Abstract
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 $\lambda_{0}= 4 \ \mu$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 ${\sim} {\hbox {20}}$-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.
© 2010 IEEE
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