Journal
OPTICS EXPRESS
Volume 19, Issue 21, Pages 20808-20816Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.020808
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Funding
- National Keystone Basic Research Program (Program 973) [2007CB310408]
- National Natural Science Foundation of China [10804077, 10904098, 11011120242]
- Beijing Municipal Commission of Education [KM200910028006, KM201110028004]
- Ministry of Education [210002]
- Beijing Nova Program
- Funding Project for Academic Human Resources Development in Institutions of Higher Learning Under the Jurisdiction of the Beijing Municipality
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This paper describes detailed optical-pump-terahertz-probe studies of two-dimensional photonic crystal slabs for propagation perpendicular to the slabs. When the slabs are excited by an 800 nm pump pulse and the effect of shielding by photocarriers is removed, we find that the decaying tail in the transmitted terahertz radiation is strikingly enhanced. The photocarriers weaken guided resonances, but they also greatly enhance the excitation efficiency of guided resonances and the ability of the guided resonances to transfer energy back to the radiation field. This increases the resonance-assisted contribution to transmitted field. The photoinduced resonant extremes agree well with the Fano model. (C) 2011 Optical Society of America
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