Table 4
Recent progress of graphene-silicon TO devices
| Structure and reference | Tuning efficiency (nm mW−1) | Response time (μs) | Spacer |
| Graphene on Si micro-ring [58] | 0.104 | 0.75 | No |
| Graphene on Si racetrack-type resonator [59] | 0.24 | 1.2 | No |
| Graphene on Si micro-disk [60] | 1.67 | 12.8 | No |
| Graphene on Si PhC [38] | 1.07 | 0.75 | No |
| Graphene on Si nanobeam [39] | 1.5 | 1.47 | No |
| Graphene on Si micro-ring [37] | 0.33 | 3 | Yes |
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