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Spatially Resolved Inhomogeneous Depressions Of The Excitons Zeeman Splitting In An Integrated Magnetic-Multiple Quantum Wells System, Ahmed Abdelrahman, Hoon Soo Kang, Sang Youp Yim, Mikhail Vasiliev, Kamal Alameh, Yong Lee
Spatially Resolved Inhomogeneous Depressions Of The Excitons Zeeman Splitting In An Integrated Magnetic-Multiple Quantum Wells System, Ahmed Abdelrahman, Hoon Soo Kang, Sang Youp Yim, Mikhail Vasiliev, Kamal Alameh, Yong Lee
Research outputs 2011
We report on the generation of a nonuniform spatial distribution of the heavy and light-hole excitons in a multiple quantum wells system integrated with a localized inhomogeneous weak magnetic field. An inhomogeneous spatially resolved depression of the Zeeman splittings of the heavy-hole excitons and the light-hole excitons with respect to their translational wave vectors is observed. A localized inverted concentration of the two types of the excitons due to the inhomogeneity of the magnetic field is also measured. A simple method to integrate permanent magnetic materials with the multiple quantum wells system is used to create an accessible degree of …
High-Responsivity Plasmonics-Based Gaas Metal-Semiconductor-Metal Photodetectors, Ayman Karar, Narottam Das, Chee Leongtan, Kamal Alameh, Yong Tak Lee, Fouad Karouta
High-Responsivity Plasmonics-Based Gaas Metal-Semiconductor-Metal Photodetectors, Ayman Karar, Narottam Das, Chee Leongtan, Kamal Alameh, Yong Tak Lee, Fouad Karouta
Research outputs 2011
We report the experimental characterization of high-responsivity plasmonics-based GaAs metal-semiconductor-metal photodetector (MSM-PD) employing metal nano-gratings. Both the geometry and light absorption near the designed wavelength are theoretically and experimentally investigated. The measured photocurrent enhancement is 4-times in comparison with a conventional single-slit MSM-PD. We observe reduction in the responsivity as the bias voltage increases and the input light polarization varies. Our experimental results demonstrate the feasibility of developing a high-responsivity, low bias-voltage high-speed MSM-PD.