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Acta Physica Sinica

TUNNEL BROADENING EFFECT ON INTERSUBBAND OPTICAL SATURATION IN SUPERLATTICES

PAN SHAO-HUA, FENG SI-MIN, Cui Dafu, Yang Guo-Zhen, (1)中国高等科学技术中心(世界实验室); (2)中国科学院物理研究所,北京,100080

Published Jan 1, 1993• 0 citations
Publisher

Abstract

By means of a new formalism of the Kronig-Penney model developed recently, the third order nonlinear optical effect of intersubband transitions 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.
DOI
10.7498/aps.42.1074-2

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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.
In multiple quantum wells system, a large dipole strength and a narrow band width were observed. This suggests that the intersubband optical transitions in a quantum well may have very large optical nonlinearities. The intersubband transition have potential for device applications in far-infrared laser amplifiers, photodetectors and high-speed electrooptical modulators. In device design, the region of input optical density for linear response is a very important parameter. And the optical saturation is related with tunnelling effects and the intersubband relaxations. So the intersubband nonlinear absorption is very valuble for a fundamental and a practical point of views. Recently, there are some works on this region [1], [2].