2014 Fiscal Year Annual Research Report
単色・広帯域周波数可変（0.3～3THz）固有ジョセフソン連続波発振器
| Project/Area Number |
25289108
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| Research Institution | National Institute for Materials Science |
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Principal Investigator |
WANG Huabing 国立研究開発法人物質・材料研究機構, 超伝導物性ユニット, 主幹研究員 (70421427)
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| Co-Investigator(Kenkyū-buntansha) |
羽多野 毅 国立研究開発法人物質・材料研究機構, 超伝導物性ユニット, 特別研究員 (50354337)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | マイクロ波 / ミリ波 / テラヘルツ波 |
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| Outline of Annual Research Achievements |
In our previous experiments, we have found that hotspot induced by self-heating has two sides of functions. The advantage is that the hotspot is helpful for synchronizing THz emission from hundreds or thousands individual junctions, however, it also has disadvantage. The self-heating will reduce the junction voltage, so as to the emission frequency. In this fiscal year, we developed a sandwich structure, with which the heating can be handled in a proper way. The emission frequency range can cover 0.3 to 1.05 THz (the previous one was only 0.43 to 0.82 THz), and operation temperature rises to 85 K.. Therefore, it is possible to operate the THz emitter in liquid nitrogen.
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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
予定通り順調に進んでいたが、性能の向上に伴いさらにTHz発振位相整合実験及びTHz帯SIS受信機の開発実験等が必要になったためこの件に関しては次年度まで引き続き継続することとなった。
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| Strategy for Future Research Activity |
1. To further understand the mechanism, we plan to utilize low temperature scanning laser microscopy (LTSLM) to visualize the EM resonance modes inside the THz emitter, and detected the emission outside the THz emitter simultaneously.
2. To manipulate the THz emitters, we will develop THz emitters with new structures. We also plan to use LTSLM to local heat the sample with a focused laser beam.
3. To make the THz emitters practically useful, we will fabricate a THz flash which can be driven by a 1.5 V battery. The operation can be in liquid nitrogen.
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