Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip
A terahertz multifunction modulator composed of upper-layer double graphene ribbons and lower-layer a graphene strip, which can generate a Fano resonance produced by hybrid between a broad mode and a narrow mode, is proposed to realize electro-optical switch and filtering function. The electric fiel...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2020-01-01
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| Series: | New Journal of Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/1367-2630/ab83d5 |
| _version_ | 1797750191849209856 |
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| author | Zhimin Liu Enduo Gao Xiao Zhang Hongjian Li Hui Xu Zhenbin Zhang Xin Luo Fengqi Zhou |
| author_facet | Zhimin Liu Enduo Gao Xiao Zhang Hongjian Li Hui Xu Zhenbin Zhang Xin Luo Fengqi Zhou |
| author_sort | Zhimin Liu |
| collection | DOAJ |
| description | A terahertz multifunction modulator composed of upper-layer double graphene ribbons and lower-layer a graphene strip, which can generate a Fano resonance produced by hybrid between a broad mode and a narrow mode, is proposed to realize electro-optical switch and filtering function. The electric field distribution, hybrid theory, and quantum level theory are all employed to explain the Fano resonance, whose transmission spectra are fitted by coupled mode theory. In comparison to other graphene-based terahertz modulators, the amplitude modulation degree can reach 99.57%, meaning an excellent electro-optical switch can be realized. Moreover, the extinction ratio of Fano resonance can reach 99.70%, demonstrating an unparalleled electro-optical filter is implemented. Finally, variations in the lateral and longitudinal lengths of the lower-layer a graphene strip enable excellent dual-band, triple-band filters. Thus, this work provides a new way to implement terahertz multi-function modulators. |
| first_indexed | 2024-03-12T16:29:09Z |
| format | Article |
| id | doaj.art-149a455c428847419379f00ae27473e5 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:29:09Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-149a455c428847419379f00ae27473e52023-08-08T15:33:49ZengIOP PublishingNew Journal of Physics1367-26302020-01-0122505303910.1088/1367-2630/ab83d5Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene stripZhimin Liu0https://orcid.org/0000-0003-4351-0193Enduo Gao1Xiao Zhang2Hongjian Li3https://orcid.org/0000-0003-0714-0594Hui Xu4Zhenbin Zhang5Xin Luo6https://orcid.org/0000-0003-4282-9426Fengqi Zhou7School of Science, East China Jiaotong University , Nanchang 330013, People’s Republic of China; Department of Materials Science and Engineering, The Ohio State University , 2041 College Road, Columbus, OH 43210, United States of AmericaSchool of Science, East China Jiaotong University , Nanchang 330013, People’s Republic of ChinaSchool of Science, East China Jiaotong University , Nanchang 330013, People’s Republic of ChinaSchool of Physics and Electronics, Central South University , Changsha, 410013, People’s Republic of ChinaSchool of Mathematics and Statistics, Hunan University of Technology and Business , Changsha 410205, People’s Republic of ChinaSchool of Science, East China Jiaotong University , Nanchang 330013, People’s Republic of ChinaSchool of Science, East China Jiaotong University , Nanchang 330013, People’s Republic of ChinaSchool of Science, East China Jiaotong University , Nanchang 330013, People’s Republic of ChinaA terahertz multifunction modulator composed of upper-layer double graphene ribbons and lower-layer a graphene strip, which can generate a Fano resonance produced by hybrid between a broad mode and a narrow mode, is proposed to realize electro-optical switch and filtering function. The electric field distribution, hybrid theory, and quantum level theory are all employed to explain the Fano resonance, whose transmission spectra are fitted by coupled mode theory. In comparison to other graphene-based terahertz modulators, the amplitude modulation degree can reach 99.57%, meaning an excellent electro-optical switch can be realized. Moreover, the extinction ratio of Fano resonance can reach 99.70%, demonstrating an unparalleled electro-optical filter is implemented. Finally, variations in the lateral and longitudinal lengths of the lower-layer a graphene strip enable excellent dual-band, triple-band filters. Thus, this work provides a new way to implement terahertz multi-function modulators.https://doi.org/10.1088/1367-2630/ab83d5terahertzFano resonanceswitchfiltermulti-functional modulator |
| spellingShingle | Zhimin Liu Enduo Gao Xiao Zhang Hongjian Li Hui Xu Zhenbin Zhang Xin Luo Fengqi Zhou Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip New Journal of Physics terahertz Fano resonance switch filter multi-functional modulator |
| title | Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip |
| title_full | Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip |
| title_fullStr | Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip |
| title_full_unstemmed | Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip |
| title_short | Terahertz electro-optical multi-functional modulator and its coupling mechanisms based on upper-layer double graphene ribbons and lower-layer a graphene strip |
| title_sort | terahertz electro optical multi functional modulator and its coupling mechanisms based on upper layer double graphene ribbons and lower layer a graphene strip |
| topic | terahertz Fano resonance switch filter multi-functional modulator |
| url | https://doi.org/10.1088/1367-2630/ab83d5 |
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