Effects of magnetic field and optical fluence on terahertz emission in gallium arsenide

The excitation density dependence of magnetic-field-enhanced terahertz (THz = 1012 Hz) emission from (100) GaAs is studied. It is found that THz power saturates at a higher optical-excitation density, when a magnetic field is applied. This observation explains the different magnetic field enhancemen...

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Bibliographic Details
Main Authors: Corchia, A, McLaughlin, R, Johnston, M, Whittaker, D, Arnone, D, Linfield, E, Davies, A, Pepper, M
Format: Journal article
Language:English
Published: 2001
Description
Summary:The excitation density dependence of magnetic-field-enhanced terahertz (THz = 1012 Hz) emission from (100) GaAs is studied. It is found that THz power saturates at a higher optical-excitation density, when a magnetic field is applied. This observation explains the different magnetic field enhancements that have been reported recently. At low excitation densities the results are shown to be consistent with a simple model of carrier-carrier scattering, whilst at higher densities surface field screening becomes important.