Photo-dember effect
WebI notice that inside this article, and also in common usage reflected by a web search for the term, photo-Dember is the most common casing of this term, not photo-dember. I noticed … WebSep 2, 2010 · Terahertz emission from InAs excited by the femtosecond optical pulse is investigated. The hydrodynamic model is developed for the simplified analysis of the terahertz emission induced by the photo-Dember effect. The hydrodynamic model predicts that the amplitude of the transient photocurrent is proportional to the difference between …
Photo-dember effect
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Webther, the photo-Dember effect becomes the dominant mecha-nism. We note that the polarity of the terahertz emission from both n-InMnAs and p-InMnAs at low temperature is the same as the polarity of the terahertz emission from p-InAs. This is consistent with the above description in which the emission mechanism is the same i.e., the photo-Dember ef- WebThe photo-Dember effect is a less commonly exploited THz generation mechanism. It arises from the asymmetric diffusivity of photoexcited electrons and holes, which creates a transient spatial charge distribution and hence dipole radiation. Specifically, in low dimensional nanomaterials, the strong carrier quantum confinement coupled with strong ...
WebNov 15, 2013 · Dember effect: Problems and solutions. In the existing theory of Dember effect research community understands that the photo-electromotive force is the voltage difference arising between the illuminated and dark surfaces of a semiconductor. In this work it is shown that the latter is incorrect. A new formulation of the linear theory of … WebWe have investigated THz radiation characteristics along different directions, either reflective or along lateral by using InAs-based heterostructures. Firstly, we demonstrate the phase shift with In
WebAug 3, 2009 · Ultrashort near-infrared laser pulses may generate terahertz radiation by transient current effects, including surface field and photo-Dember effects, and optical rectification. Distinguishing these effects in GaAs and related materials will be discussed. WebNov 15, 2013 · Dember effect: Problems and solutions. In the existing theory of Dember effect research community understands that the photo-electromotive force is the voltage …
WebJun 10, 2015 · The photo-Dember effect arises from the asymmetric diffusivity of photoexcited electrons and holes, which creates a transient spatial charge distribution and hence the buildup of a voltage. Conventionally, a strong photo-Dember effect is only observed in semiconductors with a large asymmetry between …
WebThe photo-Dember effect arises from the asymmetric diffusivity of photoexcited electrons and holes, which creates a transient spatial charge distribution and hence the buildup of a … cycloplegic mechanism of actionWebMay 20, 2014 · We demonstrate a terahertz multiple emitter design based on the lateral photo-Dember effect and illuminated with a cylindrical … cyclophyllidean tapewormscycloplegic refraction slideshareWebMar 21, 2024 · The influence of the photo–Dember effect is minimal in GaAs when photoexcited at wavelengths close to the bandgap. These facts have been verified very well over the last couple of decades, and there is a consensus regarding this among researchers. However, in GaAs, excitation with high-energy photons results in a shift to photo–Dember … cyclophyllum coprosmoidesWebSep 9, 2015 · The photo-Dember effect is dominant for a narrow band gap semiconductor such as InAs; however, THz emission from the surfaces of semiconductors with wider band gaps such as GaAs and InP originates ... cyclopiteWebIn semiconductor physics, the photo–Dember effect (named after its discoverer Harry Dember) is the formation of a charge dipole in the vicinity of a semiconductor surface … cyclop junctionsWebAug 1, 2007 · Here, E pD is the THz field amplitude due to the photo-Dember effect, a and b are constants depending on the third-order nonlinear susceptibility and other material parameters, and E s is the surface electrical field strength. Most probable cause of this field is the Fermi-level pinning at some energy level in the middle of the band gap of Ge. When … cycloplegic mydriatics