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

fYear

2004

fDate

27 Sept.-1 Oct. 2004

Firstpage

543

Lastpage

544

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ICIMW.2004.1422204

Filename

1422204