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12 November 2005 Controlling the spontaneous emission rate of single quantum dots in a 2D photonic crystal
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We report on single photon sources produced from photonic crystal - coupled InAs Quantum Dots (QDs). We observe large spontaneous emission rate modification of individual InAs Quantum Dots (QDs) in modified single defect cavities with large quality factor (Q). Compared to QDs in bulk semiconductor, QDs that are resonant with the cavity show an emission rate increase by up to a factor of 8. In contrast, off-resonant QDs indicate up to five-fold rate quenching as the local density of optical states (LDOS) is diminished in the photonic crystal. In both cases we demonstrate photon antibunching, showing that the structure represents an on-demand single photon source with pulse duration from 210 ps to 8 ns. We explain the suppression of QD emission rate using Finite Difference Time Domain (FDTD) simulations and find good agreement with experiment. High multiphoton suppression is achieved by resonant excitation. Finally, we discuss fabrication improvements based on FDTD analysis of already fabricated structures.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dirk Englund, David Fattal, Edo Waks, Yoshihisa Yamamoto, and Jelena Vuckovic "Controlling the spontaneous emission rate of single quantum dots in a 2D photonic crystal", Proc. SPIE 6003, Nanostructure Integration Techniques for Manufacturable Devices, Circuits, and Systems: Interfaces, Interconnects, and Nanosystems, 60030C (12 November 2005);


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