Terahertz emission spectroscopy of coherent phonons in semiconductors

Masahiko Tani; Ryoichi Fukasawa; Michael Herrmann; Kiyomi Sakai; Shin-ichi Nakashima; Nobuya Yoshioka; Akihiro Ishida; Hiroshi Fujiyasu

doi:10.1117/12.349285

24 May 1999 Terahertz emission spectroscopy of coherent phonons in semiconductors

Masahiko Tani, Ryoichi Fukasawa, Michael Herrmann, Kiyomi Sakai, Shin-ichi Nakashima, Nobuya Yoshioka, Akihiro Ishida, Hiroshi Fujiyasu

Author Affiliations +

Proceedings Volume 3624, Ultrafast Phenomena in Semiconductors III; (1999) https://doi.org/10.1117/12.349285
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

We investigate infrared-active coherent phonons excited in Te, PbTe (un-doped, n-type and p-type), and CdTe by observing the terahertz (THz) emission from these samples. Coherent THz emission corresponding to the longitudinal- optical (LO)-phonon frequency has been observed for all the samples, while no significant THz emission is observed at the transverse-optical (TO)-phonon frequency even at high carrier densities (> 10¹⁸ cm^-3). The absence of THz emission at the TO-phonon frequency strongly contradicts the observation in the transient reflectivity measurements, where the signal oscillations at the TO-phonon frequencies arising from the LO-phonon-plasmon coupling (L_ mode) have been observed at high carrier densities. It is found from a model calculation that for a dipole oscillator on a sample surface the THz emission around the TO-phonon frequency is strongly suppressed due to the large dielectric constant near this frequency.

Citation Download Citation

Masahiko Tani, Ryoichi Fukasawa, Michael Herrmann, Kiyomi Sakai, Shin-ichi Nakashima, Nobuya Yoshioka, Akihiro Ishida, and Hiroshi Fujiyasu "Terahertz emission spectroscopy of coherent phonons in semiconductors", Proc. SPIE 3624, Ultrafast Phenomena in Semiconductors III, (24 May 1999); https://doi.org/10.1117/12.349285

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