Slowdown of light due to exciton-polariton propagation in ZnO

被引：15

作者：

Chen, S. L. ^{[1
]}

Chen, W. M. ^{[1
]}

Buyanova, I. A. ^{[1
]}

机构：

[1] Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 24期

基金：

瑞典研究理事会;

关键词：

TIME-OF-FLIGHT; BOUND EXCITON; QUANTUM-WELL; STORAGE; PULSES;

D O I：

10.1103/PhysRevB.83.245212

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By employing time-of-flight spectroscopy, the group velocity of light propagating through bulk ZnO is demonstrated to dramatically decrease down to 2044 km/s when photon energy approaches the absorption edge of the material. The magnitude of this decrease is found to depend on light polarization. It is concluded that even though the slowdown is observed in the vicinity of donor bound exciton (BX) resonances, the effect is chiefly governed by dispersion of free exciton (FX) polaritons that propagate coherently via ballistic transport. Based on the experimentally determined spectral dependence of the polariton group velocity, the polariton dispersion is accurately determined.

引用

页数：7

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