2017 Fiscal Year Research-status Report
Real-time THz wave near-field camera with metamaterial devices
| Project/Area Number |
17K18368
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
Han Zhengli 国立研究開発法人理化学研究所, 光量子工学研究領域, 基礎科学特別研究員 (20752702)
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| Project Period (FY) |
2017-04-01 – 2019-03-31
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| Keywords | film metamaterial device / double-layer pattern |
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| Outline of Annual Research Achievements |
Metamaterial with double-layer split ring resonators (SRRs) was proposed for the terahertz (THz)-wave near-field imaging system. During this year, the film metamaterial device was developed by photo-lithography technique. We used THz TDS (THz time domain spectroscopy) to test the device spectra performance, which is well agreed with the simulation. A novel THz-wave phase shifter based on the film metamaterial with double-layer metallic patterns was also investigated. We analyze the effects introduced by the near-field coupling between the double-layer metallic patterns and the mechanism of the high transmission of the THz-wave phase shifter. The near-field coupling plays an important role in the THz-wave device performance, and it is also a key factor in the THz-wave near-field imaging.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Metamaterial with double-layer split ring resonators (SRRs) was proposed for the terahertz (THz)-wave near-field imaging system. One of the key factors for this work is the metamaterial design and device process. In this financial year, near-field coupling between the double-layer metallic patterns was investigated for understanding the metamaterial design. For the device process, film substrate was employed to accommodate the double-layer SRRs. Film metamaterial with thcikness around 50 micron and area of 5 cm * 5 cm was obtained. This provides sufficient preparation for the next step research work.
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| Strategy for Future Research Activity |
The research topic is using metamaterial with double-layer split ring resonators to build a THz-wave near-field imaging system. We developed the film metamaterial device, investigated the near-field coupling mechanism of the double-layer metallic patterns and published a work based on this analysis. Those are important steps towards the final target of the near-field imaging system. The work in 2018 will mainly focus on the THz-wave optics for near-field imaging setup, and meanwhile I will also investigate the potential ability of film metamaterial for functional THz-wave devices.
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| Causes of Carryover |
Last fiscal year, research work mainly focus on the film metamateiral device design and process, for which the budget mainly spent on the clean room usage. Next fiscal year, device measurement and imaging system will be conducted. For the imaging system setup, nonlinear crystal and optical components are needed. Budget will be spent on several items. 1. material purchase. 2. Journal paper publication. 3. International conference registration and trip.
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