Liquid modulated ultra-high performance photonic crystal fiber devices with simple structure

Abstract

In this paper, a liquid-modulated ultra-high performance photonic crystal optical fiber device is proposed with a simple structure, and the finite element method is used to study its filtering and sensing characteristics. When two larger pores are filled with alcohol with a refractive index of n = 1.33, the unwanted optical fiber loss can reach 3044dB/cm, and when the optical fiber length is 3 mm, its crosstalk reaches 7911 dB, which may be one of the best fiber polarization filters at present. What’s more, the liquid-modulated SPR fiber can also be used as a sensor, when the refractive index of the filled alcohol is between 1.31 and 1.35, its average refractive index sensing sensitivity is 2345 nm/RIU, and the highest sensing can reach 4000nm/RIU, which can be used for chemical, food, medical testing, with the advantages of small size and corrosion resistance.