Table 2.
Summary of performance characteristics of fiber-based optical ultrasound transmitters.
| Absorber | Layer structure | Thickness (μm) | Fiber diameter | Pressure (MPa) | −6 dB bandwidth (MHz) | Laser power (mJ/cm2) | Measurement distance (mm) |
|---|---|---|---|---|---|---|---|
| CNTs [29] | Single-layer | — | 105 | 0.45 | 12 | 41.6 | 2 |
| CNTs [29] | Single-layer | — | 200 | 0.9 | 15 | 36.3 | 2 |
| AuNPs [35] | Single-layer | 105 | 400 | 0.64 | ~8 | 8.75 | ~1 |
| AuNPs [33] | Single-layer | ~100 | — | 0.41 | 15.1 | 55.3 | 1.5 |
| Dye [33] | Single-layer | ~50 | — | 0.9 | 4.5 | 86.3 | 1.5 |
| CNTs [30] | Multilayer | ~20 | 200 | 1.34–4.5 | 23.15–39.8 | 16.2–87.9 | 3 |