Cho David J, Wu Wei, Ponizovskaya Ekaterina, Chaturvedi Pratik, Bratkovsky Alexander M, Wang Shih-Yuan, Zhang Xiang, Wang Feng, Shen Y Ron
Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Opt Express. 2009 Sep 28;17(20):17652-7. doi: 10.1364/OE.17.017652.
We show by pump-probe spectroscopy that the optical response of a fishnet metamaterial can be modulated on the femtosecond time scale. The modulation dynamics is dominated by pump-induced changes in the constituting dielectric medium, but the strength of modulation is dramatically enhanced through the plasmon resonance. The pump-induced spectral responses of the metamaterial provide understanding on how the resonance is modified by pump excitation. Our study suggests that metamaterials can be used as high-speed amplitude/phase modulators with terahertz-bandwidth.
我们通过泵浦-探测光谱法表明，渔网超材料的光学响应可以在飞秒时间尺度上进行调制。调制动力学主要由泵浦引起的构成介电介质的变化主导，但调制强度通过等离子体共振得到显著增强。超材料的泵浦诱导光谱响应有助于理解泵浦激发如何改变共振。我们的研究表明，超材料可用作具有太赫兹带宽的高速幅度/相位调制器。
