Dynamic polarization filtering in anisotropically strained M -plane GaN films

K. Omae, T. Flissikowski, P. Misra, O. Brandt, H. T. Grahn, K. Kojima, Y. Kawakami

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15 Citations (Scopus)

Abstract

The dynamic optical polarization filtering for anisotropically strained M -plane GaN films on LiAl O2 is investigated by pump and probe spectroscopy. Due to a very large polarization anisotropy in the absorption coefficient, these films exhibit an intrinsic polarization filtering, which appears as a rotation of the polarization vector after transmission of linearly polarized light through the film. For dynamic filtering, the polarization rotation is controlled by the pump, since the photoexcited carriers remove the intrinsic linear dichroism by selective bleaching of the anisotropic absorption. The dynamic behavior of the polarization rotation is mainly determined by the redistribution of holes between the two uppermost valence bands and by the recombination time. The latter is comparable to the measured decay time of the dynamic rotation of about 15 ps. For M -plane GaN films, the maximum dynamic rotation reaches 35°, while the maximum static polarization rotation is about 40°.

Original languageEnglish
Article number191909
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number19
DOIs
Publication statusPublished - 2005 May 9
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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