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 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.
3D FDTD modelling is used to study the effect of surface roughening on the vertical emission of a point source emitting at λ 0 = 0.94 µm embedded in GaAs with a mirror behind the dipole. Enhancement of emission is seen at λ 0 = 1.95 µm for a rough-surface device with a perfect metal mirror placed 150 nm below the source.
3D FDTD modelling is employed to design a surface pattern for mid-IR LEDs. Measured enhancement factors over an un-patterned device of 8% and 14% are found at 300K and 25K respectively.
3D FDTD modelling is used to study the effect of surface roughening on the vertical emission of a point source emitting at λ 0 = 0.94 µm embedded in GaAs with a mirror behind the dipole. Enhancement of emission is seen at λ 0 = 1.95 µm for a rough-surface device with a perfect metal mirror placed 150 nm below the source.
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