Optical device having efficient light-matter interface for quantum simulations
An optical device comprising a single-photon device, which is coupled to a planar waveguide is described. The planar waveguide comprises a nanostructured section, which includes a longitudinal extending guiding region with a first side and a second side, a first nanostructure arranged on the first side of the guiding region, and a second nanostructure arranged on the second side of the guiding region. The nanostructured section comprises a slow-mode section, in which the single-photon device is positioned or embedded, and in which the first nanostructure and second nanostructure suppress spontaneous emission into other modes. The planar waveguide further comprises a fiber coupler for coupling light out of the planar waveguide and into an optical fiber, the fiber coupler preferably being adapted to match a field profile of an optical fiber.
1. An optical device comprising:
a single-photon device, which is coupled to a planar waveguide, wherein the planar waveguide comprises a nanostructured section, which includes:
a longitudinal extending guiding region with a first side and a second side,
a first nanostructure arranged on the first side of the guiding region, and
a second nanostructure arranged on the second side of the guiding region,
wherein the nanostructured section comprises a slow-mode section, in which the single-photon device is positioned or embedded, and in which the first nanostructure and second nanostructure suppress spontaneous emission into other modes,
wherein the planar waveguide further comprises: a fibre coupler for coupling light out of the planar waveguide and into an optical fibre.
2. An optical device according to claim 1 , wherein the planar waveguide further comprises a fast-mode section arranged after the slow-mode section.
3. An optical device according to claim 2 , wherein the fast-mode section is directly coupled to the slow-mode section and wherein the fast-mode section and slow-mode section are impedance matched.
4. An optical device according to claim 1 , wherein the planar waveguide further comprises a slow-to-fast transition section arranged after the slow-mode section providing a transition from slow-mode light to fast-mode light.
5. An optical device according to claim 1 , wherein the fiber coupler comprises and out-of-plane grating-to-fibre coupler having a second width and being adapted to coupling light out of the device and match the field profile of an optical fiber.
6. An optical device according to claim 5 , wherein a pre-grating transition section having a gradual transition from the first width to the second width is arranged between the ridge waveguide and the grating-to-fibre coupler.
7. An optical device according to claim 1 , wherein the planar waveguide includes a ridge waveguide having a first width and arranged so that the fast-mode light from the nano-structured section is coupled into the ridge waveguide.
8. An optical device according to claim 1 , wherein the planar waveguide further comprises a fast-mode section arranged after the slow-mode section, a ridge waveguide arranged after the fast-mode section, and the fibre coupler is arranged after the ridge waveguide.
9. An optical device according to claim 8 , wherein the fiber coupler comprises an out-of-plane grating-to-fiber coupler, and wherein a pre-grating transition section having a gradual transition from a first width of the ridge waveguide to a second width of the out-of-plane grating-to-fiber coupler is arranged between the ridge waveguide and the out-of-plane grating-to-fiber coupler.
10. An optical device according to claim 1 , wherein the optical device is made of an III-V semiconductor material.
11. An optical device according to claim 1 , wherein the optical device is provided on a single substrate.
12. An optical device according to claim 1 , wherein the nanostructured section is a photonic crystal waveguide.
13. An optical device according to claim 1 , wherein the nanostructured section comprises a termination at a proximal longitudinal end of the slow-mode section.
14. An optical device according to claim 1 , wherein the first nanostructure and the second nanostructure in the fast-mode section is stretched in the longitudinal direction so that a mutual longitudinal distance between holes of the nanostructures in the fast-mode section is at least 2% larger than the mutual longitudinal distance in the slow-mode section.
15. An optical device according to claim 1 , wherein the single-photon device is a single-photon emitter.
16. An optical device according to claim 1 , wherein the single-photon device is a quantum dot, a nanowire or a super-conducting wire.
17. An optical device according to claim 1 , wherein the out-of-plane grating-to-fiber coupler comprises surface gratings.
18. An optical device according to claim 1 , further comprising an optical fiber having a first end arranged so as to be able to couple in light from the out-of-[plane grating-to-fibre coupler, alternatively couple light emitted from the first end into the out-of-plane grating-to-fiber coupler.
19. An optical fiber according to claim 18 , wherein the optical fiber is a single-mode fiber.
20. An optical device according to claim 18 , wherein the optical device is further coupled to a demultiplexing setup using a pockels cell.
21. An optical device according to claim 20 , wherein the pockels cell is arranged in a loop.
22. An optical device according to claim 20 , wherein parallel trains of single photons are demultiplexed into individual optical fibers.