SOI-based photonic crystals

Recent progresses of SOI-based 2D photonic crystals have been reviewed. It has been shown that line and point defects in photonic crystals well manipulate photons, and photonic-nanostructure devices can be indeed realized. The progresses of nanocavities with ultrahigh Q factor of 6000000 have also been described. The realization of such ultrahigh Q nanocavities should accelerate developments not only in the field of photonics but also in various other fields including quantum communication and computing, bio and accurate environment monitors.