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Kwon, Min-Suk
Ubiquitous Photonics Laboratory (UP Lab)
Research Interests
  • Photonics, plasmonics, waveguides, planar lightwave circuits

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Discussion of the Epsilon-Near-Zero Effect of Graphene in a Horizontal Slot Waveguide

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Title
Discussion of the Epsilon-Near-Zero Effect of Graphene in a Horizontal Slot Waveguide
Author
Kwon, Min-Suk
Keywords
Waveguide devices; optical properties of photonic materials; graphene
Issue Date
201406
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE PHOTONICS JOURNAL, v.6, no.3, pp.1 - 9
Abstract
Horizontal slot waveguides based on graphene have been considered an attractive structure for optical waveguide modulators for transverse magnetic (TM) modes. Graphene is embedded in the slot region of a horizontal slot waveguide. If graphene were treated as an isotropic material and its dielectric constant were made close to zero by adjusting its Fermi level, the surface-normal electric field component of the fundamental TM mode of a horizontal slot waveguide might be highly enhanced in graphene. This could cause a large increase in the attenuation coefficient of the mode. This is called the epsilon-near-zero (ENZ) effect. This paper discusses that graphene needs to be treated as an anisotropic material that has an almost real surface-normal dielectric constant component. Then, the ENZ effect does not exist. Approximate analytic expressions and numerical simulation are used for the discussion, and they demonstrate that horizontal slot waveguides are not appropriate for graphene-based modulators for TM modes
URI
http://scholarworks.unist.ac.kr/handle/201301/6417
DOI
http://dx.doi.org/10.1109/JPHOT.2014.2326667
ISSN
1943-0655
Appears in Collections:
ECE_Journal Papers
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