Identification of competing ultrafast all-optical switching mechanisms in Si woodpile photonic crystals

Abstract

We present a systematic study of ultrafast all-optical switching of Si photonic band gap woodpile crystals using broadband tunable nondegenerate pump-probe spectroscopy. At pump-probe coincidence, we investigate the behavior the differential reflectivity at the blue edge of the stopband for a wide range of pump- and probe frequencies. Both dispersive and absorptive features are observed from the probe spectra at coincidence. As the pump frequency is tuned through half the electronic bandgap of Si, the magnitude of both these features increases. For the first time we unambiguously identify this dispersive effect with the electronic Kerr effect in photonic crystals, and attribute the the absorptive features to nondegenerate two photon absorption. The dispersive and absorptive nonlinear coefficients are extracted, and are found to agree well with literature. Finally, we propose a nondegenerate figure of merit (NFOM), which defines the quality of switching for all nondegenerate optical switching processes.

arXiv commentAccepted by JOSA B

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Cited by in corpus (6)

• Ultimate fast optical switching of a planar microcavity in the telecom wavelength range
• All-optical switching of dark states in nonlinear coupled microring resonators
• Competition between electronic Kerr and free carrier effects in an ultimate-fast optically switched semiconductor microcavity
• Observation of a stronger-than-adiabatic change of light trapped in an ultrafast switched GaAs-AlAs microcavity
• Broadband sensitive pump-probe setup for ultrafast optical switching of photonic nanostructures and semiconductors
• Optimal all-optical switching of a microcavity resonance in the telecom range using the electronic Kerr effect