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Linearly Polarized Remote-Edge Luminescence in GaSe Nanoslabs

Yanhao Tang1, Wei Xie1, Krishna C. Mandal2, John A. McGuire1, and Chih Wei Lai1,*

  • 1Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Electrical Engineering, University of South Carolina, Columbia, South Carolina 29208, USA

  • *cwlai@msu.edu
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Phys. Rev. Applied 4, 034008 – Published 24 September, 2015

DOI: https://doi.org/10.1103/PhysRevApplied.4.034008

Abstract

We report highly linearly polarized remote luminescence that emerges at the cleaved edges of nanoscale gallium selenide slabs tens of micrometers away from the optical excitation spot. The remote-edge luminescence (REL) measured in the reflection geometry has a degree of linear polarization above 0.90, with polarization orientation pointing toward the photoexcitation spot. The REL is dominated by an index-guided optical mode that is linearly polarized along the crystalline c axis. This luminescence is from out-of-plane dipoles that are converted from in-plane dipoles through a spin-flip process at the excitation spot.

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Phys. Rev. Applied 4, 034008– Published 24 September, 2015
  • Received 21 February 2015
Article part of CHORUS

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