Light Emission of Single Emitters in 3-dimensional Photonic Crystals

光子晶体的独特性质之一是它们对嵌入式发射器的光致发光的影响。光子晶体可以通过改变电磁场的真空涨落来增强或抑制自发辐射。由于光子晶体内部的各向异性光传播，它们可以在空间和光谱上重新分布发射的光子。然而，所有这些性质都取决于光子晶体内部发射器的局部位置以及其发射波长。对发射体系综的测量混合了所有这些局部效应，在大的光谱区域上平均，因此使光子晶体的详细研究变得复杂。该项目的新颖实验方法是去除系综平均，并在一个特定位置和一个窄的频率范围内探测光子晶体中的单量子点局域态密度。为此，我们将利用散焦宽场荧光显微术研究单点发射光子晶体中的各向异性光传输。这将允许第一次的空间和频率选择性的研究在光子晶体中的局域态密度的变化，并且是进一步的直接步骤，以控制与三维光子晶体的帮助下的单光子源的发射。

One of the distinct properties of photonic crystals is their influence on the photoluminescence of embedded emitters. Photonic crystals can enhance or inhibit spontaneous emission due to a modification of the vacuum fluctuations of the electromagnetic field. They can redistribute emitted photons spatially and spectrally due to an anisotropic light propagation inside the photonic crystal. However, all of these properties depend on the local position of the emitter inside the photonic crystal and further its emission wavelength. Measurements on ensembles of emitters mix all these local effects, average over large spectral regions and therefore make a detailed investigation of the photonic crystal complicated. The novel experimental approach of this project is to remove the ensemble average and to probe the local density of states in a photonic crystal with single quantum dots just at one specific site and in a narrow frequency region. For this purpose defocused wide-field fluorescence microscopy will be employed to study the anisotropic light propagation in photonic crystals be means of single point like emitters. This will allow for the first time a spatially and frequency selective study of the variation of the local density of states in a photonic crystal and is further a direct step to control the emission of single photon sources with the help of 3-dimensional photonic crystals.