Table 1.
Summary of performance characteristics of planar optical ultrasound transmitters.
| Absorber | Layer structure | Thickness (μm) | Pressure (MPa) | −6 dB bandwidth (MHz) | Laser power (mJ/cm2) | Measurement distance (mm) |
|---|---|---|---|---|---|---|
| Carbon black [24] | Single-layer | 25 | 0.15 | ~40 | 10.4 | 10 |
| Carbon black [25] | Single-layer | 11 | 0.8 | ~20 | — | — |
| AuNPs [34] | Single-layer | 80–1000 | 0.01–0.189 | ~4 | 3.67–13 | 1.8 |
| CNTs [28] | Multilayer | 2.6 | — | ~80 | 3 mW/cm2 | 1.4 |
| CNFs [31] | Multilayer | 57.9 | 12.15 | 7.63 | 3.71 | 3.65 |
| rGO [27] | Multilayer | 11.1 | 0.5 | ~60 | 35.66 | — |
| AuNP Array [32] | Multilayer | ~4.5 | 0.5 | ~65 | 50.9 | 10 |