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Finite-Difference Time-Domain Modeling of Periodic and Disordered Surface Gratings in AlInSb Light Emitting Diodes With Metallic Back-Reflectors

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4 Author(s)
Buss, I.J. ; Dept. of Electr. & Electron. Eng., Univ. of Bristol, Bristol, UK ; Nash, G.R. ; Rarity, J.G. ; Cryan, M.J.

Two-dimensional finite-difference time-domain modeling is undertaken to study the optical behaviour of midinfrared AlInSb light-emitting diode devices with close metallic back reflectors. The location of the source and mirror is investigated in detail and optimised for peak emission at ??0 = 4 ??m. A periodic surface grating is added and it is found that greater than 98% of the light at a specific wavelength may be extracted for specific grating parameters, an enhancement of ~ 20-fold. A novel type of grating termed disordered-periodic is then studied and is shown to have a much broader spectral response with more than 50% of the power extracted across a broad wavelength range.

Published in:

Lightwave Technology, Journal of  (Volume:28 ,  Issue: 8 )

Date of Publication:

April15, 2010

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