We show that ultrahigh-Q wavelength-sized cavities can be reconfigurably formed by local refractive index tuning of photonic-crystal mode-gap waveguides. We have found that Q can be extraordinarily high (approximately 5 x 10(9)), which is much higher than that of structure-modulated mode-gap cavities. Furthermore, the required index modulation is extremely small (Deltan/n approximately 10(-3)), which enables dynamic cavity formation by fast optical nonlinearity. We numerically show that traveling photons in a waveguide can be pinned by fast local index tuning.
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Notomi et al. (2008) studied this question.
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