Photoreflectance spectra of the i-GaAs (d nm)/n-GaAs structures at room temperature.
Plots of the extrema of the Franz-Keldysh oscillations in the i-GaAs (d nm)/n-GaAs structures as a function of quasi-index ξ. The solid lines indicate the fitted results with a linear function.
Time-domain terahertz waveforms in the i-GaAs(d nm)/n-GaAs structures and GaAs bulk crystal as a reference at room temperature. The signal intensity corresponds to a photocurrent through the dipole antenna.
Fourier power spectra of the terahertz waveforms shown in Fig. 3 .
Normalized intensity of I LO,FP (open circle) and that of (solid circle) of the coherent LO-phonon band in the Fourier power spectrum as a function of built-in electric field strength in the i-GaAs layer. The dashed line for I LO,FP is a guide for the eyes, while the solid curve for is the fitted result using a quadratic function.
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