Albert Einstein was the first to realize that stimulated emission and spontaneous emission goes hand in hand. In his famous 1917 paper 1, he showed that his A and B coefficients are intimately coupled.

Spontaneous Emission Control in Semiconductor Microcavities

For an efficient single-photon source a high-count rate into a well-defined spectral and spatial mode is desirable. Here we have developed a hybrid planar Fabry-Perot microcavity by using a two-photon polymerization process (2PP) where coupling between single-photon sources (diamond colour centres) and resonance modes is observed. The first step consists of using the 2PP process to build a polymer table structure around previously characterized nitrogen-vacancy (NV) centres on top of a distributed Bragg reflector (DBR) with a high reflectivity at the NV zero-phonon line (ZPL). Afterwards, the polymer structure is covered with a silver layer to create a weak (low Q) cavity where resonance fluorescence measurements from the NVs are shown to be in good agreement with analytical and Finite Difference Time Domain (FDTD) results.

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Fabrication of hybrid Fabry-Pérot microcavity using two-photon lithography for single-photon sources

Spectral characteristics of emission from Fabry-Perot cavities containing dipoles with fixed positions are calculated. It is shown that the emission characteristics can have a sensitive dependence on the precise location of the dipoles. When the dipoles have a fixed position the usual analysis of the emission in terms of the cavity transmission characteristics becomes invalid. Interference effects which lead to the spectral characteristics are then determined by the details of the interaction between the cavity reflectors and the spontaneous wavepackets emitted from the excited dipoles. Typical measured emission which resembles cavity transmission spectra actually results from averaging over many dipole positions. For dipole locations close to a cavity reflector, that is within the first-order coherence length of the spontaneous emission, total emission into all cavity modes can be either increased or decreased depending on the precise dipole location. An example of the dipole localization effects is given in the experimental emission characteristics from a semiconductor Fabry-Perot cavity. >

Z. Huang

Papers

Emission characteristics from dipoles with fixed positions in Fabry-Perot cavities