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(a) Cross-sectional view of a 2D DFB polymer laser; the angles (polar angle to the axis) and (azimuthal angle in the plane) correspond to the direction of emission and the symmetries of the Brillouin zone (the for and the for ) respectively; (b) the real space lattice of the square diffraction grating. The mirror planes (10) and (11) are illustrated, along with the grating vectors for the two symmetries of the Brillouin zone.
Output spectra of the polymer laser above and below threshold. Inset shows a contour plot of the emission’s wavelength vs the angle measured in the plane .
Laser output as a function of pump energy for the two longitudinal modes
Experimental and calculated values of the angle dependent photoluminescence measurements.
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