Journal
OPTICS LETTERS
Volume 41, Issue 11, Pages 2501-2504Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.002501
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Burroughs Wellcome Fund (BWF)
- Konica Minolta Imaging Science Foundation
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We present a graphene-on-silicon (GoS) suspended vertical slot waveguide. By changing the Fermi level of graphene, the variation in the effective refractive index (RI) of the waveguide is a factor of two larger than that in the traditional GoS rib waveguide. The improvement is due to the light-intensity enhancement and the poor confinement of the optical mode in the slot nanostructure. We designMach-Zehnder interferometer (MZI) and microring modulators based on the GoS suspended vertical slot waveguide. Our calculations show that the modulators can be energy-efficient and footprint-compact due to the large phase shift of the propagating mode in the waveguide after applying a gate voltage on the graphene. Fabrication of our design is easy and CMOS-compatible. It paves the way for chip-integrated electronic-RI modulators. (C) 2016 Optical Society of America
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