Effect of strain and barrier composition on the polarization of light emission from AlGaN/AlN quantum wells
For AlGaN-based multi-quantum-well light emitters grown on c-plane substrates there is a tendency for the polarization of the emitted light to switch from transverse electric (TE) polarization to transverse magnetic (TM) polarization as the wavelength decreases. This transition depends on various factors that include the strain in the quantum well. Experimental results are presented that illustrate the phenomenon for nitride LEDs grown on sapphire and on bulk AlN. Model calculations are presented which quantify the dependence of the TE/TM switch on the quantum well strain and the Al composition in the barriers surrounding the well.
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Northrup, J. E.; Chua, C. L.; Yang, Z.; Wunderer, T.; Kneissl, M. A.; Johnson, N. M.; Kolbe T. Effect of strain and barrier composition on the polarization of light emission from AlGaN/AlN quantum wells. Applied Physics Letters. 2012 January 9; 100 (2): 021101.
Copyright © American Institute of Physics, 2012. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at http://link.aip.org/link/doi/10.1063/1.3675451 .