Spontaneous Emission in Quantum State

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Presentation transcript:

Spontaneous Emission in Quantum State Jongmin Lee

Photon Emission Process Stimulated emission Spontaneous emission

Spontaneous Emission Rate Dominant recombination paths of carriers in direct bandgap semiconductor --> LED Most common source of photon provided by nature

Spontaneous Emission Vacuum field strength Vacuum field induced transitions can occur with no classical field stimulation, we refer to them as spontaneous emission event. For the understanding What is vacuum field How we can get a spontaneous emission rate with vacuum field

Quantum Theory for Photon Old quantum theory First quantized – atomic levels are quantized Electromagnetic wave is not Extended to second quantized theory Quantum electrodynamics (QED) Relativistic quantum field theory of electrodynamics

Dirac Sea Theoretical model for vacuum

Vacuum State Quantum state with lowest possible energy No means a simple empty space Short-lived virtual particle-antiparticle pairs

SE in micro cavity Purcell effect Vacuum field renormalization factor

SE Rate in Micro Cavity

Thank you!