Terahertz emission spectroscopy of coherent phonons excited in n-PbTe

Author

Tani, Motoaki ; Abe, H. ; Fukasawa, Ryoichi ; Sakai, Kenji ; Nakashima, S. ; Yoshioka, Nobukazu ; Ishida, A. ; Fujiyasu, H.

Author_Institution

Commun. Res. Lab., Minist. of Posts & Telecommun., Kobe, Japan

fYear

1998

fDate

8-8 May 1998

Firstpage

59

Abstract

Summary form only given. We report the THz emission spectroscopy for the coherent phonons excited in n-PbTe with high carrier concentration. PbTe has a NaCl-like crystal structure and only IR-active phonon modes, namely, the transverse optical (TO) mode at 0.95 THz and the longitudinal optical (LO) mode at 3.4 THz. We observed substantial increase of spectral amplitude at the LO phonon frequency with the increase of the carrier concentration, while the frequency of the spectral peak remained unchanged.

Keywords

II-VI semiconductors; carrier density; excited states; high-speed optical techniques; lead compounds; phonons; submillimetre wave spectra; 3.4 THz; IR-active phonon modes; LO mode; LO phonon frequency; NaCl-like crystal structure; PbTe; THz emission spectroscopy; TO mode; carrier concentration; coherent phonon excitation; high carrier concentration; n-PbTe; spectral amplitude; spectral peak frequency; terahertz emission spectroscopy; Detectors; Face detection; Frequency; Laser excitation; Laser mode locking; Optical surface waves; Phonons; Photoconductivity; Spectroscopy; Submillimeter wave measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Quantum Electronics Conference, 1998. IQEC 98. Technical Digest. Summaries of papers presented at the International

Conference_Location

San Francisco, CA, USA

Print_ISBN

1-55752-541-2

Type

conf

DOI

10.1109/IQEC.1998.680124

Filename

680124