Preparation and application of microfiber resonant ring sensors: A review

Due to its advantages of strong evanescent field, optical limiting, easily integrating with common single-mode fiber, the micro-nano optical fiber has gotten a worldwide attention in recent years. The sensing technology based on microfiber resonant ring has the advantages of anti-interference, quick response, high resolution, small size and stable measurement, which enable its potential applications in the food industry, manufacturing and environment monitoring to determine the temperature, humidity, refractive index, and current. In this paper, the developments and applications of the microfiber resonant ring sensors were reviewed from three aspects: the manufacture methods for different types of microfiber resonance ring were summarized; the applications were described and analyzed in detail; the possible research content in future was prospected.