Measurements of Lamb-Wave Band Gaps and Waveguiding in 2-D Si-Based Phononic-Crystal Plates
Date Issued
2007
Date
2007
Author(s)
Kuo, Wei-Chih
DOI
en-US
Abstract
During the past decades, there has been a great interest in phononic crystals that are composite elastic materials distributed periodically. The most interesting character of phononic crystals is the band-gap phenomenon, prohibiting acoustic waves traveling through in a specific frequency range. To predict the band-gap width of phononic-crystal plate, the plane wave expansion (PWE) is applied to predict the dispersion relation of two-dimensional air/silicon phononic crystal plate.
By increasing the wavelength of the interdigital transducer (IDT) to the order that is comparable with the plate thickness, the surface acoustic wave (SAW) could be viewed as a Lamb wave. Since silicon is not the piezoelectric material, another piezoelectric material LiNbO3 is used. The calculated Lamb wave mode frequency of LiNbO3 shows good agreement with experimental results.
Air/silicon as phononic crystal plate and LiNbO3 as a Lamb wave generator are coupled together. The band gap of phononic crystal plate and the waveguide phenomenon along Γ-X direction is measured by this measuring setup.
Subjects
板波
聲子晶體平板
頻溝效應
交指叉狀電極
波導
phononic-crystal plate
band gap
IDT
Lamb wave
phononic-crystal waveguide
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R94543016-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):5a90f926324eb7ceefdd78a635d9fdd6