Ultra-low power generation of twin photons in a compact silicon ring resonator

Azzini, Stefano and Grassani, Davide and Strain, Michael J. and Sorel, Marc and Helt, L. G. and Sipe, J. E. and Liscidini, Marco and Galli, Matteo and Bajoni, Daniele (2012) Ultra-low power generation of twin photons in a compact silicon ring resonator. Optics Express, 20 (21). pp. 23100-23107.

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Abstract

We demonstrate efficient generation of correlated photon pairs by spontaneous four wave mixing in a 5 μm radius silicon ring resonator in the telecom band around 1550 nm. By optically pumping our device with a 200 μW continuous wave laser, we obtain a pair generation rate of 0.2 MHz and demonstrate photon time correlations with a coincidence-to-accidental ratio as high as 250. The results are in good agreement with theoretical predictions and show the potential of silicon micro-ring resonators as room temperature sources for integrated quantum optics applications.