Tunable Oscillating Fano Spectra in a Fiber Taper Coupled Conical Microresonator

Tunable oscillating Fano spectra are demonstrated theoretically and experimentally in a fiber taper coupled conical microresonator for the first time. The oscillating Fano spectra are the modulated spectra of the resonant fields in the conical microresonator by a complex Fano parameter. Also the oscillating Fano spectra are tunable both on their Fano lineshapes and Fano resonance wavelengths by simply tuning the size of the fiber taper and the conical microresonator. All the experimental results agree well with the theoretical predictions. Such the tunable oscillating spectra can be used for many applications, such as optical signal processing, optical sensing, and optical filtering.