标题：Ultranarrow linewidth and high gain of an optical cavity with enhanced self-Kerr nonlinearity in quantum dot molecules
作者：Peng, Yandong; Yang, Aihong; Li, Dehua; Zhang, Huig; Niu, Yueping; Gong, Shangqing
作者机构：[Peng, Yandong; Yang, Aihong; Li, Dehua; Zhang, Huig] Shandong Univ Sci & Technol, Coll Elect Commun & Phys, Dept Appl Phys, Qingdao 266590, Peoples R 更多
通讯作者地址：[Peng, YD]Shandong Univ Sci & Technol, Coll Elect Commun & Phys, Dept Appl Phys, Qingdao 266590, Peoples R China.
来源：LASER PHYSICS LETTERS
关键词：tunneling induced transparency; self-Kerr nonlinearity; cavity; linewidth; dispersion; gain
摘要：The enhanced self-Kerr nonlinearity of quantum dot molecules may be used to realize optical cavities with an ultranarrow linewidth and high gain. The resonant tunneling induces constructive interference for the self-Kerr nonlinearity, and then a narrow gain window with large normal dispersion appears with frequency detuning. The competition between linear and nonlinear dispersion leads to strong normal dispersion of the total susceptibility, which significantly narrows the cavity linewidth; the nonlinear gain introduces the total gain effects contributing to high transmission. Simulation results show that the cavity linewidth could be narrowed by nearly 30 times and the transmission peak enhanced about 40 times compared with a linear case.