京都大学 · 物理学・天文学
Kōichiro Tanaka教授の研究室では、グラフェンをはじめとする次世代半導体材料を用いた非線形光物理学の研究が進められています。特に、中赤外レーザーを用いた高次高調波生成や、強力なテラヘルツパルスを用いた物質の非線形応答の解明が主なテーマです。これらの研究は、量子力学的記述に基づく高精度な理論モデルと実験の融合によって、新しい光応用技術の創出を目指しています。
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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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