Fig. 4. Especial Applications of HDSP.

a Simulated pressure field of multi-target image planes creating multiple spots in one shot. b Printed various spots in one shot on multi-level platform using a single acoustic hologram. c Printing in non-transparent material enabling remote distance printing (RDP) applications. d Schematic of the idea of on-invasive printing within a living organism through the RDP concept. The zoomed view details the porcine tissue layers employed in the RDP experiment. e Printed twisted helix over the barrier including porcine tissue shown in (d). Printing parameters: OD = 25 mm, P = 8 W, f₀ = 2.24 MHz, DC = 50%. f Printed maple leaf in non-transparent material as another example of RDP. Printing parameters: OD = 50 mm, P = 25 W, f₀ = 2.85 MHz, DC = 50%. g An example of overprinting possibility in HDSP, where two walls are printed over the printed hollow circular shell. The fabrication steps are shown in g1 and 2.