Midinfrared pump-probe reflection spectroscopy of the coupled phonon-plasmon mode in GaN

Masaya Nagai, Kazuhiro Ohkawa, Makoto Kuwata-Gonokami

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Strong photoinduced reflectivity change in the midinfrared region in GaN is observed by femtosecond pump-probe measurements. By comparing the results of simultaneous emission and reflectivity measurements, we show that midinfrared reflectivity spectra are governed by coupled phonon-plasmon modes and spatial inhomogeneity of carrier density. Even when the plasma frequency lies in the far infrared region at low carrier density of 1018cm−3, the strong plasmon-phonon coupling drives the position of upper phonon-plasmon mode to midinfrared region, allowing us to investigate dynamics of photogenerated free carriers in GaN-based materials by midinfrared reflectivity measurements.

Original languageEnglish (US)
Pages (from-to)484-486
Number of pages3
JournalApplied Physics Letters
Volume81
Issue number3
DOIs
StatePublished - Jul 15 2002
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Midinfrared pump-probe reflection spectroscopy of the coupled phonon-plasmon mode in GaN'. Together they form a unique fingerprint.

Cite this