Abstract
Photonic crystals (PhCs) were typically fabricated on the mesa surface
of an LED to improve light extraction, which is regarded as the weak coupling
between the laterally propagated light in the epilayers and the surface nanostructure.
Here, we report GaN-based LEDs with the PhC structure on the mesa surface
and nanohole reflectors surrounding the light-emitting mesa. The output power
of the new LED structure is higher than that of the device with only surface
PhCs due to the enhanced diffraction of low-order modes propagated in the
lateral direction, in addition to the higher order mode light diffraction
from the surface PhCs. From the relative angular spectra, the interaction
of in-plane optical wave with the nanoholes (which are etched through multiple
quantum wells) is much stronger than that with surface PhCs, suggesting an
efficient light diffraction to the surface normal by nanoholes.
© 2011 IEEE
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