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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 18 — Sep. 3, 2007
  • pp: 11472–11480

Emission spectrum of electromagnetic energy stored in a dynamically perturbed optical microcavity

Murray W. McCutcheon, Andras G. Pattantyus-Abraham, Georg W. Rieger, and Jeff F. Young  »View Author Affiliations

Optics Express, Vol. 15, Issue 18, pp. 11472-11480 (2007)

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An ultrafast pump-probe experiment is performed on wavelength-scale, silicon-based, optical microcavities that confine light in three dimensions with resonant wavelengths near 1.5 µm, and lifetimes on the order of 20 ps. A below-bandgap probe pulse tuned to overlap the cavity resonant frequency is used to inject electromagnetic energy into the cavity, and an above-bandgap pump pulse is used to generate free carriers in the silicon, thus altering the real and imaginary components of the cavity’s refractive index, and hence its resonant frequency and lifetime. When the pump pulse injects a carrier density of ~5×1017 cm-3before the resonant probe pulse strikes the sample, the emitted radiation from the cavity is blue-shifted by 16 times the bare cavity linewidth, and the new linewidth is 3.5 times wider than the original. When the pump pulse injects carriers, and thus suddenly perturbs the cavity properties after the probe pulse has injected energy into the cavity, we show that the emitted radiation is not simply a superposition of Lorentzians centred at the initial and perturbed cavity frequencies. Under these conditions, a simple model and the experimental results show that the power spectrum of radiation emitted by the stored electromagnetic energy when the cavity frequency is perturbed during ring-down consists of a series of coherent oscillations between the original and perturbed cavity frequencies, accompanied by a gradual decrease and broadening of the original cavity line, and the emergence of the new cavity resonance. The modified cavity lifetime is shown to have a significant impact on the evolution of the emission as a function of the pump-probe delay.

© 2007 Optical Society of America

OCIS Codes
(230.5750) Optical devices : Resonators
(270.6570) Quantum optics : Squeezed states
(130.7405) Integrated optics : Wavelength conversion devices

ToC Category:
Optical Devices

Original Manuscript: June 28, 2007
Revised Manuscript: August 14, 2007
Manuscript Accepted: August 15, 2007
Published: August 24, 2007

Murray W. McCutcheon, Andras G. Pattantyus-Abraham, Georg W. Rieger, and Jeff F. Young, "Emission spectrum of electromagnetic energy stored in a dynamically perturbed optical microcavity," Opt. Express 15, 11472-11480 (2007)

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