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Figure 2 | Nanoscale Research Letters

Figure 2

From: Graphene-based optical modulators

Figure 2

Possible optical transitions in graphene. (a) Optical transition in pristine graphene. (b) Optical transition in n-doped (or driven by large positive voltage) graphene. (c) Optical transition in p-doped (or driven by large negative voltage) graphene. (d) Intraband transition in graphene. Reproduced from ref. [1].

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