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Related Experiment Video

Updated: May 26, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Stimulated emission does not radiate in a pure dipole pattern.

Andrew E S Barentine1, W E Moerner1,2

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

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Summary

Stimulated emission (StE) imaging shows that a molecule's emission direction depends on the driving field, not a simple dipole pattern. This finding is crucial for developing advanced microscopy and optical cooling technologies.

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Area of Science:

  • Optics
  • Spectroscopy
  • Microscopy

Background:

  • Stimulated emission (StE) offers advantages in speed, coherence, and resolution over fluorescence imaging.
  • The radiation pattern and directionality of StE from single molecules are not fully understood.
  • Previous StE imaging primarily used transmission detection methods.

Purpose of the Study:

  • To investigate the radiation pattern and directionality of stimulated emission (StE).
  • To clarify the fundamental characteristics of StE for improved microscope design and applications.
  • To determine if StE emission follows a classical dipole pattern or is influenced by the driving field.

Main Methods:

  • Introduced the StE driving field (probe) at an angle.
  • Utilized total internal reflection to eliminate incident probe light and reflections in detection.
  • Employed a non-collinear detection configuration to simultaneously collect StE and fluorescence.
  • Observed fluorescence depletion in the spectral window expected for StE emission.

Main Results:

  • Fluorescence depletion was observed in the spectral window where StE signal was expected.
  • The results indicate that StE emission does not follow a simple classical dipole pattern.
  • Simultaneous fluorescence measurement calibrated the potential size of StE emission.

Conclusions:

  • Stimulated emission directionality is dependent on the driving field, not a pure dipole radiation.
  • This clarification is vital for optimizing microscope design and optical cooling.
  • Understanding StE characteristics enables advancements in applications using small emitter arrays.