Experimental evidence of high-frequency complete elastic bandgap in pillar-based phononic slabs

Reza Pourabolghasem; Saeed Mohammadi; Ali A. Eftekhar; Abdelkrim Khelif; Ali Adibi

doi:10.1063/1.4903997

Experimental evidence of high-frequency complete elastic bandgap in pillar-based phononic slabs

Reza Pourabolghasem^*, Saeed Mohammadi, Ali A. Eftekhar, Abdelkrim Khelif, Ali Adibi

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

We present strong experimental evidence for the existence of a complete phononic bandgap, for Lamb waves, in the high frequency regime (i.e., 800MHz) for a pillar-based phononic crystal (PnC) membrane with a triangular lattice of gold pillars on top. The membrane is composed of an aluminum nitride film stacked on thin molybdenum and silicon layers. Experimental characterization shows a large attenuation of at least 20 dB in the three major crystallographic directions of the PnC lattice in the frequency range of 760 MHz-820 MHz, which is in agreement with our finite element simulations of the PnC bandgap. The results of experiments are analyzed and the physics behind the attenuation in different spectral windows is explained methodically by assessing the type of Bloch modes and the in-plane symmetry of the displacement profile.

Original language	English
Article number	231908
Journal	Applied Physics Letters
Volume	105
Issue number	23
DOIs	https://doi.org/10.1063/1.4903997
Publication status	Published - 8 Dec 2014
Externally published	Yes

Access to Document

10.1063/1.4903997

Cite this

@article{d960382e2cfb46a1a6b70bf527ae6d35,

title = "Experimental evidence of high-frequency complete elastic bandgap in pillar-based phononic slabs",

abstract = "We present strong experimental evidence for the existence of a complete phononic bandgap, for Lamb waves, in the high frequency regime (i.e., 800MHz) for a pillar-based phononic crystal (PnC) membrane with a triangular lattice of gold pillars on top. The membrane is composed of an aluminum nitride film stacked on thin molybdenum and silicon layers. Experimental characterization shows a large attenuation of at least 20 dB in the three major crystallographic directions of the PnC lattice in the frequency range of 760 MHz-820 MHz, which is in agreement with our finite element simulations of the PnC bandgap. The results of experiments are analyzed and the physics behind the attenuation in different spectral windows is explained methodically by assessing the type of Bloch modes and the in-plane symmetry of the displacement profile.",

author = "Reza Pourabolghasem and Saeed Mohammadi and Eftekhar, {Ali A.} and Abdelkrim Khelif and Ali Adibi",

note = "Publisher Copyright: {\textcopyright} 2014 AIP Publishing LLC.",

year = "2014",

month = dec,

day = "8",

doi = "10.1063/1.4903997",

language = "English",

volume = "105",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "23",

}

TY - JOUR

T1 - Experimental evidence of high-frequency complete elastic bandgap in pillar-based phononic slabs

AU - Pourabolghasem, Reza

AU - Mohammadi, Saeed

AU - Eftekhar, Ali A.

AU - Khelif, Abdelkrim

AU - Adibi, Ali

PY - 2014/12/8

Y1 - 2014/12/8

N2 - We present strong experimental evidence for the existence of a complete phononic bandgap, for Lamb waves, in the high frequency regime (i.e., 800MHz) for a pillar-based phononic crystal (PnC) membrane with a triangular lattice of gold pillars on top. The membrane is composed of an aluminum nitride film stacked on thin molybdenum and silicon layers. Experimental characterization shows a large attenuation of at least 20 dB in the three major crystallographic directions of the PnC lattice in the frequency range of 760 MHz-820 MHz, which is in agreement with our finite element simulations of the PnC bandgap. The results of experiments are analyzed and the physics behind the attenuation in different spectral windows is explained methodically by assessing the type of Bloch modes and the in-plane symmetry of the displacement profile.

AB - We present strong experimental evidence for the existence of a complete phononic bandgap, for Lamb waves, in the high frequency regime (i.e., 800MHz) for a pillar-based phononic crystal (PnC) membrane with a triangular lattice of gold pillars on top. The membrane is composed of an aluminum nitride film stacked on thin molybdenum and silicon layers. Experimental characterization shows a large attenuation of at least 20 dB in the three major crystallographic directions of the PnC lattice in the frequency range of 760 MHz-820 MHz, which is in agreement with our finite element simulations of the PnC bandgap. The results of experiments are analyzed and the physics behind the attenuation in different spectral windows is explained methodically by assessing the type of Bloch modes and the in-plane symmetry of the displacement profile.

UR - http://www.scopus.com/inward/record.url?scp=84916631686&partnerID=8YFLogxK

U2 - 10.1063/1.4903997

DO - 10.1063/1.4903997

M3 - Article

AN - SCOPUS:84916631686

SN - 0003-6951

VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 23

M1 - 231908

ER -

Experimental evidence of high-frequency complete elastic bandgap in pillar-based phononic slabs

Abstract

Access to Document

Other files and links

Fingerprint

Cite this