Kyoto University · Physics and Astronomy
Professor Kōichiro Tanaka's research lab specializes in ultrafast nonlinear optics and terahertz science, focusing on the generation and application of intense single-cycle terahertz pulses for probing dynamic processes in condensed matter. The lab investigates nonlinear optical phenomena such as high-harmonic generation in two-dimensional materials like graphene, particularly under intense mid-infrared excitation, and explores quantum mechanical origins of coherent electron dynamics. A key focus is on understanding and manipulating light-matter interactions in semiconductors, including the dynamical Franz-Keldysh effect and coherent control of excitonic systems. The lab also engages in interdisciplinary studies linking optical physics with biomedical applications, such as cytokine production in immune cells, demonstrating a broad scientific scope from fundamental physics to biological sensing.
Figures are computed from collected data and may differ slightly.
The electronic properties of graphene can give rise to a range of nonlinear optical responses. One of the most desirable nonlinear optical processes is high-harmonic generation (HHG) originating from coherent electron motion induced by an intense light field. Here, we report on the observation of up to ninth-order harmonics in graphene excited by mid-infrared laser pulses at room temperature. The HHG in graphene is enhanced by an elliptically polarized laser excitation, and the resultant harmoni
We present a review of the recent progress in the generation methods of intense terahertz (THz) single-cycle pulses and their application to THz nonlinear spectroscopy in condensed matters. Special attentions are paid to various aspects of nonlinearity in semiconductors including dynamical Franz-Keldysh effect, ballistic acceleration of free carriers, and coherent control of the exciton system.
The in vitro production of human interleukin 1 alpha (hIL 1 alpha) and interleukin 1 beta (hIL 1 beta) by peripheral blood mononuclear cells was examined by sensitive sandwich enzyme immunoassays which could discriminate hIL 1 alpha and hIL 1 beta without cross-reaction with human IL2. In culture supernatants of mononuclear cells, two components were detected by sandwich enzyme immunoassay for hIL 1 alpha or hIL 1 beta. The molecular weight of one component was shown to be equal to that of recom
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