Photonics Research, Volume. 9, Issue 11, 2237(2021)
Submegahertz spectral width photon pair source based on fused silica microspheres Editors' Pick
Fig. 1. (a) Schematic of an SFWM photon pair source based on a fused silica microsphere, evanescently coupled to a fiber taper placed in closed proximity; (b) transverse mode of propagation around the sphere perimeter; (c) top view of the guided mode.
Fig. 2. (a) and (b) Density plots of the phase-matching function
Fig. 3. (a) FSR versus optical frequency, calculated from Eq. (
Fig. 4. For a microsphere with radius
Fig. 5. This figure clarifies the structure of the two-photon state produced by SFWM in a microsphere device, in regions similar to those defined in Fig.
Fig. 6. In this figure, we show the behavior of the idler-photon SI
Fig. 7. In panels (a)–(c) of this figure, we show plots of the TED function
Fig. 8. (a) Experimental setup. LC, laser controller; DWDM, dense wavelength division multiplexing device; EDFA, erbium-doped fiber amplifier; PC, polarization controller; TF, tapered fiber; MS, microsphere; CWDM, coarse wavelength division multiplexing device; MC, grating-based monochromator; ID230, free-running InGaAs APD; ID800, time-to-digital converter. Note that in some of the subsequent figures we have provided a setup sketch to show variations on the setup shown in this figure. (b) Close-up showing the fiber taper-microsphere system; (c) schematic of source operation and data obtained in our measurements.
Fig. 9. Experimentally obtained normalized transmittance reduction versus
Fig. 10. (a) Sketch of the experimental setup used for the characterization of the signal-idler SFWM spectrum; (b) SFWM spectrum, composed of pairs of energy-conserving peaks, also showing regions colored red, green, and blue, indicating each of three relevant CWDM channels. We have included the measured transmission curves for these three CWDM channels. (c) For the signal photon, i.e., corresponding to
Fig. 11. (a) Sketch of the setup used for the results shown in (b) and (c); (b) isolation of tallest pair of energy-conserving peaks from Fig.
Fig. 12. For a microsphere with
Fig. 13. For a microsphere with
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Erasto Ortiz-Ricardo, Cesar Bertoni-Ocampo, Mónica Maldonado-Terrón, Arturo Garcia Zurita, Roberto Ramirez-Alarcon, Hector Cruz Ramirez, R. Castro-Beltrán, Alfred B. U’Ren. Submegahertz spectral width photon pair source based on fused silica microspheres[J]. Photonics Research, 2021, 9(11): 2237
Category: Quantum Optics
Received: Jun. 30, 2021
Accepted: Sep. 1, 2021
Published Online: Oct. 19, 2021
The Author Email: Alfred B. U’Ren (alfred.uren@correo.nucleares.unam.mx)