Deep-subwavelength imaging of the modal dispersion of light.

  title={Deep-subwavelength imaging of the modal dispersion of light.},
  author={Riccardo Sapienza and Toon Coenen and Jan Renger and Martin Kuttge and Niek F. van Hulst and Albert Polman},
  journal={Nature materials},
  volume={11 9},
Numerous optical technologies and quantum optical devices rely on the controlled coupling of a local emitter to its photonic environment, which is governed by the local density of optical states (LDOS). Although precise knowledge of the LDOS is crucial, classical optical techniques fail to measure it in all of its frequency and spatial components. Here, we use a scanning electron beam as a point source to probe the LDOS. Through angular and spectral detection of the electron-induced light… 
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