Bright single-photon source in a silicon chip by nanoscale positioning of a color center in a microcavity

• URL: http://arxiv.org/abs/2501.12744v1
• Date: Wed, 22 Jan 2025 09:25:29 GMT
• Title: Bright single-photon source in a silicon chip by nanoscale positioning of a color center in a microcavity
• Authors: Baptiste Lefaucher, Yoann Baron, Jean-Baptiste Jager, Vincent Calvo, Christian Elsässer, Giuliano Coppola, Frédéric Mazen, Sébastien Kerdilès, Félix Cache, Anaïs Dréau, Jean-Michel Gérard,
• Abstract summary: We present an all-silicon source of near-infrared linearly-polarized single photons fabricated by nanoscale positioning of a color center in a silicon-on-insulator microcavity. Results represent a major step towards on-demand sources of indistinguishable near-infrared single photons within silicon photonics chips.
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• Abstract: We present an all-silicon source of near-infrared linearly-polarized single photons, fabricated by nanoscale positioning of a color center in a silicon-on-insulator microcavity. The color center consists of a single W center, created at a well-defined position by Si$^{+}$ ion implantation through a 150 nm-diameter nanohole in a mask. A circular Bragg grating cavity resonant with the W's zero-phonon line at 1217 nm is fabricated at the same location as the nanohole. Under above-gap continuous-wave excitation, a very clean photon antibunching behavior ($g{^2} \leq 0.06$) is observed over the entire power range, which highlights the absence of parasitic emitters. Purcell-enhancement of W's zero-phonon emission provides both a record-high photoluminescence count rate among Si color centers (ca $1.2 \times 10^{6}$ counts/s) and apparent Debye-Waller factor around 99%. We also demonstrate the triggered emission of single photons with 93% purity under weak pulsed laser excitation. At high pulsed laser power, we reveal a detrimental effect of repumping processes, that could be mitigated using selective pumping schemes in the future. These results represent a major step towards on-demand sources of indistinguishable near-infrared single photons within silicon photonics chips.

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