| Budget Amount *help |
¥41,210,000 (Direct Cost: ¥31,700,000、Indirect Cost: ¥9,510,000)
Fiscal Year 2017: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Fiscal Year 2015: ¥13,780,000 (Direct Cost: ¥10,600,000、Indirect Cost: ¥3,180,000)
Fiscal Year 2014: ¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
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| Outline of Final Research Achievements |
In order to observe extreme nonlinear optical phenomena in solids, we have constructed two high-intensity terahertz light sources: one is a short pulse source which spectrum includes high frequency components over 20 THz and the other is a tunable narrow-bandwidth (< 0.1 THz) source with peak frequency of about 1 THz. With the tunable THz light source, we have confirmed a huge Rabi-splitting of 1s exciton level and sub-cycle light modulation in the exciton absorption. With high frequency source with 60 THz in peak energy, we observed high-harmonic generation in monolayer MoS2 and graphene for the first time. The high harmonics generation has unique properties that comes from solid state nature of electrons, which is quite different from that of the atomic gas system. We proposed theoretical models for these extreme nonlinear effects in solids.
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