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We have measured the in-plane optical anisotropy(IPOA) of(1120) ZnO(a-plane) on(1012) sapphire(r-plane) by reflectance difference spectroscopy(RDS) at room temperature.Giant IPOA has been observed between the light polarized direction parallel and perpendicular to the c axis of ZnO,since the symmetry of a-plane is C2v.A sharp resonance has been observed near the fundamental band gap,which is induced by the polarizationdepend band gap shift.The sharp line shape is attributed to the exciton transition.The spectra fitting and differential spectra indicate the polarization-depend band energies.The giant IPOA is possible enhanced by anisotropy strain along and perpendicular to the c axis in the a-plane.
We have measured the in-plane optical anisotropy (IPOA) of (1120) ZnO (a-plane) on (1012) sapphire (r-plane) by reflectance difference spectroscopy light polarized direction parallel and perpendicular to the c axis of ZnO, since the symmetry of a-plane is C2v. A sharp resonance has been observed near the fundamental band gap, which is induced by the polarization dependency band gap shift. sharp line shape is is attributed to the exciton transition. spectra fitting and differential spectra indicate the polarization-depend band energies. giant IPOA is possible enhanced by anisotropy strain along and perpendicular to the c axis in the a-plane.