Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region
We demonstrate that an ultrabroadband, extremely high index of refraction can be realized from the thin window-type terahertz metamaterials composed of strongly multilayer coupled unit cells. By drastically increasing the effective permittivity by means of intense capacitive coupling and reducing th...
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IEEE
2017-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/7803575/ |
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| author | Xufeng Jing Xincui Gui Rui Xia Zhi Hong |
| author_facet | Xufeng Jing Xincui Gui Rui Xia Zhi Hong |
| author_sort | Xufeng Jing |
| collection | DOAJ |
| description | We demonstrate that an ultrabroadband, extremely high index of refraction can be realized from the thin window-type terahertz metamaterials composed of strongly multilayer coupled unit cells. By drastically increasing the effective permittivity by means of intense capacitive coupling and reducing the diamagnetic effect using a thin metamaterial structure, a peak refractive index of 70 at the resonant frequency, along with a low-frequency quasi-static value of over 18 were obtained for a single-layer thin ring terahertz metamaterial. A relative bandwidth of 0.5 THz at the index more than 20 can be observed for the single-layer thin window-type metamaterial with the refractive index peak achieving to 45. Based on the coupling effect of multilayer window-type metamatarials, the bandwidth of 1.25 THz with the index of more than 20 for the five-layer structure can be reached, and the refractive index peak reach to 50 while maintaining low losses. Importantly, the ultrabroadband performance with the bandwidth of 2.25 THz at the index larger than 20 was surprisingly indicated for multilayer coupling structure by a small incident angle. Simultaneously, the refractive index peak of more than 70 can be obtained. |
| format | Article |
| id | doaj-art-8e40b1475517457ea6cc0179d1d5d920 |
| institution | DOAJ |
| issn | 1943-0655 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-8e40b1475517457ea6cc0179d1d5d9202025-08-20T02:42:00ZengIEEEIEEE Photonics Journal1943-06552017-01-01911710.1109/JPHOT.2016.26475587803575Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz RegionXufeng Jing0Xincui Gui1Rui Xia2Zhi Hong3Institute of Optoelectronic Technology, China Jiliang University, Hangzhou, ChinaInstitute of Optoelectronic Technology, China Jiliang University, Hangzhou, ChinaInstitute of Optoelectronic Technology, China Jiliang University, Hangzhou, ChinaCentre for THz Research, China Jiliang University, Hangzhou, ChinaWe demonstrate that an ultrabroadband, extremely high index of refraction can be realized from the thin window-type terahertz metamaterials composed of strongly multilayer coupled unit cells. By drastically increasing the effective permittivity by means of intense capacitive coupling and reducing the diamagnetic effect using a thin metamaterial structure, a peak refractive index of 70 at the resonant frequency, along with a low-frequency quasi-static value of over 18 were obtained for a single-layer thin ring terahertz metamaterial. A relative bandwidth of 0.5 THz at the index more than 20 can be observed for the single-layer thin window-type metamaterial with the refractive index peak achieving to 45. Based on the coupling effect of multilayer window-type metamatarials, the bandwidth of 1.25 THz with the index of more than 20 for the five-layer structure can be reached, and the refractive index peak reach to 50 while maintaining low losses. Importantly, the ultrabroadband performance with the bandwidth of 2.25 THz at the index larger than 20 was surprisingly indicated for multilayer coupling structure by a small incident angle. Simultaneously, the refractive index peak of more than 70 can be obtained.https://ieeexplore.ieee.org/document/7803575/Electromagnetic metamaterialsterahertz metamaterials |
| spellingShingle | Xufeng Jing Xincui Gui Rui Xia Zhi Hong Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region IEEE Photonics Journal Electromagnetic metamaterials terahertz metamaterials |
| title | Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region |
| title_full | Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region |
| title_fullStr | Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region |
| title_full_unstemmed | Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region |
| title_short | Ultrabroadband Unnaturally High Effective Refractive Index Metamaterials in the Terahertz Region |
| title_sort | ultrabroadband unnaturally high effective refractive index metamaterials in the terahertz region |
| topic | Electromagnetic metamaterials terahertz metamaterials |
| url | https://ieeexplore.ieee.org/document/7803575/ |
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