Bragg diffraction of microcavity polaritons by a surface acoustic wave.
Bragg diffraction of microcavity polaritons by a surface acoustic wave.
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DOI：
10.1103/physrevlett.94.226406
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发表时间：
2005-03
影响因子：
8.6
通讯作者：
Kikuo Cho;K. Okumoto;N. Nikolaev;A. Ivanov
中科院分区：
文献类型：
--
作者：
Kikuo Cho;K. Okumoto;N. Nikolaev;A. Ivanov
相干声波引起的极化子布拉格散射是由分别与带内和带间跃迁中的声场和光场共振的激子态介导和强烈增强的。在这种情况下，与传统的声光相比，共振增强的布拉格光谱揭示了衍射光的多级。对于由 nu(SAW)=1 GHz 和 I(ac)< 或大约 100 W/cm(2) 的表面声波驱动的 GaAs 微腔中的极化激元，主要声感应带隙可以大到约等于 0.6 meV 的 Delta(MC)(ac)，并且可以观察到高达 n=3 的布拉格复制品。
Bragg scattering of polaritons by a coherent acoustic wave is mediated and strongly enhanced by the exciton states resonant with the acoustic and optic fields in the intraband and interband transitions, respectively. In this case, in contrast with conventional acousto-optics, the resonantly enhanced Bragg spectra reveal the multiple orders of diffracted light. For polaritons in GaAs microcavities driven by a surface acoustic wave of nu(SAW)=1 GHz and I(ac)< or approximately 100 W/cm(2) the main acoustically induced band gap can be as large as Delta(MC)(ac) approximately equal to 0.6 meV and the Bragg replicas up to n=3 can be observed.