Tunable Fano Resonance in Diamond Cavity Coupled Optical Nanowire

Abstract A fiber inline compatible hybrid diamond cavity system manifesting Fano resonance in transmission, as well as emission spectra, is presented. This system comprises a 1D Bragg cavity structured elliptically faceted diamond nanowire coupled to an optical nanowire. The device exhibits ≈47% transmission variation within a wavelength range ≈522 pm with a moderate Q ‐factor ≈1100. The dual supermode‐based photon coupling enables ≈80% photon coupling efficiency. The tunability of the Fano lineshape and the Purcell factor as high as 223 is attained by altering the dipole position of the quantum emitter. Such significantly high Purcell factor results in ≈150 times reduction in the decay time of quantum emitter emission, thereby allowing faster data transmission. It is believed that the proposed hybrid cavity Fano system may provide a new pathway for quantum optical switches, sensors, and applications at a single photon level.