Terahertz gain on intersubband transitions in multilayer delta-doped p - Ge structures
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Intervalence-band THz laser in selectively-doped semiconductor structure
Monte Carlo simulation of carrier dynamics and far-infrared absorption in a selectively-doped p-type multilayer Ge structure with vertical transport was performed to test a novel terahertz laser concept. The design exploits the known mechanism of THz amplification on intersubband transitions in p-Ge, but with spatial separation of light hole accumulation regions from doped regions, which allows...
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A solid state broad band amplifier of terahertz radiation ~1.5–4 THz!, based on intersubband transitions of hot holes in p-Ge is demonstrated. The gain is investigated as a function of applied magnetic and electric fields by transmission measurements using a laser system with two p-Ge active crystals, when one operates as an oscillator and one as an amplifier. A peak gain higher than usually re...
متن کاملSelectively doped germanium THz laser
Monte Carlo simulation of carrier dynamics and far-infrared absorption was performed to test the importance of electron-electron interaction in selectively doped multi-layer p-Ge laser at high doping concentration. The laser design exploits the known widely tunable mechanism of THz amplification on inter-sub-band transitions in p-Ge, but with spatial separation of carrier accumulation and relax...
متن کاملPopulation-inversion and gain estimates for a semiconductor TASER
We have investigated a solid–state design advanced (Soref et al. SPIE Proceedings, vol. 3795, 516 (1999)) to achieve Terahertz-Amplification-by-the-Stimulated-Emission-of-Radiation (TASER). The original design was based on lightto heavy-hole intersubband transitions in SiGe/Si heterostructures. This work adapts the design to electron intersubband transitions in the more readily available GaAs/G...
متن کاملIntersubband terahertz transitions in Landau level system of cascade GaAs/AlGaAs quantum well structures in strong tilted magnetic field
The tunable terahertz intersubband Landau level transitions in resonant tunneling cascade quantum well structures are considered. The way of lifting the selection rule forbidding the inter-Landau level terahertz transitions of interest by applying a magnetic field tilted with respect to the structure layers is proposed. The importance of asymmetric structure design to achieve considerable value...
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تاریخ انتشار 2014