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Published July 10, 2009 | public
Journal Article

Purcell-Factor-Enhanced Scattering from Si Nanocrystals in an Optical Microcavity


Scattering processes in an optical microcavity are investigated for the case of silicon nanocrystals embedded in an ultra-high-Q toroid microcavity. Using a novel measurement technique based on the observable mode splitting, we demonstrate that light scattering is highly preferential: more than 99.8% of the photon flux is scattered into the original doubly degenerate cavity modes. The large capture efficiency is shown to result from the Purcell enhancement of the optical density of states over the free space value, an effect that is more typically associated with spontaneous emission. The experimentally determined Purcell factor has a lower bound of 171.

Additional Information

©2009 The American Physical Society. Received 17 February 2009; published 10 July 2009. We thank Professor S. Roorda for ion implantation. This work was funded by the DARPA and the Alexander von Humboldt Foundation. The Dutch part of this work is part of the research program of FOM. T. J. K. acknowlegdes support by the Nanosystems Initiatitve Munich (NIM) and the Max Planck Society. 78.67.Bf Optical properties of nanocrystals and nanoparticles 42.60.Da Laser resonators, cavities, amplifiers, arrays, and rings 42.65.Yj Optical parametric oscillators and amplifiers 42.81.Qb Fiber waveguides, couplers, and arrays

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