Cavity QED of GaAs quantum double rings

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To give a definite experimental proof of the cavity QED (quantum electrodynamics) effect of GaAs nano particles, we performed self-assembly of nano particles, fabrication of photonic crystal microcavities, characterization by micro spectroscopy, theoretical analysis of electronic states and electromagnetic modes, and studies on relevant applications. We proved the Purcell effect, or acceleration of photon emission, for GaAs nano particles embedded in photonic crystal microcavities with lattice constants around 200 nm. We also achieved high crystal quality by improvement of the self-assembling technique, so we succeeded for the first time in lasing by current injection with GaAs nano particles. In addition, we clearly demonstrated doubly enhanced spontaneous emission due to the small group velocity of photon at photonic band edges.