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Enhanced Spontaneous Emission of Bloch Oscillation Radiation from a Single Energy Band
Final progress rept., 1 Oct 2005-30 Jun 2006
NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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In this study, we explored the possibility of enhanced spontaneous emission of radiation beyond the free space value by analyzing a superlattice structure placed in a microcavity whose resonant modes were tuned to the Bloch frequency. In particular, we considered the spontaneous emission of Bloch radiation into the rectangular waveguide dominant mode. In the analysis, the quantum radiation field was described by the waveguide quantized electromagnetic field in the Coulomb gauge, and the instantaneous eigenstates of the Bloch Hamiltonian were used as basis states to analyze the Bloch dynamics to all orders in the constant external electric field. The results predict that the spontaneous emission occurs with frequencies equal to integral mutltiples of the Bloch frequency without any ad hoc assumptions made concerning the existence of Wannier-Stark ladder levels such quantization effects arise from a natural consequence of the implicit quantum selection rules.
APPROVED FOR PUBLIC RELEASE