Room-temperature emission at telecom wavelengths from silicon photonic crystal nanocavities

R. Lo Savio*, S. L. Portalupi, D. Gerace, A. Shakoor, T. F. Krauss, L. O'Faolain, L. C. Andreani, M. Galli

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Strongly enhanced light emission at wavelengths between 1.3 and 1.6 μm is reported at room temperature in silicon photonic crystal (PhC) nanocavities with optimized out-coupling efficiency. Sharp peaks corresponding to the resonant modes of PhC nanocavities dominate the broad sub-bandgap emission from optically active defects in the crystalline Si membrane. We measure a 300-fold enhancement of the emission from the PhC nanocavity due to a combination of far-field enhancement and the Purcell effect. The cavity enhanced emission has a very weak temperature dependence, namely less than a factor of 2 reduction between 10 K and room temperature, which makes this approach suitable for the realization of efficient light sources as well as providing a quick and easy tool for the broadband optical characterization of silicon-on-insulator nanostructures.
Original languageEnglish
Article number201106
Number of pages3
JournalApplied Physics Letters
Volume98
Issue number20
DOIs
Publication statusPublished - May 2011

Keywords

  • Photonic crystals
  • Photoluminescence
  • Silicon
  • Nonlinear acoustics
  • Purcell effect
  • Activation energies

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