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Pramana

, 93:91 | Cite as

High polarisation extinction ratio of the TM-pass polariser with silicon carbide / graphene / silicon multilayers

  • Xinyu Wang
  • Wei SuEmail author
  • Xingyu Liu
Article
  • 51 Downloads

Abstract

We propose a compact TM-pass polariser, consisting of silicon (Si) / silicon carbide (SiC) / Si layers. Two graphene sheets are sandwiched between the Si and SiC layers as the interlayer to enhance the interaction with light. The loss characteristics have been investigated by using the finite-difference time-domain (FDTD) method. The proposed structure exhibits a low insertion loss (IL) of \(\sim \)0.25 \(\hbox {dB}\) and a high polarisation extinction ratio (PER) of \(\sim \)57 \(\hbox {dB}\). To verify the robustness of the proposed polariser, we analyse the fabrication tolerance of the waveguide width and the height of the Si and SiC layers. The polariser shows great fabrication error tolerance. In addition, by employing a \(100\,\mu \hbox {m}\) long waveguide, a PER of 48.3–59.4 dB is obtained in the visible regime ranging from 400 to 600 nm.

Keywords

Polariser graphene high extinction ratio 

PACS Nos

02.60.Cb 42.25.Bs 42.25.Ja 

Notes

Acknowledgements

This work was partially supported by the National Natural Science Foundation of China under Grant 61705058, Natural Science Foundation of Jiangsu Province under Grant BK20170302, Changzhou Science and Technology Program under Grant CJ20179023 and Fundamental Research Fund for Central Universities of China under Grant 2019B21314.

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  1. 1.Department of Mathematics and PhysicsHohai UniversityChangzhouChina
  2. 2.College of Mechanical and Electrical EngineeringHohai UniversityChangzhouChina

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