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(a) Schematic representation of the two-dimensional PhC excited by the pump radiation. is the period of the photonic lattice, and are the incident and azimuthal angles respectively; , , and denote the wave vectors of the pump radiation, SH, and TH reflected signals, respectively. (b) Calculated (full lines) and experimental (dots) equifrequency surfaces of the resonant Bloch modes for a -polarized pump radiation at . The modes are labeled according to the number of the corresponding photonic band and the polarization of the matching incident wave along . The dashed circle corresponds to the incident in-plane wave vector for . The intersections along the direction between the dashed circle and the equifrequency surface labeled indicate the geometrical configuration allowing the coupling of the incident radiation into the resonant Bloch mode.
SH (a) and TH (b) reflected signals measured versus , at (, for the GaN PhC (●) and for the unpatterned GaN layer (엯). The -polarized fundamental radiation is resonant with mode along . Insets in both figures illustrate the power dependence of the signals for .
Emission spectrum at room temperature, for and . A combination of filters in front of the detector rejects TH as well as pump radiation.
NBE (full circles) and yellow (open circles) PL intensities as a function of the azimuthal angle . The -polarized pump radiation at is incident at . Inset: NBE (full circles) and yellow (open circles) PL peak intensities vs the pump beam power. The lines show the cubic dependence.
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