Optically detected microwave resonance at 95 GHz of exciton states in InAs/GaAs quantum dots

We report about the first observation of optically detected microwave reson ance spectra of MBE-grown InAs/GaAs quantum dots (QD). The signal is detect ed via modulation of the total intensity of the QD emission induced by W-ba nd (95 GHz) microwave excitation. Optically detected magnetic resonance (OD MR) lines are observed at higher fields when the static field is either par allel or perpendicular to the growth direction, with hole g-values \g(h,\\) \ =3 9 and \g(h,perpendicular to)\ = 3.0, respectively. These broad ODMR li nes are tentatively attributed to hole spin transitions. A strongly anisotr opic low-field transition is ascribed to cyclotron resonance (CR), correspo nding to an effective mass of 0.059 m(0).