| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
|
|---|
| Outline of Final Research Achievements |
We investigated the way of realizing high performance photoconductive antenna used in terahertz time-domain-spectroscopy based on the pulse laser working at 1.5 micrometer. In the photoconductive antennas made on low-temperature-grown GaAs which has very low noise characteristics, we enhance the nonlinear photo-absorption by utilizing surface plasmon resonance in nanometer-scale metal patterns and the Fabry-Perot resonance and eventually improve the efficiency of THz generation and sensitivity of THz detection. We clarified that by adopting a distributed Bragg reflector in the substrate, a large enhancement of light intensity can be realized in the device which can be fabricated based on the electron-beam lithography. In addition, we quantified the linear and nonlinear absorption coefficients in low-temperature-grown GaAs at 1.5 micrometer. Moreover, we clarified the device parameter dependence of the signal and noise in the photoconductive antenna made on low-temperature-grown GaAs.
|
