Abstract
We theoretically investigated a graphene-based silicon electro-absorption modulator in both isotropic and anisotropic graphene models. Regardless of the graphene model, the optical transmission increases with the chemical potential of graphene because of the Pauli blocking principle. However, we found that the modulator based on the isotropic graphene exhibits an abrupt decrease in transmission for the transverse-magnetic (TM) polarization mode due to the epsilon-near-zero effect in the isotropic graphene at a certain chemical potential. Conversely, the anisotropic graphenebased modulator exhibits no such transmission dip. These particular behaviors provide us with a simple and easy experimental way to confirm whether graphene is an isotropic or anisotropic material. To further enhance the transmission dip in the isotropic graphene model, we suggest a simply modified modulator structure that increases the transmission depth by ~ 0.5 dB/μm for the TM polarization mode.
Original language | English |
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Pages (from-to) | 967-972 |
Number of pages | 6 |
Journal | Journal of the Korean Physical Society |
Volume | 70 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2017 Jun 1 |
Bibliographical note
Publisher Copyright:© 2017, The Korean Physical Society.
Keywords
- Electro-absorption modulators
- Graphene photonics
- Optical waveguides
- Silicon photonics
ASJC Scopus subject areas
- General Physics and Astronomy