Shi Yulei, Zhou Qing-Li, Liu Wei, Zhang Cunlin
Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory for Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing 100048, China.
Opt Express. 2011 Oct 10;19(21):20808-16. doi: 10.1364/OE.19.020808.
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.
本文描述了对二维光子晶体平板进行垂直于平板传播的详细光泵太赫兹探测研究。当平板由800nm泵浦脉冲激发且去除光生载流子的屏蔽效应时，我们发现透射太赫兹辐射中的衰减尾部显著增强。光生载流子削弱了导模共振，但它们也极大地提高了导模共振的激发效率以及导模共振将能量转移回辐射场的能力。这增加了共振辅助对透射场的贡献。光致共振极值与法诺模型吻合良好。
