标题：Optical precursors with competing linear and nonlinear dispersions in quantum dot molecules
作者：Peng, Yandong; Yang, Aihong; Chen, Bing; Xu, Yan; Zhang, Luyin
作者机构：[Peng, Yandong; Yang, Aihong; Chen, Bing; Xu, Yan; Zhang, Luyin] Shandong Univ Sci & Technol, Dept Appl Phys, Qingdao 266590, Shandong, Peoples R Chin 更多
通讯作者地址：[Peng, YD]Shandong Univ Sci & Technol, Dept Appl Phys, Qingdao 266590, Shandong, Peoples R China.
来源：PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
关键词：Tunneling induced transparency; Self-Kerr nonlinearity; Optical; precursor; Normal dispersion; Anomalous dispersion
摘要：We theoretically investigate coherent control of optical precursors in quantum-dot molecules by voltage-controlled tunneling. When the probe field is weak, the linear susceptibility shows normal dispersion. The main signal is delayed due to slow-light effect and optical precursors are separated from the incident pulse. As increase of the probe-field intensity, the nonlinearity arises. The enhanced self-Kerr nonlinearity exhibits anomalous dispersion, then the main signal is accelerated and constructively interferes with the precursors, so a strong transient pulse appears. Simulation result shows that its peak value is about one order of magnitude larger than that of the incident pulse. The competition between the linear and nonlinear dispersions contributes to the separation and enhancement of the optical precursors. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.