2019 Fiscal Year Annual Research Report
Tunable narrowband thermal emitter for minimization of disease screening device
| Project/Area Number |
19J13668
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| Research Institution | The University of Tokyo |
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Principal Investigator |
王 智宇 東京大学, 工学系研究科, 特別研究員(DC2)
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| Project Period (FY) |
2019-04-25 – 2021-03-31
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| Keywords | thermal emission / ultra-narrow bandwidth / tunable wavelength / mid-infrared |
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| Outline of Annual Research Achievements |
1. Finalize a publication (under review) about a wavelength-selective thermal emitter with wavelength tunability. The quality factor of the reported structure is one order above our previous work. The tunability property for such a structure is reported.
2. The properties of the proposed wavelength-selective thermal emitter are further improved using deep learning.
3. Finally, a new design for a hot carrier photodetector has been reported and verified experimentally. It is the first experimental result of a photodetector based on Tamm plasmons. These results are published in Nanoscale.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Within this year, we have conducted the optimization, simulation, fabrication, and experiment processes.
The device has a multilayer configuration. We demonstrated a pronounced resonance peak in emittance spectrum with a quality factor (Q-factor) as large as 1908. Wavelength tunability was realized by taking advantage of its thermo-optic effect. The device has been fabricatedusing RF sputtering. Upon heating, sharp peak is observed in the emittance spectrum with a large Q-factor around 780. The emission peak wavelength can be tuned within a range of 4.6 times the bandwidth of the emittance peak by adjusting the temperature. Both the Q-factor and tunabilities show larger values than that of any other tunable thermal emitters which have been reported.
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| Strategy for Future Research Activity |
In the future, we consider to use deep learning techniques to design the optical behavior of a thermal emitter. Thus, many optical behaviors that is difficult to be achieved, such as arbitrarily design of double emission peaks and a minimum total thickness of a multilayer structure could be expected.
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