Abstract
Detailed analysis of experimentally observed far-field diffraction patterns
from LEDs containing a buried photonic quasi-crystals (PQC) slab are presented
for devices with PQC layer depths of 300 to 1300 nm and pitch 400 nm. Ewald
constructions allowed identification of the features in experimental data
to be correlated with identified waveguide modes from which light is extracted.
Effective indices for the slab waveguide modes calculated by a modal expansion
method are found to be in close agreement with values extracted from the experimental
results, allowing validation of both an effective medium model for the PQC
slabs and a design and analysis method for LED structures with diffractive
buried photonic crystals.
© 2013 IEEE
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