Excitation-density-dependent generation of broadband terahertz radiation in an asymmetrically excited photoconductive antenna |
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| Authors: | Upadhya Prashanth C Fan Wenhui Burnett Andrew Cunningham John Davies A Giles Linfield Edmund H Lloyd-Hughes James Castro-Camus Enrique Johnston Michael B Beere Harvey |
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| Affiliation: | School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK. p.upadhya@leeds.ac.uk |
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| Abstract: | The generation of terahertz (THz) transients in photoconductive emitters has been studied by varying the spatial extent and density of the optically excited photocarriers in asymmetrically excited, biased low-temperature-grown GaAs antenna structures. We find a pronounced dependence of the THz pulse intensity and broadband (>6.0 THz) spectral distribution on the pump excitation density and simulate this with a three-dimensional carrier dynamics model. We attribute the observed variation in THz emission to changes in the strength of the screening field. |
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