Highly Sensitive Photoacoustic Imaging: A New Strategy for Ultrahigh Spatial Resolution Seismic Physical Model Imaging

Multifunctional SiO2/C/Fe3O4 Composite Particles with Photoacoustic and Magnetocaloric Properties

“…The PA properties of these three materials were investigate via PA excitation. After 0.1 g of powder material was pressed into a ∼1-mm-thick sheet material using a tablet press, a hydrophobic fluorosilane aqueous solution was deposited onto its surface to achieve a hydrophobic material . A 532 nm laser was used as the excitation light source and a piezoelectric transducer (PZT) was used as a detector to characterize the PA signals of the materials (Figure ).…”

Two-dimensional MXene Ti3C2 for Efficient Photoacoustic Conversion

“…To achieve the efficient PA conversion, the absorption rate of incident light energy and the volume swelling caused by temperature variations need to be as large as possible. Earlier studies have mainly used the single metal, metal oxides and 2D graphene analogues as the PA conversion materials [9][10][11]. However, the light absorption coefficient and thermal expansion coefficient are generally limited, resulting in the moderate ultrasonic pressure level in PA excitation.…”

Laser ultrasonic excitation using graphene heat dissipation film for ultrasonic detection of seismic physical model

“…Laser ultrasound, a method of using photoacoustic (PA) effect to excite broadband ultrasonic waves for detection, has been widely used in nondestructive testing [4]. There are also several reports in laser ultrasound imaging of SPM [5,6]. Finding suitable PA materials is always the key factor for laser ultrasonic detection of SPM.…”