| 研究概要 |
In 2013, I frstly conducted the study of cross-polarization of parabolic mirrors in terahertz spectroscopy. It was started by confronting a systematic error of the other research group in Kawase Lab. I took a deep thoughtabout the possible explanations for the error, And both real-life measurements and simulations programmed bymyself using Matlab have been carried out. As a result, I have located the problem and discovered the mechanism of polarization characteristic of parabolic mirror. The resilts have been reported in some conferences receiving good feedback, and expected to play an important role in improving the accuracy of the THz spectroscopy.
Then, I paid my attention on the other THz sensing research using metallic mesh (metafilms). The needs of identification and recognition of products have attracted great interest and motivated a large number of techniques in this field. Some techniques such as barcode, radiofyequency identfication (RFID) and quick response (QR) code are ver
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y popular. However, challenges still remains, e.g., barcode and QR code working in optic domain are easily to imitate and manifacture of RFID tags are costly. On the other hand, the rapiddevelopment in the research of metamaterials, patrticularly surface version of which known as metafilms provide an alternative type of encoding concept : aproper designed metafilm with characteristic spectrum could be used to carry information. And by taking the advantage of transparency of THz wave, metafilms working in THz-waveregion can be the solution to get rid of drawbacks of the previously described techniques and to improve confidentiality. In my work, I presented a novel design of THz metafilm for identification tag application. Both electromagnetic simulations using CST Microwave Studio and real-life measurements using THz-TDS have been conducted to verify its practicability. By varying the intersection angle between two metallic bars connecting inner circle and ring from 0 degree to 135 degrees, the peak linearly shifts from about 355GHz to 515GHz. Information can be encoded by determining the frequency where peak occurs. To increase the carriable information of such metafilm, I made more designs. By increasing a ring outside the initial design, new peakoccurred in lower frequency (about 190GHz). The results also suggested that control of peaks are irrelevant to each other and can be operated independently. 隠す
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
3: やや遅れている
理由
Because the world-widely undergoing shortage of liquid helium supply, the measurements of THzemission from humanu sing a Bolometer were delayed. In the contrary, I focused on the research of THz waveidentification. I took certain time to familiarize myself of the simulation software and a delay occurred while Iordered samples from company for real-life measurements.
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| 今後の研究の推進方策 |
For measurements of THz emission from human, the situation of shortage of liquid helium still remains and the millmeter wave source used for ahgnment was bmken. To solve that problem, I set up the recycle system for purchasing helium in our university and a new source has been bought and applied for measurements ; For research of THz-wave sensing application, I already acquired some data for publish at the moment. Thus, moremeasurements and simulations will be conducted for theoretic study as long as publishing papers and attending conference.
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