Guided light source for emission of single photons
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsKarim Hassan, Salim Boutami
Life of this patent
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Abstract
A guided light source that comprises: at least one quantum box associated with a discoid wave guide to achieve cylindrical propagation of a wave front emitted by the at least one quantum box in the discoid wave guide; an annular wave guide surrounding the discoid wave guide and having a grating coupler formed on its internal periphery to receive the wave front in normal incidence; an output wave guide optically coupled to the annular wave guide, in which the wave front is guided. The invention includes the method of fabrication of such a source, and its use for emission of a sequence of single photons.
Claims14
A guided light source, comprising:
- at least one quantum box associated with a discoid wave guide to achieve cylindrical propagation of a wave front emitted by the at least one quantum box in the discoid wave guide;
- an annular wave guide surrounding said discoid wave guide, having a grating coupler formed on its internal periphery to receive said wave front in normal incidence and being open at two coupling ends;
- an output wave guide optically coupled to the annular wave guide;
- and
- a coupler having a first side connected to the two coupling ends of the annular wave guide and a second side connected to the output wave guide, said coupler being configured to combine a beam circulating in the annular wave guide in a propagation mode and a beam circulating in the annular wave guide in a counter-propagation mode into a single beam circulating in the output wave guide.
A method of fabrication of a guided light source, comprising:
- forming a discoid wave guide, an annular wave guide surrounding the discoid wave guide and being open at two coupling ends and an output wave guide optically coupled to the annular wave guide;
- positioning at least one quantum box with respect to the discoid wave guide to achieve cylindrical propagation of a wave front emitted by the at least one quantum box in the discoid wave guide;
- forming a grating coupler on an internal periphery of the annular wave guide to receive said wave front in normal incidence;
- and
- forming a coupler having a first side connected to the two coupling ends of the annular wave guide and a second side connected to the output wave guide, said coupler being configured to combine a beam circulating in the annular wave guide in a propagation mode and a beam circulating in the annular wave guide in a counter-propagation mode into a single beam circulating in the output wave guide.
Dependencies are inferred from the claim text.