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The emission from a radiating source embedded in a photonic lattice iscalculated. The analysis considers the photonic lattice and free space as acombined system. Furthermore, the radiating source and electromagnetic fieldare quantized. Results show the deviation of the photonic lattice spectrum fromthe blackbody distribution, with intracavity emission suppressed at certainfrequencies and enhanced at others. In the presence of rapid populationrelaxation, where the photonic lattice and blackbody populations are describedby the same equilibrium distribution, it is found that the enhancement does notresult in output intensity exceeding that of the blackbody at the samefrequency. However, for slow population relaxation, the photonic latticepopulation has a greater tendency to deviate from thermal equilibrium,resulting in output intensities exceeding those of the blackbody, even foridentically pumped structures.Comment: 19 pages, 11 figure

Theory of emission from an active photonic lattice