Abstract
Coherent oscillations of phonons are excited by irradiation of a femtosecond laser pulse which duration is much shorter than those vibrational periods. Transient reflectivity shows modulation due to these coherent oscillations and gives dynamic information of phonons, known as time-domain spectroscopy (TDS). Furthermore, using a pair of femtoseconds laser pulses for excitation, amplitude of the coherent oscillations can be controlled by changing separation time between the pulses (coherent control technique) [1,2]. In polar semiconductors, coherent oscillations of phonon-plasmon coupled mode are also excited when the plasma frequency and .the phonon frequency are similar. Dynamics of longitudinal optical (LO) phonons and LO-phonon-plasmon coupled (LOPC) oscillations have been studied using TDS [3]. However, the intensity of LOPC is too small and hidden under the LO-phonon oscillations. Then dynamical information of LOPC has not been obtained. In this paper, we detected the LOPC coherent oscillations in InP by suppressing the strong LO-phonon oscillations using the coherent control technique.
© 2013 IEEE
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