Abstract

Recently there has been tremendous interest in exciton-polariton mode splitting^[1] and thresholdless coherent emission^[2] in semiconductor microcavities. Previous researchers have observed such splitting through modified cavity resonance in the frequency domain^[1] and indirectly in the time domain^[3]. We present data, showing direct observation of such exciton-polariton oscillating emission in the time domain for the first time to the best of our knowledge. A simultaneous observation was made in the frequency domain and is in agreement with the expected value. This experimental result supports the view that the previously observed thresholdless coherent emission^[2] is not resonant Rayleigh scattering but rather exciton-polariton emission.

© 1994 Optical Society of America