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Spontaneous emission in non-local materials.

Pavel Ginzburg1,2, Diane J Roth1, Mazhar E Nasir1

  • 1Department of Physics, King's College London, Strand, London WC2R 2LS, UK.

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|September 1, 2018
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Summary

Researchers observed molecular spontaneous emission in a non-local metamaterial. This study reveals how material non-locality impacts light-matter interactions, enhancing decay rates and enabling new quantum electrodynamics applications.

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composite electromagnetic materialsnon-local optical propertiesplasmonic metamaterialsquantum electrodynamicsspontaneous emission

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Area of Science:

  • Quantum electrodynamics
  • Plasmonics
  • Materials science

Background:

  • Light-matter interactions are significantly influenced by the surrounding environment.
  • Metamaterials offer unique ways to control electromagnetic fields.
  • Understanding spontaneous emission in complex nanostructures is crucial for quantum technologies.

Purpose of the Study:

  • To experimentally observe and quantify molecular spontaneous emission within a highly non-local metamaterial.
  • To investigate the influence of material non-locality on emission decay rates.
  • To establish a quantitative description of the Purcell effect in non-local media.

Main Methods:

  • Fabrication of a metamaterial using a plasmonic nanorod assembly.
  • Experimental measurement of molecular spontaneous emission rates.
  • Theoretical modeling of the Purcell effect in non-local metamaterials.

Main Results:

  • First experimental observation of molecular spontaneous emission in a highly non-local metamaterial.
  • Demonstration that both local and non-local responses govern the emission process.
  • Observation of a record-high enhancement of the decay rate, consistent with theoretical predictions.

Conclusions:

  • Material non-locality is a critical factor in modifying light-matter interactions beyond local effective medium approximations.
  • Engineered material non-locality provides new control over quantum electrodynamics phenomena.
  • This work opens avenues for advanced applications in quantum information, photochemistry, imaging, and sensing.