Purcell-Enhanced Single-Photon Emission in the Telecom C-Band

Abstract

Purcell-enhanced quantum dot single-photon emission in the telecom C-band from InAs quantum dots inside circular Bragg grating cavities is shown. The InAs quantum dots are grown by means of molecular beam epitaxy on an InP substrate and are embedded into a quaternary ${\mathrm{In}}_{0.53}{\mathrm{Al}}_{0.23}{\mathrm{Ga}}_{0.24}\mathrm{As}$ membrane structure. In a post-growth flip-chip process with subsequent substrate removal and electron beam-lithography, circular Bragg grating ("bullseye") resonators are defined. Micro-photoluminescence studies of the devices at cryogenic temperatures of T = 5 K reveal individual quantum dot emission lines into a pronounced cavity mode. Time-correlated single-photon counting measurements under above-band gap excitation yield Purcell-enhanced excitonic decay times of $\tau =(180\pm 3)$ ps corresponding to a Purcell factor of $F_P=(6.7\pm 0.6)$. Pronounced photon antibunching with a background limited $g^{(2)}(0)=(0.057\pm 0.004)$ is observed, which demonstrates that the light originated mostly from one single quantum dot.

arXiv comment8 pages, 5 figures

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Cited by in corpus (6)

• High Purcell-enhancement in quantum-dot hybrid circular Bragg grating cavities for GHz-clockrate generation of indistinguishable photons
• Spin-photon entanglement with direct photon emission in the telecom C-band
• Strain-free GaSb quantum dots as single-photon sources in the telecom S-band
• Two-Photon Interference from an InAs Quantum Dot emitting in the Telecom C-Band
• Stark Tuning and Charge State Control in Individual Telecom C-Band Quantum Dots
• Purcell-enhanced lifetime modulation of quantum emitters as a probe of local refractive index changes