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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