Abstract：
:The present study is focused on the development and characterization of an innovative substrate to optimize the axial resolution of ultrasonic transducers on a silicon substrate that is dedicated to ultrasound imaging. The substrate must efficiently dampen wave propagation to avoid degradation of the axial resolution of ultrasound images. In this study, the proposed approach implements a silicon substrate with a built-in acoustic damping layer composed of porous silicon. Porous silicon layers with thicknesses of less than 100 µm and porosities varying from 27% to 62% were fabricated, and their substrate resonances were characterized. The experimental results obtained in the frequency range from 6 MHz to 10 MHz show that the substrate acoustic damping is controlled by adjusting the characteristics of the porous silicon layer; a significant damping of 70% is demonstrated with only 70 µm of porous silicon.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Lascaud J,Defforge T,Gautier G,Certon Ddoi
10.1016/j.ultras.2019.01.006subject
Has Abstractpub_date
2019-07-01 00:00:00pages
196-202eissn
0041-624Xissn
1874-9968pii
S0041-624X(18)30626-7journal_volume
96pub_type
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