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A report is presented, for the first time, on the observation of optical resonance modes in free-standing InGaAs/GaAs quantum dot microtubes at room temperature. The three-dimensionally confined optical modes, with wavelengths in the range of 1.1-1.3 mum and an intrinsic Q-factor of -2000, are directly related to the microtube surface geometry and, consequently, can be precisely engineered by varying...
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