Title :
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
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;
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
DOI :
10.1109/IQEC.1998.680124
