Vasseur
authors.forename: J-F
authors.initials: JF
authors.lastname: Robillard
authors.forename: K
authors.initials: K
authors.lastname: Runge
authors.forename: K
authors.initials: K
authors.lastname: Muralidharan
authors.forename: P A
authors.initials: PA
authors.lastname: Deymier
mesh_terms: D000162:Acoustics / Q000295:instrumentation*; D003198:Computer Simulation; D003460:Crystallization; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D011143:Polyvinyl Chloride / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013997:Time Factors
chemical_list: D011143:Polyvinyl Chloride