Honeycomb phononic crystals with self-similar hierarchy
نویسندگان
چکیده
Davood Mousanezhad,1 Sahab Babaee,2 Ranajay Ghosh,1 Elsadig Mahdi,3 Katia Bertoldi,2 and Ashkan Vaziri1,* 1Department of Mechanical and Industrial Engineering, Northeastern University, Boston, Massachusetts 02115, USA 2Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA 3Mechanical and Industrial Engineering Department, Qatar University, Doha, Qatar (Received 1 May 2015; published 29 September 2015)
منابع مشابه
Complete phononic bandgaps and bandgap maps in two-dimensional silicon phononic crystal plates
It is shown that it is possible to obtain complete planar phononic bandgaps in square and hexagonal (honeycomb) lattice phononic crystals formed by etching a periodic array of circular holes in a thin silicon plate (or membrane). Also, better bandgap properties are obtained using the hexagonal lattice structure; and, with practical structure sizes, it is possible-to-obtain a gap-to-midgap ratio...
متن کاملMonolithic phononic crystals with a surface acoustic band gap from surface phonon-polariton coupling.
We theoretically and experimentally demonstrate the existence of complete surface acoustic wave band gaps in surface phonon-polariton phononic crystals, in a completely monolithic structure formed from a two-dimensional honeycomb array of hexagonal shape domain-inverted inclusions in single crystal piezoelectric Z-cut lithium niobate. The band gaps appear at a frequency of about twice the Bragg...
متن کاملInvestigation tow of negative refraction characters in the three different 2D phononic crystals
In this paper, a two-dimensional phononic crystal comprising of steel rod in water is investigated. Three cross- sections for this rod are considered using finite element method (EFM). We plot the equifrequency surface of the first band, because of equifrequency surface convex around the edge of the first Brillouin Zone, we guess the negative effective phononic mass and so negative refraction. ...
متن کاملEvidence of the existence of complete phononic band gaps in phononic crystal plates
We show, by measuring the transmission through a phononic crystal (PC) plate (slab), the evidence of the existence of large phononic band gaps (PBGs) in twodimensional PCs made by a hexagonal (honeycomb) array of holes etched through a free standing plate of silicon (Si). A CMOS compatible fabrication process is used on a Si on insulator (SOI) substrate to realize the devices. More than 30dB at...
متن کاملSoft phononic crystals with deformation-independent band gaps
Soft phononic crystals have the advantages over their stiff counterparts of being flexible and reconfigurable. Normally, the band gaps of soft phononic crystals will be modified after deformation due to both geometric and constitutive nonlinearity. Indeed these are important properties that can be exploited to tune the dynamic properties of the material. However, in some instances, it may be th...
متن کامل