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Acta Physica Sinica

TUNNEL BROADENING EFFECT ON INTERSUBBAN OOPTICAL SATURATION INS UPERLATTICES

Pan Shao-hua,Feng Si-min,Cui Da-fu

Published Jan 1, 1991• 0 citations
Publisher

Abstract

摘要 本文运用Kroning-Penney 模型新形式, 研究超晶格子带间光吸收的三阶非线性效应, 发现不论量子阱参数(如阱宽、垒宽和垒高等)如何改变, 光吸收饱和强度与隧穿谱宽之间存在着一种较普遍的关系, 并阐明了这种依从关系的物理机制. Abstract By means of a new formalism of the Kronig-Ponney model developed recently, the third order nonlinear optical effect of intersubband transition In superlattices is studied. It is shown that there is a general relation between optical saturation intensity and tunnel bandwidth. The physical mechanism of this relation is analyzed. 作者及机构信息 潘少华;冯思民;崔大复;杨国祯 1. 中国科学院物理研究所, Authors and contacts Pan Shao-hua Feng Si-min Cui Da-fu Yan Guo-zhen 参考文献 施引文献

DOI
10.7498/aps.40.1074

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Acta Physica Sinica•Jan 1, 1995•0 citations
摘要 本文运用Kroning-Penney 模型新形式, 研究超晶格子带间光吸收的三阶非线性效应, 发现不论量子阱参数(如阱宽、垒宽和垒高等)如何改变, 光吸收饱和强度与隧穿谱宽之间存在着一种较普遍的关系, 并阐明了这种依从关系的物理机制. Abstract By means of a new formalism of the Kronig-Ponney model developed recently, the third order nonlinear optical effect of intersubband transition In superlattices is studied. It is shown that there is a general relation between optical saturation intensity and tunnel bandwidth. The physical mechanism of this relation is analyzed. 作者及机构信息 潘少华;冯思民;崔大复;杨国祯 1. 中国科学院物理研究所, Authors and contacts Pan Shao-hua Feng Si-min Cui Da-fu Yan Guo-zhen 参考文献 施引文献
In the past few years advance in nanofabrication techniques have made it possible to make well-like compound semiconductor structures of low nanometer size.In these structures,the state of the electron in the direction perpendicular to the length of the well is quantized with sufficiently large separation in energy levels and the motion of the electron parallel to the length is that of a quasi-free electron.One of the most remarkable properties of these one-dimensional electron system is that the optical transitions between the size-quantized subbands are feasible.The result shows there is a large optical nonlinearities in asymmetric quantum wells.The problem of optical saturation of intersubband absorption has recently attracted considerable attention.The problem is very important to the development of superlattice devices such as fast infrared detectors and(modulators) because one needs to know the range of input optical intensities for which linear operation is(possible.) The analytical expression of the linear and the third-order nonlinear optical intersubband absorption coefficients are obtained in Pschl-Teller wells using the density matrix formalism taking into account the(intrasubband) relaxation.Since there are two adjustable parameters κ and λ in Pschl-Teller wells,the shapes of the wells will change with the change of the parameters κ and λ,accordingly the linear and the third-order nonlinear optical absorption coefficients will change with the parameters κ and λ.It is shown that the optical absorption coefficient depends on the parameter,and the optical intensity strongly. The absorption saturation will occur with I increase.Numerical results are presented for a typical AlGaAs/GaAs Pschl-Teller well.
摘要 利用染料分子带模型,探讨了染料环形腔系统的光学双稳特性,得到光学双稳可在一个比较大的频率范围内实现;其双稳区域是染料分子带结构参数(带宽及偶极分布的Lorentzian宽度等)的函数. Abstract The optical bistability in a dye ring cavity has been investigated. It is shown that the bistability can be realized in a much wider frequency range, and that the bistable regions are functions of the band structures (the bandwidth and the distri-bution of dipole moments). 作者及机构信息 龚尚庆1, 徐至展1, 潘少华2, 杨国桢2 (1)中国科学院上海光学精密机械研究所; (2)中国科学院物理研究所 Authors and contacts GONG SHANG-QING1, XU ZHI-ZHAN1, PAN SHAO-HUA2, YANG GUO-ZHEN2 (1)中国科学院上海光学精密机械研究所; (2)中国科学院物理研究所 参考文献 施引文献
摘要 考虑具有一相干驱动场的简单三能级原子模型,探讨该系统的色散、吸收特性,得到在强相干驱动场条件下,可导致该介质对弱探测场的透明;该三能级原子系统能够用来产生一超大折射率. Abstract 作者及机构信息 龚尚庆1, 徐至展1, 潘少华2 (1)中国科学院上海光学精密机械研究所,上海201800; (2)中国科学院物理研究所,北京100080 Authors and contacts Gong Shang-Qing1, Xu Zhi-Zhan1, Pan Shao-Hua2 (1)中国科学院上海光学精密机械研究所,上海201800; (2)中国科学院物理研究所,北京100080 参考文献 施引文献