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권민석

Kwon, Min-Suk
Ubiquitous Photonics Lab.
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Compact Low-Loss Electroabsorption Modulator Using a Graphene-Inserted Metal-Slot-Added Waveguide

Author(s)
Seo, JihoonKwon, Min-Suk
Issued Date
2020-11
DOI
10.1109/access.2020.3036866
URI
https://scholarworks.unist.ac.kr/handle/201301/48792
Fulltext
https://ieeexplore.ieee.org/document/9252886
Citation
IEEE ACCESS, v.8, pp.203309 - 203316
Abstract
Metal slots have been used to obtain strong light-graphene interaction, which usually requires them to be a few tens of nanometers wide. However, narrow metal slot waveguides have a large intrinsic loss; they are not efficiently connected to conventional silicon photonic waveguides; they are not easy to fabricate. To address the issues, a graphene-inserted metal-slot-added (GIMSA) waveguide and an electroabsorption modulator (EAM) based on it are theoretically investigated. The GIMSA waveguide consists of a silicon strip embedded in silicon dioxide and a metal slot aligned above the silicon strip with double graphene layers between them. The EAM is composed of the GIMSA waveguide and input and output couplers connecting it to silicon photonic waveguides. In order to achieve the good performance of the EAM in terms of length and insertion loss, the GIMSA waveguide and the couplers are designed. When the silicon strip and the metal slot are respectively 320 nm and 316 nm wide, the total length of the EAM with an extinction ratio of 3 dB is 6.23 mu m, and its on-state insertion loss is 1.01 dB. Compared to previous graphene-based EAMs embedded in silicon photonic integrated circuits, this EAM is shorter and has a quite small insertion loss. The EAM's large feature size may enable fabrication using 248 nm optical lithography, and the EAM is expected to function as a compact modulator, well-integrated with silicon photonic devices.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
ISSN
2169-3536
Keyword (Author)
Integrated opticsintensity modulationnanophotonicsoptical waveguidessilicon photonicsgraphene
Keyword
PHOTONICS

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