Analysis of AlGaAs/GaAs/InGaAs n-type step multiple quantum wells for the optimization of normal incident absorption
MetadataShow full item record
The response to normal incident radiation in n-type square quantum wells (QWs) is generally expected to be very small because, in the framework of the effective mass model, the parity selection rule of the envelope wavefunctions essentially forbids intersubband transitions induced by transverse electric polarized radiation. This problem can be overcome by employing an asymmetrical QW. In this paper, the effect of asymmetry, and the result of band mixing with the p-like valence and conduction bands due to the truncation of bulk crystal periodicity, of an n-type AlGaAs/GaAs/InGaAs step multiple QW, are analysed using a new 14-band k · p model with envelope function approximation. The structural and material parameters of the device are varied to study the probability density distributions of the ground state and first excited state wavefunctions, and their effect on the response of the device to transverse electric (TE) and transverse magnetic (TM) excitations. From the analysis, it is found that a step multiple QW optimized for absorption of TE mode radiation should have a wide GaAs step and a deep InGaAs well, subjected to the constraints of the material growth and fabrication process of the device. It is also found that, despite the efforts of improving the normal incidence absorption via step well optimization, the TE absorption as predicted using the 14-band k · p model remains less than 1% of the TM absorption.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
Showing items related by title, author, creator and subject.
Karunasiri, Gamani; Alves, Fabio; Swan, William (SPIE, 2017-06-02);Conventional directional sound sensing systems employ an array of spatially separated microphones to achieve directivity. However, there are insects such as the Ormia ochracea fly that can determine the direction of sound ...
Normal incidence silicon doped p-type GaAs/AlGaAs quantum-well infrared photodetector on (111)A substrate Mei, T.; Li, H.; Karunasiri, G.; Fan, W.J.; Zhang, D.H.; Yoon, S.F.; Yuan, K.H. (Elsevier, 2007);p-type quantum-well infrared photodetectors (QWIPs) demonstrate normal incidence response due to band mixing by utilizing valence band transitions that may break the selection rule limiting n-type QWIPs. Due to even more ...
Nunn, R.H. (Monterey, California. Naval Postgraduate School, 1972-04); NPS59NN72041AFollowing a brief comparison of pulse-duration-modulation and proportional systems, a detailed program of analysis and experimentation is described in which thrustors throttled by high velocity transverse jets are evaluated. ...