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(a) SEM image of a device. (b) FDTD simulation of the mode profile of the waveguide, calculated with a single - or -polarized dipole placed at the center of the structure and using five photonic crystal periods on each side, with normalized slab height . The dashed green line indicates the location of the photonic band gap edge. The inset shows the calculated wavelengths of the main - and - polarized modes vs the periodicity, , with slab height and a GaAs refractive index of 3.53. (c) FDTD simulation of an equivalent PCWG without mirrors at either end. (d) electric field profile at the center of the slab for the -polarized mode. (e) As (d) except for the -polarized mode.
PL from four separate PCWG structures measured at 45 K, corrected for the polarization of the measuring setup. The sharp lines are due to QD transitions, the broader features are the modes as indicated by the fitted green lines. These examples are chosen as they all have an excitonic transition on or near the relevant mode at 45 K. The insets show the two measurement setups: exciting from the top and collecting from the side (top inset) or from the top (bottom inset). (a) PCWG with measured in-plane. (b) PCWG with measured out-of-plane. (c) PCWG with measured in-plane. (d) PCWG with measured out-of-plane.
(a) In-plane polarization-resolved PL from a PCWG with at 5 K. The sharp lines are from QD transitions. The broad feature highlighted by the green line is the -polarized mode. (b) Time-resolved PL from line 2X at 5 K and when on resonance with the mode at 50 K. (c) Time-resolved PL from line at 5 K and when on resonance with the mode at 40 K. (d) Time-resolved PL from line at 5 K and at 40 K. (e) TRPL from a QD exciton located inside the photonic crystal region.
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