High energy terahertz pulse emission from GaAs illuminated by a femtosecond laser

J. H. Sun; J. G. Gallacher; N. Limos; R. Issac; J. M. Dias; Z. X. Huang; D. A. Jaroszynski

doi:10.1117/12.755486

4 January 2008 High energy terahertz pulse emission from GaAs illuminated by a femtosecond laser

J. H. Sun, J. G. Gallacher, N. Limos, R. Issac, J. M. Dias, Z. X. Huang, D. A. Jaroszynski

Proceedings Volume 6840, Terahertz Photonics; 68401B (2008) https://doi.org/10.1117/12.755486
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

High energy terahertz pulses are produced by illuminating a biased GaAs wafer using a short pulse from a Ti:sapphire laser with a central wavelength of 800 nm, a pulse width of 50fs (FWHM) and a repetition rate of 10 Hz. We show that the peak THz amplitude scales with the bias voltage and thus the THz energy and intensity scales quadratically with bias voltage for bias fields up to 3 kV/cm. For laser pulses with an energy density of 1 mJ/cm² we observe a multiple pulse structure. We show that the polarity of the terahertz pulses is consistent with multiple reflections from the exit face of the GaAs slab and the boundary of a plasma slab inside the wafer produced by the laser. We use the standard Drude model for terahertz production from the GaAs wafer to describe multiple pulse structure due to reflections from the plasma boundary layer in the slab. The time delays between multiple pulses are consistent with a 120 μm thick slab produced by photo-produced carriers.

Citation Download Citation

J. H. Sun, J. G. Gallacher, N. Limos, R. Issac, J. M. Dias, Z. X. Huang, and D. A. Jaroszynski "High energy terahertz pulse emission from GaAs illuminated by a femtosecond laser", Proc. SPIE 6840, Terahertz Photonics, 68401B (4 January 2008); https://doi.org/10.1117/12.755486

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