Abstract
Moving space charge field (photo-emf) effects are observed in standard and low temperature grown GaAs multiple quantum well (MQW) samples in which dc photocurrents are generated by constant speed moving optical interference patterns. Experiments reveal an enhanced detection bandwidth for optical doppler frequency measurements compared to previously studied bulk II-VI and III-V materials due to the higher quantum efficiency and optical absorption of GaAs MQWs, in spite of their reduced carrier mobility-lifetime product values resulting mainly from the significantly shorter free carrier lifetimes. The high defect density of low temperature grown MQWs can also yield large field-of-view and, for optical ultrasound detections, high cutoff frequency.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
