Chip-integrated nearly perfect absorber at telecom wavelengths by graphene coupled with nanobeam cavity

We exploit the concept of critical coupling to graphene based chip-integrated applications and numerically demonstrate that a chip-integrated nearly perfect graphene absorber at wavelengths around 1.55 μm can be obtained by graphene nearly critical coupling with a nanobeam cavity. The key points are...

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Bibliographic Details
Published inOptics letters Vol. 40; no. 14; p. 3256
Main Authors Xu, W, Zhu, Z H, Liu, K, Zhang, J F, Yuan, X D, Lu, Q S, Qin, S Q
Format Journal Article
LanguageEnglish
Published United States 15.07.2015
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Summary:We exploit the concept of critical coupling to graphene based chip-integrated applications and numerically demonstrate that a chip-integrated nearly perfect graphene absorber at wavelengths around 1.55 μm can be obtained by graphene nearly critical coupling with a nanobeam cavity. The key points are reducing the radiation loss and transmission possibly, together with controlling the coupling rate of the cavity to the input waveguide to be equal to the absorption rate of the cavity caused by graphene. Simulation results show that the absorption of monolayer graphene with a total length of only a few microns is raised up to 97%. Our study may have potential applications in chip-integrated photodetectors.
ISSN:1539-4794
DOI:10.1364/OL.40.003256