Femtosecond laser assisted selective infiltration of dual-core photonic crystal fiber

Selective infiltration of air holes in photonic crystal fibers (PCFs) with functional materials can equip optical fiber devices with advanced functions. We propose a new method which enables precise selective infiltration of dual-core PCF (DC-PCF) by using femtosecond laser micromachining. Through this proposed technique, we have successfully selective infiltrated single air hole with a diameter of 2.5μm inside a DC-PCF. This method is simple, precise and repeatable, and it provides great potential for fabricating advanced fiber devices using selective infiltration technique.