| 研究実績の概要 |
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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| 今後の研究の推進方策 |
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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