Modified photonic crystal unit-cell resonators containing self-organized In0.65Ga0.35As/GaAs quantum dots are fabricated and characterized. Especially, the tunability of the resonant frequencies as a function of the nearest air holes, the outer air hole, and the lattice constants are investigated in detail by comparing experimental data with three-dimensional finite-difference time-domain calculations. The experimental Q is found to be more than 2000 for a monopole mode and a quadrupole mode. (C) 2005 American Vacuum Society.