Bloch-wave expansion technique for predicting wave reflection and transmission in two-dimensional phononic crystals

2014 ◽  
Vol 135 (4) ◽  
pp. 1808-1819 ◽  
Author(s):  
Jason A. Kulpe ◽  
Karim G. Sabra ◽  
Michael J. Leamy
Keyword(s):  
Wave Reflection ◽  
Bloch Wave ◽  
Phononic Crystals ◽  
Two Dimensional ◽  
Reflection And Transmission ◽  
Wave Expansion ◽  
Expansion Technique

scholarly journals Enhanced plane wave expansion analysis for the band structure of bulk modes in two-dimensional high-contrast solid–solid phononic crystals

2014 ◽  
Vol 12 (5) ◽  
pp. 487-492 ◽  
Author(s):  
Mohammadhosein Ghasemi Baboly ◽  
Yasser Soliman ◽  
Mehmet F. Su ◽  
Charles M. Reinke ◽  
Zayd C. Leseman ◽  
...  
Keyword(s):  
Band Structure ◽  
Plane Wave ◽  
Phononic Crystals ◽  
Two Dimensional ◽  
High Contrast ◽  
Plane Wave Expansion ◽  
Wave Expansion

Parabolas from Reconstructed Surfaces Observed in Convergent-Beam RHEED Patterns

1990 ◽  
Vol 48 (2) ◽  
pp. 398-399
Author(s):  
M. Gajdardziska-Josifovska
Keyword(s):  
Electron Microscopy ◽  
High Energy ◽  
Two Dimensional ◽  
High Energy Electron ◽  
Reflection And Transmission ◽  
Experimental Diffraction Pattern ◽  
Surface Resonance ◽  
Reconstructed Surfaces ◽  
Reflection Electron Microscopy ◽  
Convergent Beam

Parabolas have been observed in the reflection high-energy electron diffraction (RHEED) patterns from surfaces of single crystals since the early thirties. In the last decade there has been a revival of attempts to elucidate the origin of these surface parabolas. The renewed interest stems from the need to understand the connection between the parabolas and the surface resonance (channeling) condition, the latter being routinely used to obtain higher intensity in reflection electron microscopy (REM) images of surfaces. Several rather diverging descriptions have been proposed to explain the parabolas in the reflection and transmission Kikuchi patterns. Recently we have developed an unifying general treatment in which the parabolas are shown to be K-lines of two-dimensional lattices. Here we want to review the main features of this description and present an experimental diffraction pattern from a 30° MgO (111) surface which displays parabolas that can be attributed to the surface reconstruction.

Multiband acoustic waveguides constructed by two-dimensional phononic crystals

2020 ◽  
Vol 13 (9) ◽  
pp. 094001
Author(s):  
Wei Zhao ◽  
Yunfei Xu ◽  
Yuting Yang ◽  
Zhi Tao ◽  
Zhi Hong Hang
Keyword(s):  
Phononic Crystals ◽  
Two Dimensional ◽  
Acoustic Waveguides
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