Abstract
Medical techniques such as transcranial ultrasound beam focusing suffer from energy losses and distorted acoustic fields. Researchers show how metamaterials can be used to enhance acoustic transmission.
Highlights
In many medical ultrasound or nondestructive evaluation (NDE) applications, ultrasound needs to be transmitted through an aberrating layer [1,2,3,4,5,6,7], where either the transmission is desired to be maximized or the reflection needs to be minimized
An acoustic metamaterial could be used to cancel out or cloak the aberrating layer, allowing the acoustic wave to pass through the layer without energy loss (Fig. 1)
Lai et al demonstrated that cloaking or illusion based on electromagnetic wave (EM) complementary metamaterials (CMM) [15] can open up a virtual hole in a wall without distortion [16,17]
Summary
In many medical ultrasound or nondestructive evaluation (NDE) applications, ultrasound needs to be transmitted through an aberrating layer [1,2,3,4,5,6,7], where either the transmission is desired to be maximized or the reflection needs to be minimized. Let ρðcÞðxðcÞ; yðcÞ; zðcÞÞ, βðcÞðxðcÞ; yðcÞ; zðcÞÞ and ρðaÞðxðaÞ; yðaÞ; zðaÞÞ, βðaÞðxðaÞ; yðaÞ; zðaÞÞ be the effective density and compressibility tensors of the CMM and the aberrating layer, respectively. XðcÞ, yðcÞ, zðcÞ and xðaÞ, yðaÞ, zðaÞ are generalized curved coordinates.
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