Optical Nanowire Gratings: An Efficient Single Photon Collector and Refractometer

We propose an optical nanowire grating-based device for efficient single-photon coupling and refractive index sensing. The proposed structure enhances the coupling of photons into the fiber-guided modes using an inline fiber cavity mobilized with a single quantum emitter. The optimized structure has a low mode volume of 0.56 µm
³
and a Q-factor of ~890. The system has a high Purcell factor of 20 and a coupling efficiency of~ 90% to the guided mode from a single quantum emitter. Also, the sensitivity of the sensor is calculated as 84.8 nm/RIU and a high figure of merit of 95.11 RIU
⁻¹
for a range of gaseous analytes. So, we believe that the proposed system can be used in quantum networks as well as in biosensor applications.