In-plane polarization anisotropy and polarization rotation for M-plane GaN films on LiAlO[sub 2]

Misra, Pranob; Yue Jun Sun; Brandt, Oliver; Grahn, Holger T.
November 2003
Applied Physics Letters;11/24/2003, Vol. 83 Issue 21, p4327
Academic Journal
We investigate the dependence of the transmittance spectra of strained M-plane GaN films on the angle of the linear in-plane polarization, with the c axis of the underlying wurtzite crystal structure in the film plane. Because of the reduced in-plane symmetry and the large in-plane anisotropic strain, the transmission spectra for an arbitrary in-plane polarization angle can be directly derived from two transitions with polarizations parallel and perpendicular to the c axis. Since the energy gap for these two polarizations is shifted by more than 50 meV, the M-plane GaN film becomes dichroic, resulting in a polarization rotation after transmission for energies between the two gaps for an initial angle of 45° by as much as 40° towards the c axis. © 2003 American Institute of Physics.


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