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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Nanophotonics

Background:

  • Thermal radiation typically follows Planck's law, assuming a smooth electromagnetic mode structure.
  • This universality is based on emission into free space, historically linked to 3D cavities.
  • Graphene nanojunctions are known to emit thermal radiation obeying Planck's law.

Purpose of the Study:

  • To investigate thermal radiation in a structured electromagnetic environment.
  • To probe the effect of patterned optical modes on Planck's law.
  • To utilize graphene nanojunctions as sensitive thermal light emitters.

Main Methods:

  • Using current-driven graphene nanojunctions as point-like thermal light sources.
  • Placing emitters near a mirror to create a patterned electromagnetic mode structure.
  • Varying the distance between the emitter and mirror with atomic precision.
  • Analyzing the resulting thermal emission spectrum.

Main Results:

  • Observed a significant imprint of the node/antinode pattern of light modes on the emission spectrum.
  • Demonstrated high sensitivity of thermal emission to the electromagnetic environment.
  • Showcased the ability to sample the mode structure with atomic precision.

Conclusions:

  • Thermal radiation is highly sensitive to spatially and spectrally patterned electromagnetic environments.
  • The universality of Planck's law for thermal emission can be modulated by structured optical modes.
  • This work provides new insights into thermal radiation physics in complex photonic settings.