The electrostatic coupling of longitudinal optical phonon and plasmon in wurtzite InN thin films

Chang, Y.-M.; Liou, S. C.; Chen, C. H.; Lee, H.-M.; Gwo, S.
January 2010
Applied Physics Letters;1/25/2010, Vol. 96 Issue 4, p041908
Academic Journal
We utilize coherent longitudinal optical phonon as an optical nanoprobe to investigate the plasmonic behavior of wurtzite c-plane InN thin films. The transition from the three-dimensional electron gas in InN bulk toward the two-dimensional electron gas in InN thin film is revealed via measuring the coupling strength of coherent A1(LO) phonon and plasmon coupling mode. The coupling strength diminishes as the film thickness reduces and finally vanishes at 3±1 nm. This phenomenon is ascribed to the detuning of the intersubband plasmon frequency above the A1(LO) frequency, which is originated from the electronic quantum confinement in InN thin films.


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