Mechanically tunable metamaterials terahertz dual-band bandstop filter
We experimentally demonstrate a mechanically tunable metamaterials terahertz（THz） dual-band bandstop filter. The unit cell of the filter contains an inner aluminum circle and an outside aluminum Ohm-ring on high resistance silicon substrate. The performance of the filter is simulated by finite-integ...
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| Published in | Chinese physics B Vol. 26; no. 7; pp. 183 - 187 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
01.06.2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1674-1056 2058-3834 |
| DOI | 10.1088/1674-1056/26/7/074219 |
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| Summary: | We experimentally demonstrate a mechanically tunable metamaterials terahertz（THz） dual-band bandstop filter. The unit cell of the filter contains an inner aluminum circle and an outside aluminum Ohm-ring on high resistance silicon substrate. The performance of the filter is simulated by finite-integration-time-domain（FITD） method. The sample is fabricated using a surface micromachining process and experimentally demonstrated using a THz time-domain-spectroscopy（TDS） system. The results show that, when the incident THz wave is polarized in y-axis, the filter has two intensive absorption peaks locating at 0.71 THz and 1.13 THz, respectively. The position of the high-frequency absorption peak and the amplitude of the low-frequency absorption peak can be simultaneously tuned by rotating the sample along its normal axis.The tunability of the high-frequency absorption peak is due to the shift of resonance frequency of two electrical dipoles,and that of the low-frequency absorption peak results from the effect of rotationally induced transparent. This tunable filter is very useful for switch, manipulation, and frequency selective detection of THz beam. |
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| Bibliography: | metamaterials; terahertz（THz） bandstop filter; mechanically tunable; rotationally induced transparent（RIT） Fangrong Hu1,3,Xin Xu1,Peng Li1,Xinlong Xu2,Yue＇e Wang1 （ 1Guangxi Colleges and Universities Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China; 2 Nanobiophotonic Center, State Key Laboratory Incubation Base of Photoelectric Technology and Functional Materials, and Institute of Photonics ＆ Photon-Technology, Northwest University, Xi＇ an 710069, China; 3 Guangxi Experiment Center of Information Science, Guilin University of Electronic Technology, Guilin 541004, China） 11-5639/O4 We experimentally demonstrate a mechanically tunable metamaterials terahertz（THz） dual-band bandstop filter. The unit cell of the filter contains an inner aluminum circle and an outside aluminum Ohm-ring on high resistance silicon substrate. The performance of the filter is simulated by finite-integration-time-domain（FITD） method. The sample is fabricated using a surface micromachining process and experimentally demonstrated using a THz time-domain-spectroscopy（TDS） system. The results show that, when the incident THz wave is polarized in y-axis, the filter has two intensive absorption peaks locating at 0.71 THz and 1.13 THz, respectively. The position of the high-frequency absorption peak and the amplitude of the low-frequency absorption peak can be simultaneously tuned by rotating the sample along its normal axis.The tunability of the high-frequency absorption peak is due to the shift of resonance frequency of two electrical dipoles,and that of the low-frequency absorption peak results from the effect of rotationally induced transparent. This tunable filter is very useful for switch, manipulation, and frequency selective detection of THz beam. |
| ISSN: | 1674-1056 2058-3834 |
| DOI: | 10.1088/1674-1056/26/7/074219 |