Submicrometer diameter micropillar cavities with high quality factor and ultrasmall mode volume

We theoretically demonstrate high quality factor (Q similar to 3 x 10(6)) micropillar cavities with a record low mode volume [V similar to 0.1(lambda/n)(3)] based on the TiO(2)/SiO(2) material system. The proposed cavities have Q/V that is 3 orders of magnitude larger than previously reported ones. We show that our cavity embedded with a diamond nanocrystal provides a feasible platform for cavity quantum electrodynamics experiments in the strong coupling limit. (C) 2009 Optical Society of America