期刊
OPTICS LETTERS
卷 37, 期 17, 页码 3510-3512出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.37.003510
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资金
- Photon Frontier Network Program
- Global COE Program the Physical Sciences Frontier
- Special Coordination Funds for Promoting Science and Technology of the Ministry of Education, Culture, Sports, Science and Technology, Japan
- KAKENHI [20104002]
- Research Fellowships for Young Scientist from the Japan Society for the Promotion of Science (JSPS)
- Grants-in-Aid for Scientific Research [20104002] Funding Source: KAKEN
We investigated the dynamics of photo-induced optical activity of metal chiral gratings on an Si substrate for terahertz (THz) waves. We employed a new technique that enables optical-pump and THz-probe measurements via broadband THz spectroscopy at the microsecond time scale using a low-repetition-rate pump and a high-repetition-rate probe. We revealed that the THz optical activity decays as a result of the carrier diffusion effect because this optical activity is because of the presence of three-dimensional chiral structures of photo-carriers in the Si substrate. (c) 2012 Optical Society of America
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