The role of optical rectification in the generation of terahertz radiation from GaBiAs

Radhanpura, K.; Hargreaves, S.; Lewis, R. A.; Henini, M.
June 2009
Applied Physics Letters;6/22/2009, Vol. 94 Issue 25, p251115
Academic Journal
We report on a detailed study of the emission of terahertz-frequency electromagnetic radiation from layers of GaBiyAs1-y (0≤y<0.04) grown by molecular beam epitaxy on (311)B and (001) GaAs substrates. We measure two orthogonally polarized components of the terahertz radiation emitted under excitation by ultrashort near-infrared laser pulses in both transmission and reflection geometries as a function of the crystal rotation about its surface normal as well as the effect of in-plane magnetic field and pump fluence on the terahertz emission. We conclude that the principal mechanism for terahertz generation is via optical rectification rather than transient currents.


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