TITLE

Large band gaps in elastic phononic crystals with air inclusions

AUTHOR(S)
Yun Lai, A.V.; Zhao-Qing Zhang, A.V.
PUB. DATE
November 2003
SOURCE
Applied Physics Letters;11/10/2003, Vol. 83 Issue 19, p3900
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We find that a large absolute band gap can be created by inserting air inclusions in a two-component elastic phononic crystal with small density contrast and filling fraction. The positions of the insertion are chosen to suppress the shear potential energy of the first optical band and lower their frequencies. This is demonstrated in a two-dimensional system consisting of aluminum cylinders in a triangular lattice with a filling fraction of 0.145 embedded in an epoxy host. Both the band structure and the transmission calculations show that the insertion of air cylinders in the earlier system is capable of creating a large elastic band gap with gap/midgap ratio Δω/ω[sub c]=0.53. Such a system makes the realization of a light and effective sonic insulator possible. © 2003 American Institute of Physics.
ACCESSION #
11332778

 

Related Articles

  • Computational formulas for symmetry-forbidden vibronic spectra and their application to n–π[sup *] transition in neat acetone. Shiu, Y. J.; Hayashi, M.; Mebel, A. M.; Chen, Yit-Tsong; Lin, S. H. // Journal of Chemical Physics;Sep2001, Vol. 115 Issue 9, p4080 

    In this study theoretical expressions are derived to investigate the non-Condon effect for symmetry-forbidden optical transition using displaced–distorted harmonic potential energy surfaces. These expressions can efficiently cope with multipromoting modes and multielectronic states...

  • Inherent structures in the potential energy landscape of solid 4He. Hodgdon, Jennifer A.; Stillinger, Frank H. // Journal of Chemical Physics;1/1/1995, Vol. 102 Issue 1, p457 

    We study the potential energy landscape (many-atom potential energy as a function of atomic positions) of solid hcp 4He in the vicinity of the 0 K crystal structure using an accurate pair potential. At the melting point, the potential energy of the helium lattice is far above the minimum hcp...

  • Molecular properties of the PCO radical: heat of formation and the isomerization pathways. Viana, Rommel; Guimarães, Amanda; Souza, Aguinaldo; Silva, Albérico // Journal of Molecular Modeling;Feb2014, Vol. 20 Issue 2, p1 

    The potential energy surface of [P,C,O] system in the ground state was investigated by quantum chemical methods. Four different isomers were characterized at the B3LYP/aug-cc-pVTZ: COP ( i1), cPCO ( i2), PCO ( i3), and CPO ( i4). The linear species i3 is the global minimum in the ground state...

  • Potential Energy Surfaces for H Adsorbed at 4H-SiC{0001} Surfaces. WACHOWICZ, E.; KIEJNA, A. // Acta Physica Polonica, A.;Nov2013, Vol. 124 Issue 5, p765 

    The constant adsorption energy surfaces for hydrogen adsorbed on Si- and C-terminated hexagonal 4H-SiC{0001} surfaces have been calculated within density functional theory framework. The two unreconstructed and one reconstructed √ 3 × √ 3 surfaces were taken into account. We show...

  • DFT and Experimental (FT-IR) Investigation of Vibrational Spectroscopy of 4- hydroxy-1-methyl-2(1 H)-quinolone (HMQ). Alseroury, Fathia A. // Australian Journal of Basic & Applied Sciences;2011, Vol. 5 Issue 6, p611 

    The optimized geometry and vibrational frequencies of 4-hydroxy-1-methyl-2(1 H)-quinolone (HMQ) were obtained by DFT/B3LYP level with complete relaxation in the potential energy surface using 6-31G and 6-311G basis sets. The Fourier-transform infrared (FT-IR) spectrum of HMQ has been recorded in...

  • Vibronically induced decay paths from the C1B1-state of water and its isotopomers. Dixon, Richard N.; Oliver, Thomas A. A.; Cheng, Lina; Cheng, Yuan; Yuan, Kaijun; Yang, Xueming // Journal of Chemical Physics;Mar2013, Vol. 138 Issue 10, p104306 

    The photochemistry of the water molecule has revealed a wealth of quantum phenomena, which arise from the involvement of several coupled electronic states with very different potential energy surfaces. Most recently, dissociation from single rotational levels of its C1B1 state near 124 nm has...

  • On the structure of hot absorption spectra of polyatomic molecules: Solvent effect on the transition energy gap. Tranca, D. C.; Neufeld, A. A. // Journal of Chemical Physics;4/14/2009, Vol. 130 Issue 14, p141102 

    Hot absorption spectra of polyatomic molecules may exhibit a characteristic shoulder. Its origin and connection to the 0-0 transition energy gap has been established on the basis of a recently developed quantum-classical approach. We demonstrate that an accurate estimate of the transition energy...

  • Instability of DX-like Impurity Centers in PbTe:Ga at Annealing. Dolzhenko, D. E.; Demin, V. N.; Ivanchik, I. I.; Khokhlov, D. R. // Semiconductors;Oct2000, Vol. 34 Issue 10, p1144 

    The kinetics of variation in the resistance of PbTe:Ga single crystals, with their Fermi level pinned within the band gap, during annealing at temperatures of up to 400�C was studied for the first time. It is shown that annealing the crystals for only several minutes at 200-250�C leads...

  • Difference-frequency generation and sum-frequency generation near the band gap of zincblende.... Zhang, X.-C.; Jin, Y.; Ware, K.; Ma, X.F.; Rice, A.; Bliss, D.; Larkin, J.; Alexander, M. // Applied Physics Letters;1/31/1994, Vol. 64 Issue 5, p622 

    Demonstrates the difference- and sum-frequency generation (DFG-SFG) near the band gap of zincblende crystals. Measurement of radiation field and intensity; Analysis of crystallographic orientation and fundamental photon energy; Characterization of DFG and SFG angular dependence.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics