Title :
Femtosecond buildup of phonon-plasmon mixed modes in polar semiconductors investigated via single-cycle multi-THz spectroscopy
Author :
Huber, R. ; Kübler, C. ; Leitenstorfer, A.
Author_Institution :
Phys. Dept., Technische Univ. Munchen, Garching, Germany
fDate :
27 Sept.-1 Oct. 2004
Abstract :
The ultrafast transition of an optical phonon resonance to a coupled phonon-plasmon system is studied with uncertainty-limited temporal resolution. After intense interband photoexcitation of high-purity InP with 10 fs laser pulses, the buildup of coherent beats of the emerging hybrid modes of the lattice and the plasma is directly monitored by means of ultrabroadband THz spectroscopy. Mutual repulsion and redistribution of the oscillator strength of the interacting phonons and plasmons are seen to emerge within approximately one oscillation cycle of the upper branch of the mixed modes.
Keywords :
III-V semiconductors; dielectric function; high-speed optical techniques; indium compounds; oscillator strengths; phonon-plasmon interactions; photoexcitation; polar semiconductors; submillimetre wave spectra; 10 fs; InP; dielectric function; femtosecond laser pulses; interband photoexcitation; optical phonon resonance; oscillator strength; phonon-plasmon mixed modes; polar semiconductors; single cycle multiple THz spectroscopy; ultrabroadband THz spectroscopy; ultrafast transition; uncertainty-limited temporal resolution; Indium phosphide; Laser modes; Laser transitions; Optical coupling; Optical pulses; Phonons; Resonance; Semiconductor lasers; Spectroscopy; Ultrafast optics;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1422204
