The spontaneous emission from luminescent Si photonic layer-by-layer crystals is studied. Luminescence from both implanted Er ions and the polycrystalline Si host is observed in the 1.1–1.7 μm wavelength range and serves as a probe of the photonic band structure. The spontaneous emission is strongly suppressed for wavelengths between 1.4 and 1.7 μm. The spectral changes are described by a model that takes into account changes in the local density of states, internal Bragg scattering in the crystal, and the internal quantum efficiency of the optical transition involved. A spectral attenuation of ∼5dB per unit cell is derived from the spontaneous emission data, consistent with theory and transmission data.

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Journal Phys. Rev. B
de Dood, M.J.A, & Polman, A. (2003). Modified spontaneous emission from erbium doped photonic woodpile crystals. Phys. Rev. B, 67(Article number: 115106), 1–5. doi:10.1103/PhysRevB.67.115106