Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves
Graphene waveguide plays an important role in modulating optical signal. But it is hard to make a tradeoff between low propagating loss and high field confinement. Here, we propose a bilayer graphene waveguide in a thin topas film and a high refractive index material-germanium cladded with thin meta...
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2021-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/9350234/ |
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| author | Jinwen Huang Zhengyong Song |
| author_facet | Jinwen Huang Zhengyong Song |
| author_sort | Jinwen Huang |
| collection | DOAJ |
| description | Graphene waveguide plays an important role in modulating optical signal. But it is hard to make a tradeoff between low propagating loss and high field confinement. Here, we propose a bilayer graphene waveguide in a thin topas film and a high refractive index material-germanium cladded with thin metallic film. The influences of structural parameter and chemical potential of graphene are studied to optimize the dimension and working mode. Simulation reveals that our structure can make a balance between high figure of merit (FOM) and low propagation loss, and it reaches a high modulation depth of <inline-formula><tex-math notation="LaTeX">$\text{2.5 dB}/ \mu\text{m}$</tex-math></inline-formula>. The design can work with FOM over 200, propagation loss lower than <inline-formula><tex-math notation="LaTeX">$\text{0.2 dB}/\mu\text{m} $</tex-math></inline-formula>, and propagation length beyond <inline-formula><tex-math notation="LaTeX">$\text{30}\;\mu\text{m}$</tex-math></inline-formula> in a wide band from 6 THz to 18 THz. Compared with previous graphene waveguides, our structure operates from terahertz band to mid-infrared band, and it has longer propagation length due to the existence of bilayer graphene. Besides, benefiting from the thin metallic film, our structure can be integrated on chip. |
| format | Article |
| id | doaj-art-ba1ae6f0ce274b1e900a85269fcb538f |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-ba1ae6f0ce274b1e900a85269fcb538f2025-08-20T03:32:51ZengIEEEIEEE Photonics Journal1943-06552021-01-0113211010.1109/JPHOT.2021.30574479350234Low-Loss Graphene Waveguide Modulator for Mid-Infrared WavesJinwen Huang0Zhengyong Song1https://orcid.org/0000-0002-3575-3243Institute of Electromagnetics and Acoustics, Xiamen University, Xiamen, ChinaInstitute of Electromagnetics and Acoustics, Xiamen University, Xiamen, ChinaGraphene waveguide plays an important role in modulating optical signal. But it is hard to make a tradeoff between low propagating loss and high field confinement. Here, we propose a bilayer graphene waveguide in a thin topas film and a high refractive index material-germanium cladded with thin metallic film. The influences of structural parameter and chemical potential of graphene are studied to optimize the dimension and working mode. Simulation reveals that our structure can make a balance between high figure of merit (FOM) and low propagation loss, and it reaches a high modulation depth of <inline-formula><tex-math notation="LaTeX">$\text{2.5 dB}/ \mu\text{m}$</tex-math></inline-formula>. The design can work with FOM over 200, propagation loss lower than <inline-formula><tex-math notation="LaTeX">$\text{0.2 dB}/\mu\text{m} $</tex-math></inline-formula>, and propagation length beyond <inline-formula><tex-math notation="LaTeX">$\text{30}\;\mu\text{m}$</tex-math></inline-formula> in a wide band from 6 THz to 18 THz. Compared with previous graphene waveguides, our structure operates from terahertz band to mid-infrared band, and it has longer propagation length due to the existence of bilayer graphene. Besides, benefiting from the thin metallic film, our structure can be integrated on chip.https://ieeexplore.ieee.org/document/9350234/Graphenemodulatorplasmonicswaveguide |
| spellingShingle | Jinwen Huang Zhengyong Song Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves IEEE Photonics Journal Graphene modulator plasmonics waveguide |
| title | Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves |
| title_full | Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves |
| title_fullStr | Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves |
| title_full_unstemmed | Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves |
| title_short | Low-Loss Graphene Waveguide Modulator for Mid-Infrared Waves |
| title_sort | low loss graphene waveguide modulator for mid infrared waves |
| topic | Graphene modulator plasmonics waveguide |
| url | https://ieeexplore.ieee.org/document/9350234/ |
| work_keys_str_mv | AT jinwenhuang lowlossgraphenewaveguidemodulatorformidinfraredwaves AT zhengyongsong lowlossgraphenewaveguidemodulatorformidinfraredwaves |