Figure 1

(A) Resonant phonon crystal plate produced the localized field to trap, align and sieve particles. (B) Flexible acoustic metasurface synthesized the complex holographic sound fields."

Figure 2

(A) Transcranial ULM images compared with CT on patient’s brain [55]; (B) The ULM of stroke rat compared with DWI-MRI [56]; (C) Transthoracic ULM on human’s heart [57]; (D) 3D ULM of rat heart and primate brain [58,59]; (E) Small animal high-resolution ultrasound imaging system and the acquired high-resolution structural images of the rat heart and rat brain; (F) The programmable high-frequency ultrasound imaging system and the obtained hemodynamic imaging (pictures provided by HYUS with permission)."

Figure 3

Schematic diagram of the main classifications of photoacoustic imaging techniques and their corresponding spatial resolutions [3,63,82]. (A) Photoacoustic computed tomography (PACT) is suitable for imaging at a depth of the centimeter level [83]; (B) Acoustic-resolution photoacoustic microscopy (AR-PAM) and (C) Optical-resolution photoacoustic microscopy (OR-PAM) are photoacoustic microscopic imaging techniques used for high-resolution imaging at the millimeter level and in the micrometer to sub-micrometer scale, respectively."

Figure 4

(A) A schematic of the prototype of an acoustic rectifier; (B) An acoustic Mie scatterer; (C) A passive parity-time acoustic metamaterial; (D) A unit-cell of bubble metamaterial; (E) A stretchable meta-lens for the acoustic zoom imaging; (F) Bacterial cellulose based ultrasonic metasurface with self-healing capability; (G) On-chip topological phononic crystal hosting valley states with robust edge transport; (H) On-chip elastic metasurface for high-quality SAW focusing."

Figure 5

(A) Genetically engineered bacteria manipulated in vivo using phased-array ultrasonic transducers [102]. SAW-based cell (B) sorting [103] and (C) assembly [104]. (D) 3D acoustic field construction using holographic lenses [105]."

Figure 6

(A) Measurement of cell mechanical properties using acoustic radiation forces [123]; (B) Bubble-free ultrasound transfection achieving > 81% T-cell efficiency with high activity; stem cells injected into ischemic rat models reduced infarct volume [124]."

Figure 7

(A) Acoustic-wave noninvasive BCI [138]; (B) Ultrasound modulates neuronal electrical activity through mechanosensitive ion channels to achieve ultrasound writing [139]; (C) Ultrasound decodes behavioral intentions in nonhuman primates through cerebral blood flow functional imaging [140]."