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Fast quantum dot single photon source triggered at telecommunications wavelength
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View: Figures


Image of FIG. 1.
FIG. 1.

Photonic crystal cavity design and fabrication. (a) SEM image of fabricated suspended membrane photonic crystal cavity. Scale bar indicates . (b) Reflectivity measurement of fundamental cavity mode. Lorentzian fit gives Q of 7000. (c) (i) and (ii) simulated electric field components for fundamental mode of L3 photonic crystal cavity, used for resonantly enhanced upconversion. (d) (i) and (ii) electric field patterns for TE mode closest to emission frequency of quantum dot. The low Q mode is formed through weak confinement of an air-band mode.

Image of FIG. 2.
FIG. 2.

Characterization of single quantum dot excited with on-chip-upconverted 1500 nm laser. (a) Spectrum measured from CW second harmonic excitation of quantum dot. Inset: Streak camera measurement of quantum dot lifetime. Counts were summed over spectral window indicated by box. (b) Photon correlation measurement of quantum dot emission under frequency doubled CW 1550 nm excitation. Fit gives .

Image of FIG. 3.
FIG. 3.

Photon correlation measurement of quantum dot emission when triggered with frequency doubled telecom wavelength laser pulses from an externally modulated telecom wavelength laser. (a) Second order autocorrelation function measurement for 100 MHz repetition rate with duty cycle 20%. indicates emission from a single quantum dot. (b) Second order autocorrelation measurement for repetition rate 300 MHz with duty cycle 50% and .


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Scitation: Fast quantum dot single photon source triggered at telecommunications wavelength