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권민석

Kwon, Min-Suk
Ubiquitous Photonics Lab.
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Mid-infrared subwavelength modulator based on grating-assisted coupling of a hybrid plasmonic waveguide mode to a graphene plasmon

Author(s)
Kim, YonghanKwon, Min-Suk
Issued Date
2017-11
DOI
10.1039/c7nr07045d
URI
https://scholarworks.unist.ac.kr/handle/201301/23024
Fulltext
http://pubs.rsc.org/en/Content/ArticleLanding/2017/NR/C7NR07045D
Citation
NANOSCALE, v.9, no.44, pp.17429 - 17438
Abstract
This work reports a mid-infrared modulator based on a hybrid plasmonic waveguide with graphene on a grating in its slot region. The modulator utilizes a graphene plasmon for electro-optic tuning in a more practical and effective way than graphene-plasmon-based waveguide devices studied up to now. The hybrid plasmonic waveguide can be easily and efficiently integrated with input and output photonic waveguides. It supports a hybrid plasmonic waveguide mode and a graphene-plasmon-based waveguide mode. Grating-assisted coupling of the former to the latter in it is demonstrated to work successfully even though the two modes have significantly different propagation constants and losses. Theoretical investigation of the modulator shows that the coupling via the grating of length 5.92 mu m generates a deep rejection band at a wavelength of 8.014 mu m in the transmission spectrum of the output photonic waveguide of the modulator. With the graphene chemical potential tuned between 0.6 eV and 0.65 eV, the transmission at the wavelength is modulated between -27 dB and -1.8 dB. The subwavelength modulator, which may have a large bandwidth and small energy consumption, is expected to play a key role in free-space communications and sensing requiring mid-infrared integrated photonics.
Publisher
ROYAL SOC CHEMISTRY
ISSN
2040-3364
Keyword
QUANTUM CASCADE LASERSOPTICAL-PROPERTIESZINC-SULFIDEREFRACTIVE-INDEXESWAVELENGTH RANGESURFACE-PLASMONTHIN-FILMSILICONGERMANIUMPHOTONICS

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