Optical study of THz plasmon-phonon oscillations in semiconductors

Gyu Cheon Cho

doi:10.1117/12.306170

23 April 1998 Optical study of THz plasmon-phonon oscillations in semiconductors

Gyu Cheon Cho

Proceedings Volume 3277, Ultrafast Phenomena in Semiconductors II; (1998) https://doi.org/10.1117/12.306170
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

The dynamics of coherent plasmon-phonon oscillations in compound semiconductors are investigated using a pump-probe technique. It is shown that the optically excited coherent carriers drive the thermal carriers introduced by the doping in forming coherent plasma oscillations. By analyzing the coupled oscillations with different hole densities a strong influence of electron-hole scattering on the dephasing of coherent plasmons is found. For the near-band edge detection the reflectivity change by these oscillations is strongly enhanced by the Franz-Keldysh effect. Finally, the second harmonic of the coherent longitudinal optical phonon frequency is observed as a result of the dynamical Franz-Keldysh effect.

Citation Download Citation

Gyu Cheon Cho "Optical study of THz plasmon-phonon oscillations in semiconductors", Proc. SPIE 3277, Ultrafast Phenomena in Semiconductors II, (23 April 1998); https://doi.org/10.1117/12.306170

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